【作者】 蔡正旭； 王卫国； 方晓英； 郭红；

【Author】 CAI Zhengxu~1,WANG Weiguo~1,FANG Xiaoying~1,GUO Hong~2 School of Mechanical Engineering,Shandong University of Technology,Zibo 255049 Center of Testing and Analysis,Shandong University of Technology,Zibo 255049

【机构】 山东理工大学机械工程学院； 山东理工大学分析测试中心；

【摘要】 采用电子背散射衍射(EBSD)技术研究了不同变形量冷轧的工业纯铜样品经650℃/5min高温退火后的晶界特征分布(GBCD)。结果表明:经小变形(10%)轧制并退火的样品中出现了较多的∑3,∑9和∑27特殊晶界,特殊晶界的比例达到76%,有效地阻断了一般大角度晶界的网络连通性,样品的GBCD得到优化。随着轧制变形量的不断增加(20%-40%),样品经高温退火后,特殊晶界的比例逐渐下降,不能有效地阻断一般大角度晶界的网络连通性,样品的GBCD没有得到优化。进一步分析认为:和中等变形量(30%-40%)相比,小变形量的样品形变储存能较少,不足以在后续的退火过程中发生以生成一般大角度晶界为特征的再结晶行为,而是以应力诱发晶界迁移(SIBM)为主,这可能是GBCD得到优化的关键。更多还原

【Abstract】 The grain boundary character distributions(GBCD) of pure copper annealed at elevated temperatures(650℃/5min) after cold rolled with varied strain were investigated by means of electron back scatter diffraction(EBSD) techniques.The results showed that special boundaries such as∑3,∑9 and∑27 were largely populated in the specimen of low strain(10%) followed by annealing,the fraction of total special boundaries reached 76%.The connectivity of general high angle boundaries(HABs) networks was interrupted substantially by special boundaries,and the GBCD are optimized.As the strain of cold-rolling increased(20%-40%) and then annealed at elevated temperature,the fraction of total special boundaries was decreased when the sample were annealed,and the connectivity of general high angle boundaries (HABs) network was not interrupted significantly,implying the GBCD are not optimized.Further analysis shows that compare to the intermediate strain,low levels strain(10%) have little stored energy of deformation,which did not offer recrystallization process extensively during annealing,but the strain induced boundary migration(SIBM) might be active and it was probably the root of GBCD optimization.更多还原