热过程中双相Mg-8.3Li-3.1Al-1.09Si合金的微结构演变和强化机制
Ying Wang1, Guangying Wu1, Bingbing Liang1
1School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.
Materials (Basel, Switzerland)
|May 25, 2024
概括
热Mg-Li-Al-Si合金通过颗粒精炼和脱位硬化提高了强度. 在553K的三通过程中,实现了323.66 MPa的最高最终抗拉强度 (UTS).
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.
- 机械工程 机械工程
背景情况:
- - (Mg-Li) 合金是一种轻质材料,具有各种应用潜力.
- 了解这些合金中的强化机制对于优化它们的机械性能至关重要.
研究的目的:
- 为了研究双相Mg-8.3Li-3.1Al-1.09Si合金的热工艺.
- 为了阐明成Mg-Li合金中的强化机制.
主要方法:
- 热工艺,每次经过控制的厚度减小.
- 微结构分析以观察相变和粒度演变.
- 机械测试以确定最终抗拉强度 (UTS).
主要成果:
- 最高的323.66±19.89MPa的UTS是在553K的三通过程中获得的 (每个通道减少30%).
- 强度归因于第二阶段 (Mg2Si,AlLi) 强化,颗粒精炼 (平均再结晶的颗粒大小为0.27μm),脱位强化和负载转移.
- 在α-Mg阶段的脱位强化增强了强度,但降低了可塑性.
- Mg2Si和AlLi相精炼并形成硬相,半连贯接口促进负载转移.
结论:
- 热工艺显著提高了Mg-Li-Al-Si合金的强度.
- 微观结构特征的组合,包括细粒和分散硬相,有助于合金的改善机械性能.
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