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Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms
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作者 H.T.Jeong S.W.Lee W.J.Kim 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期316-331,共16页
The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαph... The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 K.The microstructural refinement of this alloy was achieved by employing high-ratio differential speed rolling.The best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were obtained.During the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 K.Therefore,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and mechanisms.In the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation mechanism.It was concluded that solute drag creep is unlikely to occur.During the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain hardening.Deformation mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests. 展开更多
关键词 Magnesium-lithium alloy superplasticity Severe plastic deformation Grain size Grain growth
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SUPERPLASTICITY IN LARGE-GRAINED Fe_3Al ALLOYS
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作者 LIN Dongliang(T. L. Lin),(SHAN Aidang, CHEN Mingwei Shanghai Jiaotong University, Shanghai 200030, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第Z1期419-429,共11页
The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti, Fe-28Al-4Ti (all composition reported in this paper are in atomic percent) alloys has been investigated by tensile testing.optical microscopy and transmission elec... The superplasticity behavior of Fe-28Al, Fe-28Al-2Ti, Fe-28Al-4Ti (all composition reported in this paper are in atomic percent) alloys has been investigated by tensile testing.optical microscopy and transmission electron mocroscopy.Tensile test were performed at 700 to 900℃ under a strain rate range of about 10-5/s to 10-2/s. Maximum strain rate sensitivity index m was found to be 0.5 and the largest elongation reached 620%. The flow activation energy was measured to be 263kJ/mol for Fe-28Al and 191kJ/ mol for Fe-28Al-2Ti, which are much lower than the creep activation energy generally observed in Fe3Al alloys. After deformation grain size became much finer from about 100 μm to 20-30μm.As combined with TEM observations, we suggested that a continuous recrystallization process took place and superplasticity may arise from this process. 展开更多
关键词 superplasticity Fe_3Al alloy large grains
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Achieving high-strain-rate and low-temperature superplasticity in an ECAP-processed Mg-Y-Er-Zn alloy via Ag addition
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作者 Haoran Wu Jinghua Jiang +5 位作者 Zhenquan Yang Mengjia Li He Huang Ningfei Ge Aibin Ma Huan Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第10期3765-3778,共14页
The effect of adding a small amount of Ag on the microstructure evolution and superplastic properties of Mg-Y-Er-Zn(WEZ612) alloys was systematically studied.The basal texture of the refined WEZ612 alloy produced by e... The effect of adding a small amount of Ag on the microstructure evolution and superplastic properties of Mg-Y-Er-Zn(WEZ612) alloys was systematically studied.The basal texture of the refined WEZ612 alloy produced by equal channel angular pressing was altered to a non-basal structure upon the addition of Ag.Ag addition also refined the grain size and promoted the formation of a large number of nano-14H-long period stacking ordered phases.Using high-resolution transmission electron microscopy,many nano-precipitated phases were detected on the basal plane of the Mg-Y-Er-Zn-1Ag(WEZ612-1Ag) alloy,The nano-precipitated phases on the basal plane improved the thermal stability of the alloy,lowered the deformation activation energy(Q),and improved the stress sensitivity index(m).At 523 K with a strain rate of 10^(-2) s^(-1),the Q value of WEZ612 was higher than that of WEZ612-1Ag(299.14 and 128.5 kJ mol^(-1),respectively).In contrast,the m value of the WEZ612 alloy(0.16) was lower than that of the WEZ612-1Ag alloy(0.46).At 623 K with a tensile rate of 10^(-2) s^(-1),the WEZ612 and WEZ612-1Ag alloys were elongated by 182% and 495%,respectively,with the latter exhibiting high-strain-rate and low-temperature superplasticity.The improved superplasticity of the WEZ612-1Ag alloy is attributed to the nano-precipitated phases,which effectively limit the cavity extension during superplastic deformation. 展开更多
关键词 Magnesium alloys Long period stacking ordered(LPSO) Ag addition Nano-precipitates superplastic behavior
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Microstructural evolution and deformation mechanisms of superplastic aluminium alloys:A review
