上海交通大学学报

上海交通大学学报（自然版）

• 金属学与金属工艺 • 上一篇    下一篇

Au-Cu-Al合金相变的内耗

金明江，顾一嘉，金学军   

  1. （上海交通大学 材料科学与工程学院， 上海200240）
  • 收稿日期:2009-05-09 修回日期:1900-01-01 出版日期:2010-05-31 发布日期:2010-05-31

Internal Friction Analysis of Transformations in Au-Cu-Al Alloy

JIN Mingjiang,GU Yijia,JIN Xuejun   

  1. (School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2009-05-09 Revised:1900-01-01 Online:2010-05-31 Published:2010-05-31

摘要： 利用内耗方法分别对淬火态和时效态Au7Cu5Al4合金的相变过程进行了研究，分析了2种状态马氏体相变的差异.结果表明：淬火态与时效态Au7Cu5Al4合金的马氏体相变开始温度分别为-2.7和13.8 °C;根据驰豫内耗峰信息得出其晶界驰豫激活能分别为131.5和93.0 kJ/mol，反映了时效前后Au7Cu5Al4合金有序度的差异，即淬火态Au7Cu5Al4合金母相在室温下主要为B2结构，而时效态合金为L21有序结构.

关键词: Au-Cu-Al合金, 有序转变, 马氏体相变, 内耗

Abstract: The phase transformation in the asquenched and aged Au7Cu5Al4 alloys were investigated by internal friction technique. The results show that Ms temperatures of the asquenched and aged Au7Cu5Al4 alloys are -2.7 °C and 13.8 °C, respectively. The boundary relaxation activation energy for the quenched and aged Au7Cu5Al4 alloys were calculated for 131.5 kJ/mol and 93.0 kJ/mol, respectively, which indicates the difference of ordering states of the parent phases resulted by different thermal history. By high temperature internal friction measurement it is found that the B2→L21 ordering transition is interrupted by quenching and the parent phase state of quenched Au7Cu5Al4 alloy shows B2 ordering, which suppresses martensitic transformation.

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