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Mechanism and Kinetics of Phase Transformation in Two-phase TiAl-based Alloys 被引量:2
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作者 Shiming HAO+ and Wen tao WU(Dept. of Mater. Sci., Northeastern University, Shenyang, 110006, China)Chuanxi HAN(Northwest Institute for Nonferrous Metal Research, Bao ji, 721014, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1994年第3期170-174,共5页
The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersa... The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersaturated single phase of ordered 22. When the supersaturated phase is aged in the two phase range at 1273 and 1373 K, it will transform to a lamellar microstructure of γ+α2. with a discontinuous decomposition mechanism in Ti-42at-%Al alloy and a semicontinuous decomposition mechanism in T1-45at-%Al alloy. With the methods of quantitative metallograph examination and X-ray diffraction analysis. the relationship between the amount of γ, phase precipitation and the time of isothermal transformation is agreed 展开更多
关键词 TIAL Mechanism and Kinetics of phase transformation in Two-phase tial-based alloys
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A new insight into LPSO phase transformation and mechanical properties uniformity of large-scale Mg-Gd-Y-Zn-Zr alloy prepared by multi-pass friction stir processing 被引量:1
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作者 Xiaohu Guan Wen Wang +7 位作者 Ting Zhang Pai Peng Qiang Liu Peng Han Ke Qiao Jun Cai Liqiang Wang Kuaishe Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第5期2041-2056,共16页
A large-scale fine-grained Mg-Gd-Y-Zn-Zr alloy plate with high strength and ductility was successfully prepared by multi-pass friction stir processing(MFSP)technology in this work.The structure of grains and long peri... A large-scale fine-grained Mg-Gd-Y-Zn-Zr alloy plate with high strength and ductility was successfully prepared by multi-pass friction stir processing(MFSP)technology in this work.The structure of grains and long period stacking ordered(LPSO)phase were characterized,and the mechanical properties uniformity was investigated.Moreover,a quantitative relationship between the microstructure and tensile yield strength was established.The results showed that the grains in the processed zone(PZ)and interfacial zone(IZ)were refined from 50μm to 3μm and 4μm,respectively,and numerous original LPSO phases were broken.In IZ,some block-shaped 18R LPSO phases were transformed into needle-like 14H LPSO phases due to stacking faults and the short-range diffusion of solute atoms.The severe shear deformation in the form of kinetic energy caused profuse stacking fault to be generated and move rapidly,greatly increasing the transformation rate of LPSO phase.After MFSP,the ultimate tensile strength,yield strength and elongation to failure of the large-scale plate were 367 MPa,305 MPa and 18.0% respectively.Grain refinement and LPSO phase strengthening were the major strengthening mechanisms for the MFSP sample.In particularly,the strength of IZ was comparable to that of PZ because the strength contribution of the 14H LPSO phase offsets the lack of grain refinement strengthening in IZ.This result opposes the widely accepted notion that IZ is a weak region in MFSP-prepared large-scale fine-grained plate. 展开更多
关键词 Friction stir processing MULTI-PASS Mg-Gd-Y-Zn-Zr alloy LPSO phase transformation Mechanical properties
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Influence of cooling rate on phase transformation and microstructure of Ti-50.9%Ni shape memory alloy 被引量:4
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作者 张艳秋 江树勇 +1 位作者 赵亚楠 唐明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2685-2690,共6页
Heat treatment of Ti-50.9%Ni (mole fraction) alloy was studied by differential scanning calorimetry, X-ray diffraction, scanning electron microscopey and energy dispersive X-ray analysis to investigate the influence... Heat treatment of Ti-50.9%Ni (mole fraction) alloy was studied by differential scanning calorimetry, X-ray diffraction, scanning electron microscopey and energy dispersive X-ray analysis to investigate the influence of cooling rate on transformation behavior and microstructures of NiTi shape memory alloy. The experimental results show that three-stage phase transformation can be induced at a very low cooling rate such as cooling in furnace. The cooling rate also has a great influence on the phase transformation temperatures. Both martensitic start transformation temperature (Ms) and martensitic finish transformation temperature (Mf) decrease with the decrease of the cooling rate, and decreasing the cooling rate contributes to enhancing the M→A austenite transformation temperature. The phase transformation hysteresis (Af-Mf) increases with the decrease of the cooling rate. Heat treatment is unable to eliminate the textures formed in hot working of NiTi sample, but can weaken the intensity of them. The cooling rate has little influence on the grain size. 展开更多
