Microstructural Characterization of an Al-Mg-Si Aluminum Alloy Processed by Equal Channel Angular Pressing
In the present work,a peak-aged 6061 Al-Mg-Si aluminum alloy was subjected to equal channel angular pressing (ECAP) at 110 ℃.The microstructure of the sample was characterized by high-resolution transmission electron microscope and weak-beam dark-field method.It was shown that the dislocation density in some local areas is much lower than the average dislocation density expected in the usual alloys processed by severe plastic deformation.High-resolution transmission electron microscope observations indicated that many full dislocations were dissociated into partial dislocations connected by stacking faults.In addition,a Z-shaped defect (i.e.,a type of dislocation locks) probably formed by the reactions of the partials in different 111 planes was first observed in the ECAPed alloy.Furthermore,the precipitation behavior and sequence in the present ECAPed sample were identified by high-resolution transmission electron microscopy.
Al-Mg-Si aluminum alloy Severe plastic deformation Dislocation Z-shaped defects Stacking faults Precipitation
Zhen Zhang Manping Liu Yingda Yu P(a)l C. Skaret Hans J. Roven
School of Materials Science and Engineering, Jiangsu University,301 Xuefu Road, Zhenjiang 212013, Ch Department of Materials Science and Engineering, Norwegian University of Science and Technology(NTNU
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
303-308
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）