通过基于密度泛函理论(DFT)的第-性原理计算了纯金属Al和Al-Mg合金在(111)[112]滑移系的层错能和孪晶形变能,分析了Mg含量、占位对层错能和孪晶形变能的影响.计算选用了局域密度近似(LDA)和广义梯度近似(GGA-PW91)2种近似方法,发现GGA-PW91所获得的层错能与实验结果符合较好.研究结果表明,纯Al的层错能高于孪晶形变能,随着孪晶层厚度的增加孪晶形变能略有提高,6层呈完全镜面对称挛晶具有的孪晶形变能最低;Mg含量增加可使Al-Mg合金的层错能、变形孪晶形变能明显降低;Mg在Al-Mg合金中占位对结合能和形成热的影响很小,当Mg处于层错层时略使层错能和孪晶形变能提高.
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