Microstructural evolution behavior of aluminum alloy during friction stir welding under different welding and cooling conditions

Dynamic recrystallization (DRX) occurs during friction stir welding (FSW) of Al alloys, but the detailed microstructure evolution have not been elucidated clearly. In this study, the grain evolution mechanism during FSW was investigated with 3 mm thick Al-Mg-Si alloy sheets by the “take-action” technique of FSW. It was found that the FSW of Al alloys included four stages: dynamic recovery, dislocation multiplication, new grain formation and grain growth. we provided the research data including processed data, hardness data, and EBSD data.

在铝合金的摩擦搅拌焊（FSW）过程中，动态再结晶（DRX）现象会发生，然而其详细的微观结构演变尚无明确阐释。本研究通过摩擦搅拌焊的“take-action”技术，对3毫米厚的Al-Mg-Si合金板在FSW过程中的晶粒演变机制进行了探究。研究发现，铝合金的FSW过程包括四个阶段：动态回复、位错增殖、新晶粒形成和晶粒生长。本研究提供了包括处理数据、硬度数据和电子背散射衍射（EBSD）数据在内的研究数据。