Liu Yu, Zhu Gaoming, Wang Yaqi, Xin Zhifeng, Hao Ning, Huang Wei, Yi Sangbong, Letzig Dietmar, Lienert Ulrich, Wang Jie, Zeng Xiaoqin
National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
Institute of Material and Process Design, Helmholtz-Zentrum Hereon, 21502, Geesthacht, Germany.
Sci Rep. 2024 Oct 3;14(1):22993. doi: 10.1038/s41598-024-73767-0.
This study investigates the microstructural characteristics and mechanical properties of a laser welded AZ80 magnesium alloy. The welding process led to the formation of coarse-grained fusion zone (FZ), where a secondary phase formed continuous network. MgAl precipitation and coarsening of grain boundaries occurred in the heat affected zone. The welded joint exhibited excellent mechanical properties with a yield strength of 202 MPa and a joint efficiency of 92%. The microstructure analysis via EPMA and EBSD in conjunction with synchrotron X-ray diffraction analysis reveals that precipitates and increased dislocation density in the fusion zone are primary strengthening mechanisms for the laser welded AZ80 Mg alloy.
本研究调查了激光焊接AZ80镁合金的微观结构特征和力学性能。焊接过程导致形成了粗大晶粒的熔合区（FZ），其中第二相形成了连续网络。热影响区发生了MgAl析出和晶界粗化。焊接接头表现出优异的力学性能，屈服强度为202MPa，接头效率为92%。通过电子探针微量分析（EPMA）和电子背散射衍射（EBSD）结合同步加速器X射线衍射分析的微观结构分析表明，熔合区中的析出物和位错密度增加是激光焊接AZ80镁合金的主要强化机制。