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作者 Guo-tong ZOU Shi-jie CHEN +3 位作者 Ya-qi XU Bao-kun SHEN Yu-jia ZHANG Ling-ying YE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第10期3069-3092,共24页
Aluminium alloy is one of the earliest and most widely used superplastic materials.The objective of this work is to review the scientific advances in superplastic Al alloys.Particularly,the emphasis is placed on the m... Aluminium alloy is one of the earliest and most widely used superplastic materials.The objective of this work is to review the scientific advances in superplastic Al alloys.Particularly,the emphasis is placed on the microstructural evolution and deformation mechanisms of Al alloys during superplastic deformation.The evolution of grain structure,texture,secondary phase,and cavities during superplastic flow in typical superplastic Al alloys is discussed in detail.The quantitative evaluation of different deformation mechanisms based on the focus ion beam(FIB)-assisted surface study provides new insights into the superplasticity of Al alloys.The main features,such as grain boundary sliding,intragranular dislocation slip,and diffusion creep can be observed intuitively and analyzed quantitatively.This study provides some reference for the research of superplastic deformation mechanism and the development of superplastic Al alloys. 展开更多
关键词 uminium alloys superplasticity superplastic deformation mechanism grain boundary sliding micro-structural evolution
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Predicting grain size-dependent superplastic properties in friction stir processed ZK30 magnesium alloy with machine learning methods
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作者 Farid Bahari-Sambran Fernando Carreno +1 位作者 C.M.Cepeda-Jiménez Alberto Orozco-Caballero 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第5期1931-1943,共13页
The aim of this work is to predict,for the first time,the high temperature flow stress dependency with the grain size and the underlaid deformation mechanism using two machine learning models,random forest(RF)and arti... The aim of this work is to predict,for the first time,the high temperature flow stress dependency with the grain size and the underlaid deformation mechanism using two machine learning models,random forest(RF)and artificial neural network(ANN).With that purpose,a ZK30 magnesium alloy was friction stir processed(FSP)using three different severe conditions to obtain fine grain microstructures(with average grain sizes between 2 and 3μm)prone to extensive superplastic response.The three friction stir processed samples clearly deformed by grain boundary sliding(GBS)deformation mechanism at high temperatures.The maximum elongations to failure,well over 400% at high strain rate of 10^(-2)s^(-1),were reached at 400℃ in the material with coarsest grain size of 2.8μm,and at 300℃ for the finest grain size of 2μm.Nevertheless,the superplastic response decreased at 350℃ and 400℃ due to thermal instabilities and grain coarsening,which makes it difficult to assess the operative deformation mechanism at such temperatures.This work highlights that the machine learning models considered,especially the ANN model with higher accuracy in predicting flow stress values,allow determining adequately the superplastic creep behavior including other possible grain size scenarios. 展开更多
关键词 Machine learning Artificial intelligence Magnesium alloys superplasticity Friction stir processing Grain coarsening
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Superplasticity of AZ31 magnesium alloy prepared by friction stir processing 被引量:11
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作者 张大童 熊峰 +2 位作者 张卫文 邱诚 张文 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期1911-1916,共6页
Microstructure and tensile behaviors of AZ31 magnesium alloy prepared by friction stir processing(FSP) were investigated.The results show that microstructure of the AZ31 hot-rolled plate with an average grain size o... Microstructure and tensile behaviors of AZ31 magnesium alloy prepared by friction stir processing(FSP) were investigated.The results show that microstructure of the AZ31 hot-rolled plate with an average grain size of 92.0 μm is refined to 11.4 μm after FSP.The FSP AZ31 alloy exhibits excellent plasticity at elevated temperature,with an elongation to failure of 1050% at 723 K and a strain rate of 5×10-4 s-1.The elongation of the FSP material is 268% at 723 K and 1×10-2 s-1,indicating that high strain rate superplasticity could be achieved.On the other hand,the hot-rolled base material,which has a coarse grain structure,possesses no superplasticity under the experimental conditions. 展开更多