关键词 NiTi alloy shape memory alloy phase transformation cooling rate martensitic transformation temperature austenite transformation temperature
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In situ study of phase transformations in Ti-6Al-4V-x H alloys 被引量:1
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作者 宗影影 黄树晖 +1 位作者 郭斌 单德彬 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期2901-2911,共11页
The hydrogen-induced microstructure evolution and phase transformations in Ti-6Al-4V alloy during heating and cooling were studied.The specimens were heated to 1273 K and subsequently cooled to room temperature.The hy... The hydrogen-induced microstructure evolution and phase transformations in Ti-6Al-4V alloy during heating and cooling were studied.The specimens were heated to 1273 K and subsequently cooled to room temperature.The hydrogen content is up to 0.8%(mass fraction).The hydrogen-induced dynamic phase transformations and the corresponding mechanisms were analyzed.When the hydrogen content increases,the β transus temperature significantly decreases and the magnitude decreases,and the volume fraction of β phase increases.During heating,the phase transformations in hydrogenated Ti-6Al-4V alloys can be divided into three stages,and the phase transformation order is δ→α+H2↑?δ+α′→βH?α′→αH+βH?αH→α+H2↑?α→β?βH→β+H2↑.In addition,the relationship among hydrogenation and Ms and Mf of α′ martensite were determined. 展开更多
关键词 titanium alloy phase transformation HYDROGEN in situ
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Effects of high-pressure heat treatment on the solid-state phase transformation and microstructures of Cu_(61.13)Zn_(33.94)Al_(4.93) alloys 被引量:7
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作者 王海燕 刘建华 +1 位作者 彭桂荣 王文魁 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第9期469-474,共6页
The phase transformation activation energy of the Cu61.13Zn33.94A14.93 alloys, which were treated at 4 GPa and 700 ℃ for 15 minutes, was calculated by means of differential scanning calorimetry curves obtained at var... The phase transformation activation energy of the Cu61.13Zn33.94A14.93 alloys, which were treated at 4 GPa and 700 ℃ for 15 minutes, was calculated by means of differential scanning calorimetry curves obtained at various heating and cooling rates. Then, the effects of high-pressure heat treatments on the solid-state phase transformation and the microstructures of Cu61.13Zn33.94A14.93 alloys were investigated. The results show that high-pressure heat treatments can refine the grains and can change the preferred orientation from (111) to (200) of α phase. Compared with the as-cast alloy, the sample with high-pressure heat treatment has finer grains, lower β'→β and/β→β' transformation temperature and activation energy. Furthermore, we found that high cooling rate favours the formation of fine needle-like α phase in the range of 5-20℃/min. 展开更多
关键词 Cu61.13Zn33.94A14.93 alloy high-pressure heat treatment solid-state phase transformation MICROSTRUCTURES
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Effects of Sm on Phase Transformation in Ni-Mn-Ga Alloys 被引量:2
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作者 郭世海 张羊换 +3 位作者 赵增祺 祁焱 全白云 王新林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2004年第6期875-877,共3页
The effects of small amount additions of Sm on the martensitic transition and magnetic phase transition of polycrystalline Ni-Mn-Ga alloys were investigated. The experimental results show that the Sm doped alloys also... The effects of small amount additions of Sm on the martensitic transition and magnetic phase transition of polycrystalline Ni-Mn-Ga alloys were investigated. The experimental results show that the Sm doped alloys also undergo a thermal-elastic martensitic transformation and reverse transformation during cooling and heating process and the addition of Sm decreases the martensitic transformation temperature and Curie temperature in different degree respectively. Ni-Mn-Ga alloys of adding Sm still possess Heusler structure, but their crystal lattice parameters are modified slightly. The addition of a proper amount of Sm does not basically decrease T_c of the alloy when avoiding the appearance of second phase. In addition, the doped alloys have favorable toughness because of grain refinement of Sm. 展开更多
关键词 Ni-Mn-Ga alloy shape memory alloy martensitic transformation ferromagnetic phase transformation rare earths
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ON THE ORDERING TRANSFORMATIONS IN Ti_3AL-Nb ALLOY
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作者 LI Dong ZHOU Jing CHANG Xin GUAN Shaoxuan Institute of Metal Research,Academia Sinica,Shenyang,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1991年第3期204-208,共5页
