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时效析出相在强变形过程中的室温回归现象 被引量：2

Investigation on Retrogressive Phenomenon of Aged Precipitates Caused by Severe Plastic Deformation in Al-Zn-Mg-Cu Alloy
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摘要 利用透射电镜和硬度测量实验手段 ,研究了多相Al Zn Mg Cu合金在强烈塑性变形中的组织和性能变化 ,特别是析出相的改变。结果发现 :强烈塑性变形加工可引起析出相变形、碎化 ,然后溶入基体形成过饱和固溶体。这种合金在重新时效处理时可再次沉淀析出。提出了析出相回溶现象的“畸变自由能”观点。认为因晶格畸变导致析出相自由能显著升高 ,当高于基体相的自由能时 ,便会发生析出相室温溶解的自发过程 ,称此过程为应变回归以区别于由热处理时加热引起的回归。 The evolution of microstructure and properties of Al-Zn-Mg-Cu alloy in the process of heavy plastic deformation were studied by transmission electron microscopy and hardness measurement. It is found that the precipitates are deformed, fragmented, and followed by dissolution into the matrix to form super-saturated solid solution in severe plastic deformation process. This solid solution will decompose again during re-aging. The distorted free energy hypothesis is proposed in order to interpret the re-dissolution and re-precipitation of the precipitates. This process is termed strain induced retrogression to differentiate from thermally induced retrogression by heat treatment.
作者 许晓嫦 刘志义 谭曼玲 刘跃军 吴纯
机构地区 中南大学材料科学与工程学院 株洲工学院
出处 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第6期71-75,共5页 Transactions of Materials and Heat Treatment
基金 湖南省自然科学基金资助项目 (0 3JJY30 74)
关键词 强烈塑性变形 AL-ZN-MG-CU合金 回归 时效 Aging of materials Copper alloys Magnesium alloys Mechanical properties Metallographic microstructure Plastic deformation Precipitation (chemical) Solid solutions Transmission electron microscopy Zinc alloys
分类号 TG146.2 [金属学及工艺—金属材料] TG113 [金属学及工艺—物理冶金]
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参考文献25

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共引文献54

同被引文献14

  • 1许晓嫦,刘志义,党朋,于文斌,谭曼玲,吴纯.研究强塑性变形过程中第二相回溶现象的现状及发展趋势[J].金属热处理,2005,30(4):1-6. 被引量：15
  • 2许晓嫦,刘志义,党朋,谭曼玲.室温强塑性变形下回溶和再析出的机理研究[J].材料科学与工艺,2005,13(2):178-181. 被引量：11
  • 3GenKi S,Aznji H,T erence G L.Grain refinement and superplasticity in an alloy processed by high-pressure torsion[J].Mater Sci Eng,2005,A393:344
  • 4Kim H K,Kin W J.Microtructural instability and strength of an AZ31 Mg alloy after severe plastic deformation[J].Mater Sci Eng,2004,A385:300
  • 5Hong S I,Kim P H,Choi Y C.High strain rate superplasticity of deformation processed Cu-Ag filamentrary composites[J].Scr Mater,2004,51:95
  • 6Schafler E,Pippan R.Effect of thermal treatment on micristructure in high pressure torsion(HPT) deformed nickel[J].Mater Sci Eng,2004,A387-389:799
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  • 8Wei Q,Jiao T.Adiabatic shear banding in ulterfine-grained Fe processed by severe plastic deformation[J].Acta Mater,2004,52:1859
  • 9Yuntian Z,Terry C L,Terence G L.Performance and application of nanostrucural materials produced by severe plastic deformation[J].Scr Mater,2004,51:825
  • 10Hong M H,Reynolds W T,Tarui T,et al.Microstructural changes in aluminum alloy by Equal Channel Angular Extrusion[J].Metall Mater Trans,1999,30A:713

引证文献2

二级引证文献10

材料热处理学报
2004年 第6期

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