匀强电场作用下纯铝在480℃的拉伸变形行为
Deformation Behavior of Pure Aluminium in a DC Electric Field at 480 ℃
摘 要
从晶体的位错结构出发,研究了电场对纯铝在480 ℃变形时的作用机理;用光学显微镜和扫描电镜对材料的显微组织和断口形貌进行了分析.结果表明:外加电场可以降低纯铝高温变形时的屈服强度和塑性变形的流变应力,降低了变形时晶粒内的位错密度;同时外加电场有效地抑制了变形时空洞的形成,提高了断裂伸长率;施加匀强电场的强度和极性对于纯铝高温变形过程中位错运动的影响不同.
直流电场
高温变形
位错密度
pure aluminium
DC electric field
high temperature deformation
dislocation density
Abstract
The action mechanism of electric field on pure aluminium deformed at 480 ℃ was studied mainly in term of dislocation structure.The microstructure and fracture was analyzed by optical microscopy and SEM.The results show that the application of electric field resulted in the decrease of flow stress,yield strength and dislocation density during the high temperatre deformation process of pure aluminium.The electric field also suppressed the nucleation and growth of internal cavities in the tension deformation process,and increased the tensile elongation.The intensity and polarity of applied electric field affected the dislocation movement in elevated temperature tension deformation process of pure Al.
中图分类号 TG146.2
所属栏目 试验研究
基金项目 教育部科学技术研究重点项目(106055)
收稿日期 2007/12/5
修改稿日期 2008/2/28
网络出版日期
作者单位点击查看
备注王东民(1981-),男,山东淄博人,硕士研究生.
引用该论文: WANG Dong-min,ZHOU Wen-long,HOU Hong-liang,WU Cheng-wei,LI Zhi-qiang,GAO Hong-wei. Deformation Behavior of Pure Aluminium in a DC Electric Field at 480 ℃[J]. Materials for mechancial engineering, 2008, 32(12): 8～11
王东民,周文龙,侯红亮,吴承伟,李志强,高红伟. 匀强电场作用下纯铝在480℃的拉伸变形行为[J]. 机械工程材料, 2008, 32(12): 8～11
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参考文献
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【3】Yang D,Conrad H.Influence of an electric field on the plastic deformation of polycrystalline NaCl at elevated temperatures[J].Acta Mater,1998,46:1963-1968.
【4】Baranov Y V.Effect of electrostatic fields on mechanical characteristics and structure of metals and alloys[J].Mater Sci Eng,2000,A287:288-300.
【5】Conrad H,Yang D.Influence of an electric field on the plastic deformation of fine-grained MgO at high homologous temperatures[J].Acta Mater,2000,48:4045-4052.
【6】徐俊.电场热处理对IF深冲钢板和42CrMo钢显微组织、织构及性能的影响[D].沈阳:东北大学,2003.
【7】Conrad H.Electroplasticity in metals and ceramics[J].Mater Sci Eng,2000,A287:276-287.
【8】樊慧军,陈国清,周文龙,等.直流匀强电场作用下镍钛合金高温变形行为研究[J].中国有色金属学报,2006,16:1012-1018.
【9】林林,陈文.金相法分析高纯铝箔再结晶织构研究[J].四川冶金,1997,19:63-67.
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