关键词 friction stir processing AZ31 magnesium alloy superplasticity MICROSTRUCTURE
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MICROSTRUCTURAL EVOLUTION AND MECHANISMS OF SUPERPLASTICITY IN LARGE GRAINED IRON ALUMINIDES 被引量:7
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作者 Dongliang Lin (T.L.Lin) and Yi Liu Open Laboratory of Education Ministry of China for High Temperature Materials Tests, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China 《中国有色金属学会会刊:英文版》 CSCD 1999年第S1期228-239,共12页
The superplastic behavior has been found in Fe 3Al and FeAl alloys with grain sizes of 100~600 μm. The large grained Fe 3Al and FeAl alloys exhibit all deformation characteristics of conventional fine grain size sup... The superplastic behavior has been found in Fe 3Al and FeAl alloys with grain sizes of 100~600 μm. The large grained Fe 3Al and FeAl alloys exhibit all deformation characteristics of conventional fine grain size superplastic alloys. However, superplastic behavior was found in large grained iron aluminides without the usual prerequisites for the superplasticity of a fine grain size and grain boundary sliding. The metallographic examinations have shown that average grain size of large grained iron aluminides decreased during superplastic deformation. Transmission electron microscopy (TEM) observations have shown that there were a great number of subgrain boundaries which formed a network and among which the proportion of low and high angle boundaries increased with the increase of strain. The observed superplastic phenomenon is explained by continuous recovery and recrystallization. During superplastic deformation, an unstable subgrain network forms and these subboundaries absorb gliding dislocations and transform into low and high angle grain boundaries. A dislocation gliding and climb process accommodated by subboundary sliding, migration and rotation, allows the superplastic flow to proceed. 展开更多
关键词 iron ALUMINIDES superplasticity mechanism microstructural evolution DISLOCATION GLIDING DISLOCATION CLIMB superplastIC flow
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SUPERPLASTICITY AND DIFFUSION BONDING OF IN718 SUPERALLOY 被引量:8
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作者 W.B. Han K.F. Zhang B. Wang D.Z. Wu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2007年第4期307-312,共6页
The superplasticity and diffusion bonding of IN718 superalloy were studied in this article. The strain rate sensitivity index m was obtained at different temperatures and various initial strain rates using the tensile... The superplasticity and diffusion bonding of IN718 superalloy were studied in this article. The strain rate sensitivity index m was obtained at different temperatures and various initial strain rates using the tensile speed mutation method; m reached its maximum value 0.53 at an initial strain rate of 1×10^-4s^-1 at 1253K. The diffusion bonding parameters, including the bonding temperature T, pressure p, and time t, affected the mechanism of joints. When the bonded specimen with 25μm thick nickel foil interlayer was tensile at room temperature, the shear fracture of the joints with nickel foil interlayer took place at the IN718 part. Microstructure study was carried out with the bonded samples. The microstructure shows an excellent bonding at the interfaces. The optimum parameters for the diffusion bonding are: T = 1273-1323K, p = 20-30MPa, t = 45-60min. 展开更多
关键词 superplasticity diffusion bonding nickel foil IN718 alloy
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THE SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT BINARY Mg-8wt%Li ALLOY 被引量:6
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作者 F.R. Cao and J.Z. Cui(Department of Metalforming,P.O.B 317, Northeastern University, Shenyang 110006, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1997年第6期527-530,共4页
The maximum elongation-to-failure of 960% has been achieved in the Mg-8wt%Li alloy. It is shown by measurement of true stress-strain curve and microstructure observation that dynamic recrystallization takes place duri... The maximum elongation-to-failure of 960% has been achieved in the Mg-8wt%Li alloy. It is shown by measurement of true stress-strain curve and microstructure observation that dynamic recrystallization takes place during superplastic deformation, which turns the banded grains into equiaxed grains. It is postulated by theoretical analysis that during superplastic deformation,continuous introduction of lattice dislocations into the phase interfaces contributes to the superplasticity in this alloy.During superplastic deformation,grain growth and cavity nucleation at α phase grain boundaries have also been observed. 展开更多
关键词 superplasticity magnesium-lithium alloy dynamic recrystallization grain growth CAVITY
