上海交通大学学报

上海交通大学学报（自然版）

• 物理学 • 上一篇    下一篇

纯铝双晶中倾侧晶界和扭转晶界的内耗

蒋卫斌，孔庆平，崔平，方前锋   

  1. （中国科学院 固体物理研究所材料物理重点实验室， 合肥 230031）
  • 收稿日期:2009-05-05 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Study on Internal Friction of Pure Al Bicrystals with Tilt and Twist Grain Boundaries

JIANG Weibin，KONG Qingping，CUI Ping，FANG Qianfeng   

  1. (Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China)
  • Received:2009-05-05 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要： 利用强迫振动模式，在多功能内耗仪上测量含<111>转轴的倾侧晶界和扭转晶界的纯铝双晶内耗，并从晶界结构的角度加以解释，采用耦合模型对晶界弛豫机制进行分析.结果表明：扭转晶界和倾侧晶界的内耗弛豫参数差别明显；当倾侧晶界和扭转晶界的取向差接近于60°时，不出现晶界内耗峰，表明共格和非共格取向差接近于60°的特殊晶界具有较高的力学稳定性.

关键词: 晶界, 内耗, 双晶, 耦合模型

Abstract: The internal friction of <111> tilt and twist grain boundaries in pure Al bicrystals with different misorientations was studied. The measured activation parameters of twist grain boundaries are different from those of tilt grain boundaries, which was explained by the difference of grain boundaries microstructure. With the help of a coupling model, the basic relaxation processes of different types of grain boundaries were suggested. In addition, when the misorientation angles of both tilt and twist grain boundaries are near to 60°, the grain boundarie internal friction peak does not appear, indicating that both coherent and incoherent near to 60° grain boundaries are highly resistant to stressinduced motion.

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