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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