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APPLICATION OF GLEEBLE 1500 ON SUPERPLASTICITY 被引量:6
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作者 B. Z. Bai X.J.Sun and L.Y.Yang 1) Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2) Beijing Research Institute of Mechanical and Electrical Technology, Beijing 100083, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第2期514-520,共7页
Gleeble1500 thermo-mechanical simulation machine is considered to be the first grade equipment in materials' research. However, it is seldom used in superplastic research. Perhaps this is because its specimen'... Gleeble1500 thermo-mechanical simulation machine is considered to be the first grade equipment in materials' research. However, it is seldom used in superplastic research. Perhaps this is because its specimen's heating method is not suitable to get large elongation. Elongation is an important parameter to evaluate superplasticity, but some other parameters such as the relationship between stress and strain rate are more important than elongation-it is an essential property to superplasticity. The stress-strain rate relationship can be very easily and very accu- rately got with Gleeble machine than with some other simlar equipment, and the relationship between microstructure and superplastic deformation is more easily examined with Gleeble. Present authors have got some new achievement in anisotropy, heterogeneity of superplastic deformation, and first put forward the regulation of dynamic equilibrium in microstructural evolution during superplastic deformation. All of these have been concluded from the experimental results mainly through Gleeble as well as the microstructural examination.The research work has got the support of National Natural Science Foundation and some international cooperation. Some theoretic and experimental results have been used in the practice of superplastic forming. Obvious effect of reducing cost and improving quality of formed parts has been achieved. 展开更多
关键词 thermo-mechanical simulation superplasticity
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High strain rate superplasticity of SiC whisker reinforced pure aluminum composites 被引量:4
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作者 Xu Xiaojing(许晓静) Zhao Changzheng(赵昌正) +2 位作者 Zhang Di(张 荻) Shi Zhongliang(施忠良) Wu Renjie(吴人洁) 《中国有色金属学会会刊:英文版》 EI CSCD 1999年第3期500-504,共5页
A β SiC whisker reinforced pure aluminum composites expected to exhibit high strain rate superplasticity has been successfully fabricated by a new processing route consisting of pressure infiltration, extrusion with ... A β SiC whisker reinforced pure aluminum composites expected to exhibit high strain rate superplasticity has been successfully fabricated by a new processing route consisting of pressure infiltration, extrusion with a low extrusion ratio and rolling. The composites exhibite a total elongation of 220%~380% in the initial strain rates within 1.0×10 -2 ~1.0×10 -1 s -1 and at 893~903 K. According to differential thermal analysis(DTA) and microstructure observation, it is concluded that an appropriately small amount of liquid phase is necessary to cause a good high strain rate superplasticity in aluminum matrix composites in addition to fine and uniform microstructure. 展开更多
关键词 high STRAIN rate superplasticity ALUMINUM matrix COMPOSITES pressure INFILTRATION
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High strain rate superplasticity of rolled AZ91 magnesium alloy 被引量:6
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作者 WANG Qudong WEI Yinhong +1 位作者 Y. Chino M. Mabuchi 《Rare Metals》 SCIE EI CAS CSCD 2008年第1期46-49,共4页
The high strain rate superplastic deformation properties and characteristics of a rolled AZ91 magnesium alloy at temperatures ranging from 623 to 698 K(0.67Tm-0.76Tm) and high strain rates ranging from 10^-3 to 1 s^... The high strain rate superplastic deformation properties and characteristics of a rolled AZ91 magnesium alloy at temperatures ranging from 623 to 698 K(0.67Tm-0.76Tm) and high strain rates ranging from 10^-3 to 1 s^-1 were investigated.The rolled AZ91 magnesium alloy possesses excellent superplasticity with the maximum elongation of 455% at 623 K and a strain rate of 10-3 s-1,and its strain rate sensitivity m is high up to 0.64.The dominant deformation mechanism responsible for the high strain rate superplasticity is still grain boundary sliding(GBS),and the dislocation creep mechanism is considered as the main accommodation mechanism. 展开更多
关键词 AZ91 magnesium alloy high strain rate superplasticity ROLLING grain boundary sliding
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SUPERPLASTICITY AND SOLID STATE BONDING OF TITANIUM ALLOYS 被引量:4
