【作者】 金明江； 顾一嘉； 金学军；

【Author】 JIN Ming-jiang,GU Yi-jia,JIN Xue-jun(School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

【机构】 上海交通大学材料科学与工程学院；

【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.更多还原

【Abstract】 The phase transformation in the as-quenched and aged Au₇Cu₅Al₄ alloys were investigated by internal friction technique.The results show that M_s 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.更多还原