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材料工程  2012 

AZ31镁合金在累积叠轧焊过程中的界面焊合研究

, PP. 18-24

Keywords: Mg3Al1Zn镁合金,累积叠轧焊,界面,焊合

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Abstract:

采用扫描电境观察了AZ31镁合金在累积叠轧焊(ARB)过程中的界面焊合现象。结果表明轧前预热温度为300℃和道次压下量为50%的累积叠轧焊工艺可以使AZ31板材获得良好的界面焊合,后续的累积叠轧焊变形可以有效改善界面焊合质量。ARB板材的拉伸断口呈现典型的延性断裂形貌,界面未形成良好焊合的部分呈现裂口焊合形貌。累积叠轧焊变形中的界面焊合过程包括表面硬化脆性层减薄、断裂,氧化膜破碎,暴露出来的新鲜金属在轧制压力的作用下沿裂纹流动、相互接触,形成冶金结合。后续退火可以改善界面焊合质量。

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