Study was made of the behaviour of ordering transformation in Ti_3AI-Nb alloy,including the ordering at high temperatures,the transformation of high temperature β-phase during cooling,and the decomposition of metasta... Study was made of the behaviour of ordering transformation in Ti_3AI-Nb alloy,including the ordering at high temperatures,the transformation of high temperature β-phase during cooling,and the decomposition of metastable β-phase during aging.The results show that the ordered primary α_2 and high temperature β in alloy form at 1060℃.The transformation of high temperature β-phase proceed by β→α_2+ω type during cooling,and the decomposition of metastable β and ω type proceeded by(β+ω)_(metustabte)→(α_2+β)_(stable)during aging at 700℃. 展开更多
关键词 Ti_3Al-Nb alloy ordering transformation α_2-phase β-phase ω-phase
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Creep Induced Phase Transformation in Extruded Zn-Al Alloy 被引量:1
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作者 Y.H.ZHU and J.Juarez Islas(Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Apartado P.70-360,Mexico D.F.04510, Mexico)E. Orozco(Instituto de Fisica, Universidad Autonoma de Mexico, Apartado P.20-364, Mexico D.F.04510, 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1997年第6期503-507,共5页
Phase transformation and microstructural change of an extruded eutectoid Zn-Al alloy Zn76Al22Cu2 (wt pct) were investigated during creep testing by using SEM and X-ray diffraction techniques. Creep induced decompositi... Phase transformation and microstructural change of an extruded eutectoid Zn-Al alloy Zn76Al22Cu2 (wt pct) were investigated during creep testing by using SEM and X-ray diffraction techniques. Creep induced decomposition of a metastable η'T phase and a four phase transformation, α+ ε →T' +η, occurred during the creep testing. Also a microstructural change was observed from a lamellar structure into a spheroidized structure in the rupture part of the extruded alloy. It provided evidence of creep induced phase transformations which occurred in ageing process. The mechanism of creep rupture of the extruded Zn-Al alloy was also discussed. 展开更多
关键词 AL ZN Creep Induced phase transformation in Extruded Zn-Al alloy
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Effect of Deformation on Order-Disorder Phase Transformation in Cu-Zn Alloy
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作者 张瑞军 徐亮 刘建华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期176-178,共3页
The phase transformation temperature of ordered β′ to disordered β in the Cu-Zn alloy was tested by DSC. The transformation activation energy was calculated and the effect of deformation of the phase transformation... The phase transformation temperature of ordered β′ to disordered β in the Cu-Zn alloy was tested by DSC. The transformation activation energy was calculated and the effect of deformation of the phase transformation was discussed. The results show that the phase transformation temperature and activation energy of ordered β′ to disordered β in the Cu-Zn alloy can be decreased going through deformation, and the phase transformation time can be also decreased. As a result, the order-disorder phase transformation occurs more easily. 展开更多
关键词 Cu-Zn alloy phase transformation DEFORMATION rare earths
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Site occupation evolution of alloying elements in L1_2 phase during phase transformation in Ni_(75)Al_(7.5)V_(17.5)
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作者 张明义 刘富 +3 位作者 陈铮 郭红军 岳广全 杨坤 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2439-2443,共5页
Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 was studied using microscopic phase field model. The results demonstrate that the growing proc... Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 was studied using microscopic phase field model. The results demonstrate that the growing process of DO22 phase can be divided into two stages. At the early stage, composition in the centre part of L12 phase almost remains unchanged, and the nucleation and growth of DO22 phase is controlled by the decrease of interface between L12 phases. At the late stage, part of V for growth of DO22 phase is supplied from the centre part of L12 phase and mainly comes from Al sublattice, the excess Ni spared from the decreasing L12 phase migrates into the centre part of L12 phase and occupies the Ni sublattices exclusively, while the excess Al mainly occupies the Al sublattice. At the late stage, the growth of DO22 phase is controlled by the evolution of antisite atoms and ternary additions in the centre part of L12 phase. 展开更多
关键词 nickel based superalloys Ni75Al7.5V17.5 alloy phase transformation micro-phase field grain growth antisite defect
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Site occupation evolution of alloying elements in Ni_3 V phase during phase transformation in Ni_(75)Al_(4.2)V_(20.8)
