High temperature tensile properties of laser-welded high-strength Mg-Gd-Y-Zr alloy in as-welded and heat-treated conditions

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• 作者：Lyuyuan Wang ; Jian Huang ; Jie Dong ; Zhuguo Li ; Yixiong Wu
• 关键词：(IIW Thesaurus)Magnesium alloys ; Post ; weld heat treatment ; Mechanical properties ; Microstructure ; Elevated temperature strength
• 刊名：Welding in the World
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：61
• 期：2
• 页码：299-306
• 全文大小：
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：61

文摘

The high temperature tensile properties of fiber laser-welded Mg-Gd-Y-Zr alloy in the as-welded and heat-treated state were systematically studied. The elevated temperature tensile properties of as-welded and heat-treated joints declined slightly from room temperature to 200 °C. With the temperature reaching 300 °C, the strengths of the two types of joints plummeted. High temperature tensile properties can be enhanced significantly by the β′ precipitates in the fusion zone and heat-affected zone after heat treatment. The ultrafine grains and unstable divorced eutectic in the fusion zone of as-welded joints deteriorated the tensile properties at 300 °C. The deformation mechanism of the heat-treated samples at 300 °C is the dislocation slip with void growth at the grain boundaries due to the dissolution of precipitates.