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。
The bainitic transformation in a Cu-Zn-Al-Mn alloy has been examin-ed with TEM. The results show that the stacking faults and also the bainitic mi-drib are found at the beginning of bainite formation in the alloy. The stack-ing fault planes can pass continuously through the midrib in bainite. The growthledges occur at the broad faces and rims of bainite. The broad and narrow faces ofthe ledges are parallel to the fault plane and habit plane respectively. Both theirMiller indices are {110}_(B_2). The moving direction of ledges is parallel to the faultplane. It may be deduced that bainites in a Cu-Zn-Al-Mn alloy are initially form-ed by shear and the process of growth are governed by propagation of fault planes.
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