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Cu-Zn-Al-Mn合金的贝氏体中脊和台阶

韩明 , 陈复民 , 陈金铭 , 陈玉如 , 刘文西

金属学报

用透射电镜详细地研究了Cu-Zn-Al-Mn合金的贝氏体相变。观察结果表明:该合金中贝氏体在形成初期已存在层错。同时观察到贝氏体中脊,贝氏体内部的层错面能够连续地通过中脊。在贝氏体宽面及端部存在长大台阶,台阶的宽面和窄面分别平行于贝氏体层错面和惯习面,其晶面指数均属{110}_(B2)晶面族,长大台阶的推进方向平行于层错面。由此推测,Cu-Zn-Al-Mn合金贝氏体在相变初期首先以切变方式形成,而其长大过程是由其层错面的扩展所控制。

关键词: Cu-Zn-Al-Mn合金 , bainitic midrib , growth ledge

MIDRIB AND LEDGE OF BAINITE IN A Cu-Zn-Al-Mn ALLOY

HAN Ming CHEN Fumin CHEN Jinming CHEN Yuru LIU Wenxi Tianjin University , Tianjin , China CHEN Fumin Professor , Dept.of Material Science and Engineering , Tianjin University Tianjin 300072 , China

金属学报(英文版)

The bainitic transformation in a Cu-Zn-Al-Mn alloy has been examined with TEM.The re- sults show that the stacking faults and also the bainitic midrib are found at the beginning of bainite formation in the alloy.The stacking fault planes can pass continuously through the midrib in bainite.The growth ledges occur at the broad faces and rims of bainite.The broad and narrow faces of th ledges are parallel to the fault plane and habit plane respectively.Both their Miller indices are {110}_(B2).The moving direction of ledges is parallel to the fault plane. It may be deduced that the bainite in alloy are initially formed by shear and the process of growth are go verned by propagation o f fault planes.

关键词: Cu-Zn-AI-Mn alloy , null , null

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