Double extrusion of Mg-Al-Zn alloys

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• 作者：Liwei Lu ; Chuming Liu ; Zhenru Yin ; Jun Zhao…
• 关键词：Magnesium alloys ; Extrusion ; Microstructure ; Mechanical properties
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：89
• 期：1-4
• 页码：869-875
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design;
• 出版者：Springer London
• ISSN：1433-3015
• 卷排序：89

文摘

We perform forward extrusion integrated torsional deformation of AZ31 Mg alloys. Grains in the alloys are found to be refined with weakened basal texture, resulting in significantly improved mechanical properties. The yield strength and elongation of the single-extruded alloy are 82 MPa and 16.3 %, respectively, yet are increased to 95 MPa and 29.2 %, respectively, after a secondary extrusion at 523 K. We also find that the double extrusion ratio plays a critical role in refining grains, and that the torsional deformation is critical to improving the homogeneity of microstructures and weakening basal texture. Grains are found to turn coarsened with the rise of double extrusion temperature, which lowers the mechanical properties of the alloys. A superior mechanical anisotropy is obtained in the AZ31 alloys after double extrusion.