Microstructure and properties of Nd:YAG laser welded AZ31B magnesium alloy

作者：Cui Zeqin^*; Cheng Linxin; Si En; Wang Wenxian; Xu Bingshe

来源：China Welding, 2014, 23(2): 29-35.

• AZ31B magnesium alloys
• Butt-welded joints
• Laser welded joints
• Mg alloy sheets
• Microstructure and properties
• ND : YAG lasers
• Nd:YAG laser welding
• Nd:YAG pulsed laser

Biodegradable magnesium-based alloys are very promising materials for temporary implants. Laser welding is an important joining method in such application. In this study, the as-rolled AZ31B magnesium alloy sheets of 1mm in thickness were successfully joined by Nd:YAG laser welding. The microstructure and properties of the welded joint were investigated. The result shows that the welded joint is characterized by a narrow heat-affected zone, finer grains and a large number of precipitates distribute in the matrix in the weld. Microhardness of the weld is significantly improved to 72 HV0.05 as compared to 55 HV 0.05 of the base metal. Tensile strength of butt-welded joint is 180.24 MPa, which is 76.8% that of the base metal. The electrochemical corrosion experiment shows that the corrosion resistance of laser welded joint is significantly improved in a 3.5 wt.% NaCl solution.

• 出版日期2014
• 单位太原理工大学