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通过Ca-La-Ce添加Mg-3Zn-1Mn/Sn合金的机械性能和微观结构演变的比较研究

Ke Hu^1,2,3, Tingting Tian¹, Yunfeng She³

¹School of Materials Science and Engineering, Guangdong Ocean University, Yangjiang Campus, Yangjiang 529500, China.

Materials (Basel, Switzerland)

|October 16, 2024

概括

添加诸如 (Ce),兰 (La) 和 (Ca) 等稀土元素显著提高了--锡 (Mg-Zn-Sn) 合金的强度. 然而,这些元素在-- (Mg-Zn-Mn) 合金中提供了平衡的强度和性能改善.

科学领域:

材料科学材料科学材料科学
金工业是一种金工业.
合金开发合金开发

背景情况:

合金对于轻量化应用至关重要.
了解微结构进化是提高机械性能的关键.
稀土元素的添加提供了合金改进的潜力.

研究的目的:

研究Ce,La和Ca对Mg-Zn-Mn和Mg-Zn-Sn合金的影响.
为了将微观结构的变化与机械性质的变化相关联.
为了确定最佳的稀土元素复合添加策略.

主要方法:

系统的合金设计和合成Mg-3Zn-1Mn/Sn合金.
(Ce),兰 (La) 和 (Ca) 元素的复合添加.
使用先进的显微镜和相位分析进行微结构性表征.
机械性能测试包括收益强度 (YS),最终抗拉强度 (UTS) 和延伸 (EL).

主要成果:

由于Mn粒子效应,Mg-Zn-Mn合金比Mg-Zn-Sn合金具有更高的强度.
加入Ca-La-Ce显著提高了Mg-Zn-Sn合金的强度 (YS +92.5%,UTS +29.2%,EL -52.2%).
Mg-Zn-Sn合金形成双模颗粒结构,添加稀土,促进更细的颗粒和阻碍再结晶,比Mg-Zn-Mn合金更有效.

结论:

稀土元素 (Ce,La,Ca) 不同地影响Mg-Zn-Mn和Mg-Zn-Sn合金的微观结构和性能.
Sn 和 Ca 促进了脆弱的二次阶段,影响了谷物边界的完整性.
纳米级Mg2Sn和Ca2Mg6Zn3相在阻碍再结晶和精炼粒度结构方面发挥着关键作用,特别是在Mg-Zn-Sn合金中.

关键词:

合金 Mg 合金这是一种Mg-3Zn-Sn/Mn合金.挤出挤出挤出挤出应变硬化指数的应变硬化指数纹理的演变纹理的演变

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