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作者 张明义 李志刚 +3 位作者 张金玲 张会占 陈铮 张嘉振 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第5期1599-1604,共6页
Based on the microscopic phase-field model, the correlation between site occupation evolution of alloying elements in Ni3V-DO22 phase and growth of Ni3Al-L12 phase was studied during the phase transformation of Ni75Al... Based on the microscopic phase-field model, the correlation between site occupation evolution of alloying elements in Ni3V-DO22 phase and growth of Ni3Al-L12 phase was studied during the phase transformation of Ni75Al4.2V20.8. The results demonstrate that the growth of L12 phase can be divided into two stages: at the early stage, the composition of alloying elements in DO22 phase almost remains unchanged; at the late stage, the compositions of Ni and Al decrease while V increases in DO22 phase. Part of alloying elements for L12 phase growth are supplied from the site occupation evolution of alloying elements on three kinds of sublattices in DO22 phase. Ni is mainly supplied from V sublattice, and part of Al is supplied from NiⅠ and V sites at the centre of DO22 phase. The excessive V from the decreasing DO22 phase migrates into the centre of DO22 phase and mainly occupies V and NiII sites. It is the site occupation evolution of antisite atoms and ternary additions in DO22 phase that controls the growth rate of L12 phase at the late stage. 展开更多
关键词 Ni75Al4.2V20.8 alloy grain growth phase transformation microscopic phase-field antisite defect
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Effect of strain-induced martensitic phase transformation on the formability of nitrogen-alloyed metastable austenitic stainless steels 被引量:1
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作者 ZHANG Wei ZHOU Deqiang 《Baosteel Technical Research》 CAS 2017年第3期18-23,共6页
Strain-induced martensitic phase transformation and its influence on the forrnability of newly developed nitrogen-alloyed metastable austenitic stainless steels were systematically investigated. Yield strength for the... Strain-induced martensitic phase transformation and its influence on the forrnability of newly developed nitrogen-alloyed metastable austenitic stainless steels were systematically investigated. Yield strength for the as- received steels bearing low nickel content was around 300 MPa and their elongation ratios varied from 55.2% to 61.7%. Erichsen numbers of these samples differed from 13.82 to 14.57 mm. Although its Cu content was lower than that of other samples, steel D2 exhibited better plasticity and formability, which was attributed to ~/--,c~' martensitic phase transformation. EBSD, XRD, and magnetism tests showed that increases in deformation ratio gradually increased the α' martensite phase of a sample ,thereby contributing to its strain and inducing the optimal transformation-induced plasticity effect. An Meeo/5o temperature of around 20 ℃, which is close to the deformation temperature,provided the austenite with adequate stability and gradually transformed it into martensite, thereby endowing lean ASS with better formability. 展开更多
关键词 nitrogen-alloyed austenitic stainless steel FORMABILITY martensitic phase transformation STABILITY
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Analysis of phase transformation from austenite to martensite in NiTi alloy strips under uniaxial tension
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作者 谢宇新 张义同 徐家福 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第12期1651-1658,共8页
Phase transformation from austenite to martensite in NiTi alloy strips under the uniaxial tension has been observed in experiments and numerically simulated as a localized deformation. This work presents an analysis u... Phase transformation from austenite to martensite in NiTi alloy strips under the uniaxial tension has been observed in experiments and numerically simulated as a localized deformation. This work presents an analysis using the theory of phase transformation. The jump of deformation gradient across the interface between two phases and the Maxwell relation are considered. Governing equations for the phase transformation are derived. The analysis is reduced to finding the minimum value of the loading at which the governing equations have a unique, real and physically acceptable solution. The equations are solved numerically and it is verified that the unique solution exists definitely. The Maxwell stress, the stresses and strains inside both austenite and martensite phases, and the transformation-front orientation angle are determined to be in reasonably good agreement with experimental observations. 展开更多
关键词 stress-induced phase transformations Maxwell relation NiTi alloy austen-ite MARTENSITE
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Effect of high Pressure on the Solid-State Phase Transformation Microstructure of Cu-Zn Alloy