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作者 R. Ya. Lutfullin, O.A. Kaibyshev, R.V. Safiullin, O.R. Valiakhmetov and M.H. Mukhametrahimov Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Ufa 450001, Russia 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第2期561-566,共6页
Experimental results related to solid state weldability of superplastic titanium alloys are presented. A correlation between superplastic flow and enhanced solid state weldability was established. It has been experim... Experimental results related to solid state weldability of superplastic titanium alloys are presented. A correlation between superplastic flow and enhanced solid state weldability was established. It has been experimentally shown that a drop in the lower superplastic flow temperature with decreasing mean grain size provides an opportunity to decrease the temperature at whicmethods for titanium alloys. 展开更多
关键词 superplasticity titanium alloy solid state bonding
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SUPERPLASTICITY IN SiC_w/ZK60 COMPOSITE 被引量:4
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作者 F.Yan K.Wu M.Zhao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第3期217-220,共4页
The superplastic deformation behavior of SiCw/ZK60 composite was investigated at temperatures ranging from 573K to 723K and at initial strain rates ranging from 8.3x10-4s-1 to 8.3x10-2s-1. A maximum elongation of 200%... The superplastic deformation behavior of SiCw/ZK60 composite was investigated at temperatures ranging from 573K to 723K and at initial strain rates ranging from 8.3x10-4s-1 to 8.3x10-2s-1. A maximum elongation of 200% with a m-value of 0.35 was obtained at 613K and a initial strain rate of 1.67x 10-2s-1. The apparent activation energy (98kJ/mol) approximates that for grain boundary diffusion (92kJ/mol) in magnesium. It is proposed that the dominant mechanism of superplastic deformation in the present composite is grain boundary sliding accommodated by diffusional transport, besides, interfacial sliding plays an important role in the superplastic deformation. 展开更多
关键词 magnesium matrix composite superplasticity apparent activation energy
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Thermomechanical Processing and Superplasticity of AZ91 Magnesium Alloy 被引量:3
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作者 RongshiCHEN J.J.Blandin +2 位作者 M.Suéry QudongWANG EnhouHAN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第3期295-297,共3页
The effect of extrusion on grain refinement has been studied in the AZ91 cast ingots. It is found that grain sizesmaller than 10μm can be obtained by the extrusion processing. Vickers hardness measurements were also ... The effect of extrusion on grain refinement has been studied in the AZ91 cast ingots. It is found that grain sizesmaller than 10μm can be obtained by the extrusion processing. Vickers hardness measurements were also carriedout to evaluate the effect of these processes on the room temperature mechanical properties. The experimentalresults of high temperature tensile tests revealed that the stress was inversely proportional to the square of the grainsize and that the activation energy for superplastic flow was higher than that for grain boundary diffusion. 展开更多
关键词 Magnesium alloy Thermo-mechanical treatment superplasticity Mechanical properties
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SUPERPLASTICITY OF A SiC_w/2024 Al COMPOSITE MADE BY PRESSURE INFILTRATION 被引量:3
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作者 X. J. Xu , W. Wang and L. CaiJiangsuUniversity of Science and Technology, Zhenjiang 212013, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第5期425-430,共6页
The superplastic characteristics of the β-SiC whisker reinforced 2024 aluminum composite, fabricated by pressure infiltration and hot-rolling after extrusion, were investigated. The composite has a fine grain size of... The superplastic characteristics of the β-SiC whisker reinforced 2024 aluminum composite, fabricated by pressure infiltration and hot-rolling after extrusion, were investigated. The composite has a fine grain size of about 1μm, and exhibits a maximum tensile elongation of 370% in the initial strain rate of 3.3×10-3 s-1 at 788K.The superplastic deformation mechanism of the composite is thought to be grain boundary (interface) sliding accommodated by grain boundary diffusion of aluminum atom and an appropriate amount of liquid phase. 展开更多
关键词 superplasticity aluminum matrix composites pressure infiltra-tion
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HIGH STRAIN RATE SUPERPLASTICITY IN A SiC_w/2024Al COMPOSITE MADE BY SQUEEZE CASTING 被引量:4
