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P/6061Al的变形断裂特征和塑性

, PP. 38-41

Keywords: 颗粒增强铝,变形与断裂,塑性

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Abstract:

为了更清楚地认识颗粒增强铝塑性差的细微观机制,进行了(Al2O3)P/6061Al的拉伸和三点弯曲变形实验,并用扫描电镜观察了变形与断裂的细微观特征。发现:(1)在加载过程中,总是基体先发生变形局部化,形成变形带;变形带内较大的Al2O3颗粒优先开裂,形成颗粒尺度的微裂纹;变形带内的集中变形和Al2O3颗粒的继续开裂交互作用,导致微裂纹沿着变形带连接与扩展进而发生宏观低塑性断裂;(2)加载方式、材料状态和变形温度对上述过程没有本质影响。根据以上观察结果和颗粒增强铝的强化机理,讨论了塑性差的细微观机制以及材料状态和变形温度对(Al2O3)P/6061Al塑性的影响。

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