Nd:YAG laser weldability and tensile strength of AZ91D magnesium alloy butt joints

摘要：

The microstructure and phase constituent for the magnesium alloy laser beam welded joints have been studied via scanning electron microscope (SEM) and Xray diffraction (XRD). The strength of welded joints are obtained through tensile testing. The testing results indicated that the new compact phases are formed in welding metal. The fracture morphology mainly consists of coarse and gray fracture, and the fracture is mainly the mixed fracture of cleavage and brittleness. Tensile testing results prove that fracture strain is very low. X-ray diffraction test indicates that the welding metal consists of a-solid solution and intermetallic compounds β-Mg12Al12 phase. Microcracks on the fracture faces lead to the low strength of welded joints.

关键词： Laser beam welding Magnesium alloy Fracture morphology XRD

作者: Chunwei Ma Peng Sun Peiquan Xu

作者单位: Department of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

会议类型: 国际会议

会议名称: 2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011

会议地点: 合肥

会议语种:英文

页码: 377-383

在线出版日期: 2011-10-27（万方平台首次上网日期，不代表论文的发表时间）