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作者 X.J.Xu D. Zhang +1 位作者 Z.L. Shi C.Z.Zhao and R.J. Wu (State Key Laboratory of Metal Matrir Composites, Shanghai Jiaotong University, Shanghai 200030, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1998年第4期275-280,共6页
In this paper,the superplastic characteristics of the beta-SiC whisker reinforced 2024aluminum composite, fabricated by squeeze casting and hot-rolling after extrusion were investigated. The compsite had a fine grain ... In this paper,the superplastic characteristics of the beta-SiC whisker reinforced 2024aluminum composite, fabricated by squeeze casting and hot-rolling after extrusion were investigated. The compsite had a fine grain size of about 2μm, and exhibited a strain rate sensitivity of about 0.35 and a maximum elongation of 350% at an initial strain rate of 1.1×10-1s-1 at 803K. In addition, the superplastic deformation mechanisme of the composite were also examined. 展开更多
关键词 high strain rate superplasticity aluminum matrix composite squeeze casting
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RESEARCH ON SUPERPLASTICITY IN SiCp/2024Al AND SiCp/8090Al-Li COMPOSITES 被引量:2
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作者 Zhang Libin, Wang Zongren (School of Materials Science and Engineering,Harbin Institute of Technology) Hai Jintao (China Academy of Machinery Science and Technology) Sano T Murakoshi Y Takahashi M Hanada K Mechanical Engineering Laboratory,AIST,MITI,J 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第4期370-372,共3页
The superplasticity in SiCp/Al alloy and SiCp/Al Li Composites is introduced The composites are prepared by powder metallurgy and cast methods The superplastic parameters are measured Superplastic treatment proc... The superplasticity in SiCp/Al alloy and SiCp/Al Li Composites is introduced The composites are prepared by powder metallurgy and cast methods The superplastic parameters are measured Superplastic treatment processing,secondary plastic working and the study of mirostructure are conducted. 展开更多
关键词 COMPOSITES Metal matrix composites superplasticity EXTRUSION
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HIGH STRAIN RATE SUPERPLASTICITY OF A AIN PARTICULATE REINFORCED 6061Al COMPOSITE 被引量:2
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作者 L.H. Han, J.T. Niu and D.M. Jiang (The National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology,Harbin 150001, China) T. Imai (National Industrial Research Institute of Nagoya, 1 Hirate-cho, Kita-ku, Nagoya 462, Ja 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2001年第2期127-131,共5页
The superplasticity of AINp/6061Al composite, fabricated by powder metallurgy method and hot-rolled after extrusion, was investigated. The AINp/6061Al composite exhibits an m-value of 0.49 and a maximum elongation of... The superplasticity of AINp/6061Al composite, fabricated by powder metallurgy method and hot-rolled after extrusion, was investigated. The AINp/6061Al composite exhibits an m-value of 0.49 and a maximum elongation of 438% in the strain rates ranging hem 10-2-100s-1 and at temperatures from 823K to 893K. Diffirential scanning calorimeter was used to ascertain the possibility of any partial melting in the vicinity of optimum superplastic temperature. These results suggested that liquid phase existed where maximum elongation was obtained. 展开更多
关键词 superplasticity aluminum matrix composite AIN particulate
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DYNAMIC RECRYSTALLIZATION AND SUPERPLASTICITY IN Al-Li ALLOY 被引量:2
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作者 Liu,Ziyi Cui,Jianzhong Bai,Guangrun Northeast University of Technology,Shengyang 110006,China 《中国有色金属学会会刊:英文版》 CSCD 1993年第2期76-79,共4页
The behavior of dynamic recrystallization in the superplastic deformation of 8090 and 2091 aluminum-lithium alloys have been investigated.TEM observations indicated that dynamic recrystallization occurs at thetriple j... The behavior of dynamic recrystallization in the superplastic deformation of 8090 and 2091 aluminum-lithium alloys have been investigated.TEM observations indicated that dynamic recrystallization occurs at thetriple junction of grain boundaries.The measurement of grain boundary angle showed that recrystallization indynamic equilibrium exists in the process of superplastic deformation of 8090 Al-Li alloy.It is also indicatedthat,besides the role of refining grains and the grain boundary sliding,dynamic recrystallization playsconcurrently a role of stablizing microstructure.Thus dynamic rccrystallization can be used to induce metalssuperplasticity,which leads to a simplification of pretreatment for superplastic deformation. 展开更多
关键词 dynamic RECRYSTALLIZATION superplasticity AL-LI ALLOY mechanism
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