Microstructures and mechanical properties of Mg-2%Zn-0.4%RE alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 352 - 356
• Main Author: 乐启炽 张志强 邵志文 崔建忠 谢一
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110004,China
• Subjects: Alloys; Extrusion; Magnesium base alloys; Mechanical properties; Mg-2%Zn alloy; Microstructure; rare earth; Rare earth metals; Solidification; Strength; 凝固微观组织; 力学性能; 基合金; 平均晶粒尺寸; 稀土元素; 质量分数; 镁锌合金; rare earth; microstructure; Mg-2%Zn alloy; mechanical properties; Mg-2％Zn alloy
• ISSN: 1003-6326
• DOI: 10.1016/s1003-6326(10)60496-7

The solidification microstructures and hardness of Mg-2%Zn （mass fraction） based alloys with addition of 0.4%Ce, 0.4%Gd, 0.4%Y or 0.4%Nd （mass fraction） were investigated, and the effects of the rare earth elements on the microstructures and mechanical properties of these alloys extruded at 310℃ were also compared. The results indicate that the trace rare earth Ce, Gd, Y or Nd in the Mg-2%Zn alloy has obviously different grain refinement effects on its solidification microstructures, and the as-cast and hot-extruded alloy with 0.4%Ce has the smallest average grain size and the highest strength. However, the extruded alloys containing 0.4%Nd or 0.4%Y with the elongation of 26.6% and 30%, respectively, show higher plasticity in spite of lower strength as compared with the alloy containing 0.4%Ce.