洞察Mg-Gd-Y-Zr合金微观结构和机械性能的Y内容
Yongfeng Li1, Ang Zhang1, Chuangming Li1
1National Engineering Research Center for Magnesium Alloys, National Key Laboratory of Advanced Casting Technologies, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
Materials (Basel, Switzerland)
|June 13, 2025
概括
将伊 (Y) 添加到-加多- (Mg-Gd-Y-Zr) 合金中,可以提高机械性能,可达3重%Y. 较高的Y含量 (重量5%),由于Mg5(Gd,Y) 阶段的增长而降低强度,影响裂传播.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 合金开发 合金开发
背景情况:
- 合金的重量轻,但往往缺乏足够的机械强度,以适应苛刻的应用.
- 加多 (Gd) 和 (Zr) 的添加提高了 (Mg) 合金的性能.
- 伊 (Y) 在Mg-Gd-Zr合金中的作用需要进一步的系统研究.
研究的目的:
- 研究不同 (Y) 含量对成型Mg-9Gd-xY-0.5Zr合金的微观结构和机械性能的影响.
- 为了确定达到高强度合金的最佳Y含量.
- 了解随着Y内容的增加而发生的财产变化背后的机制.
主要方法:
- 系统地制备 Mg-9Gd-xY-0.5Zr 合金,其 Y 含量各不相同 (x = 0,3,5%).
- 微结构分析使用观察颗粒大小和相位形成的技术 (例如,Mg5(Gd,Y)).
- 机械性能测试,包括最终抗拉强度和度强度测量.
主要成果:
- 机械性能和颗粒大小最初随着Y含量增加,达到3重%Y的峰值.
- 与没有Y的合金相比,含有3重%Y的合金的最终抗拉强度增加了33.4%,收益强度增加了19.2%.
- 在5 wt.% Y时,Mg5 ((Gd,Y) 阶段的形成充当了裂起始点,降低了整体机械性能.
- 立方相REH2和氧化物的含量低并不是柔性差的主要原因;它们的晶体学关系和与α-Mg的接口不匹配被量化.
结论:
- 添加显著影响Mg-Gd-Y-Zr合金的微观结构和机械性能.
- 为了最大限度地提高这些造合金的强度,存在最优的Y含量 (3%).
- 了解相位演变和裂纹传播对于设计高性能合金至关重要.
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