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Influence of heat treatment on the microstructure and mechanical properties of DZ951 alloy 被引量:6
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作者 XIA Pengcheng YU Jingjiang +2 位作者 SUN Xiaofeng GUAN Hengrong hu zhuangqi 《Rare Metals》 SCIE EI CAS CSCD 2008年第2期216-222,共7页
DZ951 directionally solidified nickel-base superalloy is mainly strengthened by γ phase. Regularly aligned cuboidal and bimodal γ precipitates were attained by two heat treatments. The effect of microstructure on th... DZ951 directionally solidified nickel-base superalloy is mainly strengthened by γ phase. Regularly aligned cuboidal and bimodal γ precipitates were attained by two heat treatments. The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to little blocks during aging treatment at 1050℃ (HT1). MC carbide partly degrades into M23C6 and there is a layer of γ around the carbide during aging treatment at 1150℃ (HT2), which is beneficial to the elongation of DZ951 alloy. Small γ volume fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy. HT1 alloy has a better stress rupture life at 1100℃/50 MPa and yield stress at 20℃, 800℃ and 1100℃, which is attributed to regularly aligned cuboidal γ phase and even deformation structure. HT2 alloy has a good combination of strength and ductility. This arises from the bimodal γ precipitates and the degeneration of MC carbide. 展开更多
关键词 DZ951 alloy heat treatment MICROSTRUCTURE mechanical properties
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Wettability of molten Zr_(55)Cu_(30)Al_(10)Ni_5 on alumina and zirconia 被引量:3
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作者 XU Qiangang WU Baoling +1 位作者 ZHANG Haifeng hu zhuangqi 《Rare Metals》 SCIE EI CAS CSCD 2007年第3期213-217,共5页
The wetting behavior of molten Zr55Cu30Al10Ni5 on Al2O3 and ZrO2 was studied using the sessile drop method. The results show that the nonwetting-to-wetting transition for the Zr55Cu30Al10Nis/ZrO2 wetting system takes ... The wetting behavior of molten Zr55Cu30Al10Ni5 on Al2O3 and ZrO2 was studied using the sessile drop method. The results show that the nonwetting-to-wetting transition for the Zr55Cu30Al10Nis/ZrO2 wetting system takes place at 1193 K. The wetting of molten Zr55Cu30Al10Ni5 on Al2O3 is a non-reactive wetting. Owing to the formation of diffusion band at the front of the wetting tip in the Zr55Cu30Al10Ni5/Al2O3 system, the wettability of Al2O3 is better than that of ZrO2. 展开更多
关键词 zircon alloy WETTING interface diffusion band
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Crack growth behavior of SRR99 single crystal superalloy under thermal fatigue 被引量:2
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作者 LIU Yuan YU Jinjiang +3 位作者 XU Yan SUN Xiaofeng GUAN Hengrong hu zhuangqi 《Rare Metals》 SCIE EI CAS CSCD 2008年第5期526-530,共5页
The thermal fatigue behavior of a single crystal superalloy SRR99 was investigated. Specimens with V-type notch were tested at the peak temperatures of 900, 1000, and 1100℃. The crack growth curves as a function of t... The thermal fatigue behavior of a single crystal superalloy SRR99 was investigated. Specimens with V-type notch were tested at the peak temperatures of 900, 1000, and 1100℃. The crack growth curves as a function of the number of cycles were plotted. With the increase of peak temperature, the crack initiation life was shortened dramatically. Through optical microscopy (OM) and scanning electron microscopy (SEM) observation, it was found that multiple small cracks nucleated at the notch tip region but only one or two of them continued to develop in the following thermal cycles. The primary cracks generally propagated along a preferential direction. Microstructure changes after thermal fatigue were also discussed on the basis of SEM observation. 展开更多
关键词 single crystal superalloy thermal fatigue crack growth behavior dendrite orientation
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Effect of γ' formation and strengthening elements on microstructures and stress rupture property of single crystal super-alloys 被引量:2
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作者 Liu Lirong Chen Haijun +3 位作者 Jin Tao Sun Xiaofeng Guan Hengrong hu zhuangqi 《China Foundry》 SCIE CAS 2010年第3期265-269,共5页