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作者 刘建华 徐进 +2 位作者 何淼 杨坤 张瑞军 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期185-187,共3页
The solid-state phase transformation microstructure of Cu-Zn alloy under different high pressure were investigated by means of SEM and XRD. The results show that the α phase with smaller grain size, different shape a... The solid-state phase transformation microstructure of Cu-Zn alloy under different high pressure were investigated by means of SEM and XRD. The results show that the α phase with smaller grain size, different shape and random distribution appears in the Cu-Zn alloy, when the solid-state phase transformation generation in the Cu-Zn alloy under 25~750 ℃ and 3~6 GPa high pressure, and the volume fraction of transformation phase decreases with increasing pressure, under high pressure (6 GPa), the changes of microstructure of Cu-Zn alloy is not obvious. In addition, the effect of high pressure on the solid-state phase transformation microstructure of Cu-Zn alloy was discussed. 展开更多
关键词 Cu-Zn alloy high pressure solid-state phase transformation MICROSTRUCTURE rare earths
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HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY
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作者 QIN Guiying YU Xuejie JIN Heng WANG Jingcheng Shanghai Iron and Steel Research Institute,Shanghai,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1992年第4期231-235,共5页
The relationship between structure and hysteresis of phase transformation temperature in NiTi shape memory alloy has been investigated by means of TEM observation,positron an- nihilation and electrical resistivity mea... The relationship between structure and hysteresis of phase transformation temperature in NiTi shape memory alloy has been investigated by means of TEM observation,positron an- nihilation and electrical resistivity measurement.The sequence of hysteresis for the alloy aged under different regimes was found to be:plate martensite>R-phase>tie-like martensite. The reversible displaeement of phase boundaries of these transformations is blocked by the co- herent stress field around Ti_(11)Ni_(14)phase particles.A linear relationship between S paramet- er of positron annihilation and maximum values of temperature hysteresis showed that the mismatch dislocation and elastic stress field established by Ti_(11)Ni_(14)phase precipitation are the main factor to determine the temperature hysteresis of phase transformation in NiTi shape memory alloy. 展开更多
关键词 shape memory alloy hysteresis of phase transformation temperature coherent stress field mismatch dislocation
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SNAP-ACTION PHASE TRANSFORMATION IN TWO-WAY SHAPE MEMORY Ni-Ti ALLOY
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作者 LUO Laizhong ZHANG Jinxiu LIN Guangming Zhongshan University,Guangzhou,510275,China Lecturer,Dept.of Physics and Institute of Material Science,Zhongshan University,Guangzhou,510275,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第5期380-382,共3页
The snap-action behavior of a Ni-Ti alloy disc which is controlled by combination of a nonlinear stress field and temperature has been studied.After treatment for two-way shape memory,all shape memory strain of snap-a... The snap-action behavior of a Ni-Ti alloy disc which is controlled by combination of a nonlinear stress field and temperature has been studied.After treatment for two-way shape memory,all shape memory strain of snap-action finishes abruptly at a certain temperature within an interval of less than 1 ms.The results of resistance measurement and in-situ X-ray diffraction indicate that the snap-action strain is mainly resulted from the snap-action β (?)R transformation. 展开更多
关键词 shape memory alloy two-way shape memory effect snap-action phase transformation
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ISOTHERMAL PHASE TRANSFORMATION IN Au-Si AMORPHOUS ALLOY
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作者 Li Songrui Gao Shigu Gao Xiujuan Central-South University of Technology,Changsha,China in revised form 9 April 1987] 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第8期109-113,共5页
Electric resistivity measurements and X-ray diffraction analysis were performed to study the isothermal phase transformation in amorphous Au-Si ribbons with eutectic composition pre- pared using melt-spinning techniqu... Electric resistivity measurements and X-ray diffraction analysis were performed to study the isothermal phase transformation in amorphous Au-Si ribbons with eutectic composition pre- pared using melt-spinning technique.A series of phase transformations take place spontaneously at room temperature and accelerate at elevated temperatures.Four stages of the transformation from amorphous state to the equilibrium state can be distinguished.Dis- cussion on the structural character of the metastable phases indicates that Hume-Rothery electron compounds and size factor compounds could form during isothermal aging. 展开更多
