3004铝合金动态应变时效的微观机理
彭开萍,陈文哲,钱匡武
摘要(Abstract)：
在应变速率为5.56×10-5~5.56×10-3s-1的范围内,从223~773K,每间隔25K,对3004铝合金进行系列拉伸试验;通过激活能的计算、内耗研究、微观组织观察和能谱分析,探讨3004铝合金动态应变时效的微观机制。结果表明:经动态应变时效后,出现了内耗温度峰;位错组态严重缠结,在缠结处存在Mg原子,认为该合金的动态应变时效现象是由于Mg溶质原子气团通过空位扩散与运动中的位错交互作用的结果,与原始状态析出相的存在无关。
关键词(KeyWords)： 动态应变时效(DSA);铝合金;激活能;内耗;位错
基金项目(Foundation): 国家自然科学基金(50441013);; 福建省教育厅资助项目(JA03015)
作者(Author): 彭开萍,陈文哲,钱匡武
参考文献(References)：
- 1钱匡武,李效琦,萧林钢,等.金属和合金中的动态应变时效现象[J].福州大学学报,2001,29(6):8~23.QIAN Kuang-wu,LI Xiao-qi,XIAO Lin-gong,et al.Dynamic strain aging phenomenon in metals and alloys[J].J Fuzhou University,2001,29(6):8~23.
- 2 Soubodh Kuma,Erwin Pink.Dynamic strain aging in a tungsten heavy metal[J].Scripta Materialia,1996,35(9):1047~1052.
- 3 Dehghani K,Jonas J J.Dynamic bake hardening of interstitial-free steels[J].Metallurgical and Materials Transactions,2003,31:1375~1381.
- 4 Sinisa D J,Mesarovic.Dynamic strain aging and plastic instabilities[J].J Mech Phys Solids,1995,3(5):671~700.
- 5 Nortmann A,Schwink C H.Characteristics of dynamic strain ageing in binary fcc.copper alloys-I.Results on solid solutions of CuAl[J].Acta Mater,1997,45(5):2043~2050.
- 6钱匡武,彭开萍,陈文哲.金属动态应变时效现象中的“锯齿屈服”[J].福建工程学院学报.2003,1(1):4~8.QIAN Kuang-wu,PENGKai-ping,CHEN Wen-zhe.The serration flow in the metals[J].Journal of Fujian University of Technology,2003,1(1):4~8.
- 7 Schuh C A,Nieh T G.A nanoindentation study of serrated flow in bulk metallic glasses[J].Acta Materialia,2003,51:87~89.
- 8 Nabarro F R N.Report of a conference on the strength of solids[R].The Physical Soc,1948.38.
- 9 McCormick P G.A model for the portevin-Le chatelier effect in substitutional alloys[J].Acta Metall,1972,20:351~359.
- 10 Schoeck G.The portevin-Le chatelier effect,a kinetic theory[J].Acta Metall,1984,32:1229~1234.
- 11 Korbel A,Zasadzinski J,Slieklucka Z.A new approach to the portevin-Le chatelier effect[J].Acta Metall,1976,24:919~923.
- 12 Penning P.Mathematics of the portevin-Le chatelier effect[J].Acta Metall,1972,20;1169~1175.
- 13 Qian K W,Reed-Hill R E.A model for the flow stress and strain rate sensitivity of a substitutional alloy-Cu-3.1%(at)Sn[J].Acta Metall,1983,31:87~94.
- 14 Pink E,Kumar S,Tian B.Serrated flow of aluminum alloys influenced by precipitates[J].Materials Science and Engineering,2000,A280:17~24.
- 15于宁,戢景文,变形Fe-Nb-C合金的室温至180℃内耗[J].金属学报,2002,38(3):230~234.YU Ning,JI Jingwen.The internal friction of deformed Fe-Nb-C alloys in the range from temperature to 180℃[J].Acta Metallurgica Sinica,2002,38(3):230~234.
文章评论(Comment)：
|
||||||||||||||||||
|
||||||||||||||||||