An investigation was carried out to study the effects of γ' formation and strengthening elements (Al, Ti and Ta) on the microstructure and stress rupture properties of nickel base single crystal super-alloys.The ... An investigation was carried out to study the effects of γ' formation and strengthening elements (Al, Ti and Ta) on the microstructure and stress rupture properties of nickel base single crystal super-alloys.The results show that with the increase of γ' formation and strengthening elements, the percentage of γ-γ' eutectic and the misfit degree of γ/γ' increases.Detailed microstructural analysis revealed that with the increase of γ' forming element content, the morphology of γ' changed from spherical to cubic, then irregular shape; and the size of γ' increases gradually.Excessive γ' formation and strengthening elements will lead to the precipitation of μ phase during stress rupture tests.The alloy with 5wt.%Al, 1wt.%Ti and 6wt.%Ta has the best stress rupture property. 展开更多
关键词 γ' phase MICROSTRUCTURES stress rupture property single crystal super-alloy
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MICROSTRUCTURE AND COMPRESSIVE PROPERTIES OF NiAl-TiB_2 PARTICULATE COMPOSITES
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作者 XING Zhanping GUO Jianting +1 位作者 hu zhuangqi AN Geying 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1994年第1期45-48,共4页
Ni-50at.%A1 matrix composites containing 0 to 20v.% TiB2 particles have been successfully fabricated by HPES technique. The results show that the Vickers hardness at room temperature and the compressive yield strength... Ni-50at.%A1 matrix composites containing 0 to 20v.% TiB2 particles have been successfully fabricated by HPES technique. The results show that the Vickers hardness at room temperature and the compressive yield strength from room temperature to 1000℃ of the composites increase with increasing volume fraction of the strengthening phase. Especially, the yield strength of NiAl-20TiB2 was approximately twice as high as that of unreinforced NiAl. The ductility of the composites at room temperature is also superior to the monolithic NiAl. 展开更多
关键词 intermetallic matrix composite NIAL TIB2 MICROSTRUCTURE compressive property
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Thermodynamic prediction of the composition of Fe-based amorphous alloys
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作者 REN Yuping ZHANG Haifeng +5 位作者 SUN Wensheng WANG Aimin LI Hong hu zhuangqi HAO Shiming LI Hongxiao 《Rare Metals》 SCIE EI CAS CSCD 2007年第5期504-507,共4页
The liquidus univariant lines of the Fe-Nb-B ternary system have been thermodynamically calculated by means of CALPHAD method and Fe-based thermodynamic data. It is found that there are two eutectic reactions in the F... The liquidus univariant lines of the Fe-Nb-B ternary system have been thermodynamically calculated by means of CALPHAD method and Fe-based thermodynamic data. It is found that there are two eutectic reactions in the Fe-rich corner,that is,(1) L(Fe-3Nb-15B) →α+γ+ M2B (1430 K),and (2) L(Fe-10Nb-27B) → FeB + Lc14 + M2B (1575 K). Moreover,the eutectic points are very close to the compositions with high glass forming ability determined experimentally. This means that it is feasible to design the compositions of multicomponent bulk metallic glasses by looking for the eutectic points in the Fe-Nb-B system by means of thermodynamic calculation. 展开更多
关键词 Fe-Nb-B ternary system amorphous composition prediction thermodynamic calculation eutectic point
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EFFECT OF Ti-ADDITION ON MECHANICAL ALLOYING OF NiAl
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作者 LIU Zhiguang GUO Jianting +1 位作者 LIGusong hu zhuangqi 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1994年第1期7-11,共5页
Mechanical alloying (MA) of Ni50Al45Ti5 (atomic per cent) is studied by in situ thermal analyses, XRD and metallography. The results showed that the alloying process of Ni50Al45Ti5 is similar to that of Ni50Al50. The ... Mechanical alloying (MA) of Ni50Al45Ti5 (atomic per cent) is studied by in situ thermal analyses, XRD and metallography. The results showed that the alloying process of Ni50Al45Ti5 is similar to that of Ni50Al50. The addition of 5 at.%Ti prolongs the milling time of alloy prior to the explosive reaction in the alloy. The final product is nanocrystalline β-phase NiAl(Ti) (B2 structure). The addition of 5 at.% Ti shows little effect on the lattice parameter of β-phase. 展开更多
关键词 mechanical alloying NIAL in situ thermal analysis explosive reaction
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Rapid reductive degradation of azo dyes by a unique structure of amorphous alloys 被引量:12
