【作者】 孔庆平； 崔平； 蒋卫斌； 石云； 方前锋；

【Author】 KONG Qing-ping CUI Pin JIANG Wei-bing SHI Yun FANG Qian-feng (Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031)

【机构】 中国科学院固体物理研究所材料物理重点实验室；

【摘要】 由不同取向差的纯 Al 双晶的内耗实验观察到,不同类型晶界的弛豫参量有明显差别。用耦合模型对内耗数据的分析表明,小角度晶界内耗的基本机制是位错攀移,而大角度晶界内耗的基本机制是晶界扩散。在此基础上,对多晶中晶界内耗的一些特征也作了解释。更多还原

【Abstract】 By measuring the internal friction in pure Al bicrystals with different misorientations,we find that the relaxation parameters are different among different types of grain boundaries(GBs).An analysis of the internal friction data by a coupling model shows that the basic mechanism of GB internal friction for low-angle GBs is dislocation climb,while that for high-angle GBs is GB diffusion.Based on the results obtained,the specific behavior of GB internal friction in polycrystals is also explained.更多还原