关键词 Au-Si amorphous alloy isothermal phase transformation
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Tensile Stress Induced Phase Transformations in Zn-Al Alloy
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作者 Y.H.ZHU and J.Juarez Islas (Instituto de Investigaciones en Materiales, UNAM, Apdo.P.70-360, Mexico D.F.04510, Mexico) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1997年第1期45-49,共5页
Both furnace cooled and as-cast eutectoid Zn-Al alloys were investigated under external tensile stress at 100℃. It was observed that the external tensile stress caused decomposition of two metastable phases η'T ... Both furnace cooled and as-cast eutectoid Zn-Al alloys were investigated under external tensile stress at 100℃. It was observed that the external tensile stress caused decomposition of two metastable phases η'T and η'S which derived from both original state of the alloy, and a phase transformation, αf +ε→T' +η, in both furnace cooled and as-cast eutectoid Zn-Al alloys. Also spheroidized structure formed partially during tensile testing. Superplasticity of the alloy has been discussed correlating with the phase transformations and microstructural changes. 展开更多
关键词 ZN AL Tensile Stress Induced phase transformations in Zn-Al alloy
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Microstructure and Stability of Fe_(73.5) Cu_1Nb_3Si_(13.5)B_9 Alloy at Different Stages of Phase Transformation
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作者 Guiyi ZENG, Qixian BA and Hualin ZENG (Northeastern University, Shenyang 110006, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第2期153-154,共2页
The microstructure and the stability of Fe_73.5Cu_1Nb_3Si_13.5B_9 alloy at different stages of phase transformation were investigated through the observation of X-ray difraction and transmission electron microscopy an... The microstructure and the stability of Fe_73.5Cu_1Nb_3Si_13.5B_9 alloy at different stages of phase transformation were investigated through the observation of X-ray difraction and transmission electron microscopy and the measurement of magnetic aftereffect (MAE). It was found that the dependence of the volume fraction of amorphous phase and the MAE in the samples annealed from 450 to 700℃ on the annealing temperature is similar. 展开更多
关键词 B9 alloy at Different Stages of phase transformation Microstructure and Stability of Fe Cu1Nb3Si SI
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Microstructure and Phase Transformation of a Niobium-rich TiAl-based Alloy Containing Boron and Carbon 被引量:3
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作者 Ziyong Chen Xianglin Su +1 位作者 Zhilei Xiang Zuoren Nie 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第5期453-460,共8页
Microstructure and phase transformation of Ti46Al8Nb0.5B0.2C alloy have been investigated.X-ray diffraction (XRD),optical microscopy (OM),scanning electron microscopy (SEM) and transmission electron microscopy ... Microstructure and phase transformation of Ti46Al8Nb0.5B0.2C alloy have been investigated.X-ray diffraction (XRD),optical microscopy (OM),scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that as-cast and hot isostatic pressing (HIP) alloy mainly composed of γ and α 2 phase have fully lamellar microstructure with point-like or ribbon-like TiB 2 distributing in lamellar colony or at grain boundary.The mean size of lamellar colony is about 150 and 450 μm for as-cast and HIP alloy,respectively.The lamellar spacing is about 550 and 600 nm for as-cast and HIP alloy,respectively.It has been found that cooling rates and quenching temperatures have significant effect on phase transformation of Ti46Al8Nb0.5B0.2C alloy.When the alloy is treated at 1380℃ for 1 h and cooled from α domain,water cooling leads to complete α → α 2 transformation,oil cooling leads to predominant α → α 2 and part α → γ m transformation,air cooling leads to α → α + γ p2 →L(α + γ) →L(α 2 + γ) transformation,and furnace cooling leads to α → α + γ p3 →L(α + γ) →L(α 2 + γ) transformation.However,when the alloy is treated at 1400℃ for 1 h and cooled from α domain,water cooling leads to predominant α → α 2 and part α → α + γ p4 → γ m transformation,oil cooling leads to α → α + γ p5 → γ m transformation,air cooling leads to α → α + γ p6 →L(α + γ) →L(α 2 + γ) transformation,and furnace cooling leads to α → α + γ p7 →L(α + γ) →L(α 2 + γ) transformation.Microstructural evolution of the alloy during various heat treatments has been examined and the phase transformation mechanisms have been elucidated.Based on the experimental observation,schematic CCT diagrams for the alloy have been given. 展开更多
关键词 tial-based alloys Heat treatment MICROSTRUCTURE phase transformation
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