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Microstructure and strengthening mechanism of die-cast Mg-Gd based alloys

机译：压铸Mg-Gd基合金的组织与增强机理

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摘要

Mg-8Gd-2Y-Nd-0.3Zn (wt%) alloy was prepared by the high pressure die-cast technique. The microstructure, mechanical properties in the temperature range from room temperature to 573 K, and strengthening mechanism were investigated. It was confirmed that the Mg-Gd-based alloy with high Gd content exhibited outstanding die-cast character. The die-cast alloy was mainly composed of small cellular equiaxed dendrites and the matrix. The long lamellar-shaped stacking compound of Mg_3X (X: Gd, Y, Nd, and Zn) and polygon-shaped precipitate of Mg_5RE (RE: Gd, Y, and Nd) were mainly concentrated along the dendrite boundaries. Meanwhile, it was demonstrated that the Zn addition affects the formation of non-equilibrium precipitate Mg_3X. The ultimate tensile strength, yield strength, and Young's modulus were 302 MPa, 267 MPa, and 38 GPa at room temperature, respectively. The outstanding mechanical properties were mainly attributed to the small dendrite spacing, wide skin region, and some dispersed precipitates in the alloy formed by the high-pressure die-cast technique. Designing a novel die-cast Mg alloy with good heat resistance without Al element is a significant accomplishment.
机译：通过高压压铸技术制备了Mg-8Gd-2Y-Nd-0.3Zn（wt％）合金。研究了室温至573 K温度范围内的显微组织，力学性能以及增强机理。证实了具有高Gd含量的Mg-Gd基合金表现出突出的压铸特性。压铸合金主要由小孔等轴枝晶和基体组成。 Mg_3X（X：Gd，Y，Nd和Zn）的长层状堆积化合物和Mg_5RE（RE：Gd，Y和Nd）的多边形沉淀物主要沿枝晶边界集中。同时，证明了Zn的添加影响非平衡沉淀Mg_3X的形成。室温下的极限抗拉强度，屈服强度和杨氏模量分别为302 MPa，267 MPa和38 GPa。优异的机械性能主要归因于小枝晶间距，较宽的表皮区域以及在高压压铸技术形成的合金中一些分散的沉淀物。设计一种新型的具有良好耐热性且不含Al元素的新型Mg合金是一项重大成就。

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  • 来源
    《Journal of Materials Research》 |2008年第5期|p.1269-1275|共7页
  • 作者

    Qiuming Peng; Lidong Wang; Yaoming Wu; Limin Wang;

  • 作者单位

    State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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