Microstructure and Strengthening Mechanism of Fiber Laser-Welded High-Strength Mg-Gd-Y-Zr Alloy

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• 作者：Lyuyuan Wang ; Jian Huang ; Zhuguo Li…
• 关键词：laser welding ; Mg ; Gd ; Y ; Zr alloy ; heat input ; microstructure ; mechanical properties ; strengthening mechanism
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：25
• 期：10
• 页码：4506-4513
• 全文大小：4,456 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024
• 卷排序：25

文摘

The microstructure and mechanical properties of laser-welded high-strength Mg-Gd-Y-Zr alloy in T6 condition were investigated. The network-distributed precipitates at grain boundaries were identified as the Mg₂₄(Gd,Y)₅. No significant grain coarsening was observed in the heat-affected zone. The deterioration of mechanical properties was attributed to the dissolution of precipitates in the heat-affected zone during laser welding. For the weakest part of the heat-affected zone, solid solution strengthening was the most important strengthening factor.