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作者 ZHANG ChangQin Zhu ZhengWang +1 位作者 ZHANG HaiFeng hu zhuangqi 《Chinese Science Bulletin》 SCIE EI CAS 2011年第36期3988-3992,共5页
An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an or... An Fe-based amorphous alloy was found to significantly enhance the reductive degradation of an azo dye in aqueous solution. The surface-area normalized rate constant was up to 2.0 L m-2 min-1 at room temperature,an order of magnitude larger than any previously reported value. The activation energy of the degradation process was calculated according to the Arrhenius equation,and a much lower value than those previously reported was obtained. Valence band measurement indicated that a depressed valence band maximum and a widened empty band were established in the amorphous ribbon. The unique structure of the amorphous alloy is important-it may reduce the activation energy of the degradation process and enhance the activity of the electrons,thus accelerating the degradation process. 展开更多
关键词 铁基非晶合金 降解过程 偶氮染料 快速还原 Arrhenius方程 结构 退化过程 速率常数
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Effect of Sn addition on the glass-forming ability and mechanical properties of Ni-Nb-Zr bulk metallic glasses 被引量:5
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作者 LI DengKe ZHANG HaiFeng +2 位作者 WANG AiMin Zhu ZhengWang hu zhuangqi 《Chinese Science Bulletin》 SCIE EI CAS 2011年第36期3926-3931,共6页
The effect of tin (Sn) addition on the glass forming ability (GFA) and mechanical properties of the Ni-Nb-Zr ternary alloy system has been studied. The addition of Sn improves the GFA; Ni61Nb35.5-xZr3.5Snx (in at.%) a... The effect of tin (Sn) addition on the glass forming ability (GFA) and mechanical properties of the Ni-Nb-Zr ternary alloy system has been studied. The addition of Sn improves the GFA; Ni61Nb35.5-xZr3.5Snx (in at.%) alloys with x=1 can be cast into amorphous samples at least 3 mm in diameter using a copper mold injection-casting method. The critical size for glass formation decreases to 2 mm when x=5 because Ni2SnZr phase precipitates readily. The addition of Sn is also effective in enhancing the stability of the supercooled liquid; a maximum supercooled liquid region of 48 K was attained for the Ni61Nb30.5Zr3.5Sn5 alloy. Compression tests reveal that the Ni61Nb33.5Zr3.5Sn2 alloy possesses the best mechanical properties,with yield strength~3180 MPa,fracture strength~3390 MPa and plastic strain ~1.3%. The fracture surfaces examined by scanning electron microscopy indicate that the alloys have a transition from ductility to brittleness in fracture behavior. The combination of high GFA,high thermal stability,high strength and compressive plasticity makes these alloys potentially attractive for engineering applications. 展开更多
关键词 大块非晶合金 玻璃形成能力 机械性能 NI NB ZR 扫描电子显微镜
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The influence of Zr substitution for Nb on the corrosion behaviors of the Ni-Nb-Zr bulk metallic glasses 被引量:5
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作者 LI DengKe Zhu ZhengWang +2 位作者 ZHANG HaiFeng WANG AiMin hu zhuangqi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第12期2362-2366,共5页
The influence of Zr content on corrosion behaviors of the Ni61.5Nb 38.5xZrx(x=1,3,5,7,9 at.%) bulk metallic glasses(BMGs) in 1 M HCl aqueous solution was investigated by potentiodynamic polarization measurements and X... The influence of Zr content on corrosion behaviors of the Ni61.5Nb 38.5xZrx(x=1,3,5,7,9 at.%) bulk metallic glasses(BMGs) in 1 M HCl aqueous solution was investigated by potentiodynamic polarization measurements and X-ray photo-electron spectroscopy(XPS).It was found that these BMG alloys possess superior corrosion resistance,that is,with large passive region of about 1.5 V and low passive current density(as low as 0.05 Am-2 for Ni61.5Nb31.5Zr7).XPS analysis indicates that the high corrosion resistance is attributed to the formation of Nb-and Zr-enriched surface films formed in the aggressive acid solution.The Zr substitution for Nb effectively reduces the Ni content,particularly the metallic state Ni content in the surface films,which depresses the electrical conduction of the surface films and reduces the passive current density,thus leading to the enhancement of the corrosion resistance of these Ni-Nb-Zr BMGs.These alloys may potentially be useful for engineering applications. 展开更多
关键词 bulk metallic glasses corrosion resistance X-ray photoelectron spectroscopy
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