一种在现场形成的基于Ti的散装金属玻璃复合材料的拉伸变形机制
Haiyun Wang1, Na Chen1, Huanwu Cheng1
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Materials (Basel, Switzerland)
|September 28, 2024
概括
这项研究揭示了基于的散装金属玻璃复合材料 (BMGMC) 的新变形机制. 它涉及剪切带,无形化和结构过渡,增强可塑性并为材料设计提供见解.
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.
- 复合材料 复合材料 复合材料
背景情况:
- 基于的散装金属玻璃复合材料 (BMGMCs) 具有转移稳定的β相,通过相变或结合,显示出增强的可塑性.
- 这些材料中精确的变形微机制仍在争论中.
研究的目的:
- 在一个特定的Ti-based BMGMC (Ti42.3Zr28Cu8.3Nb4.7Ni1.7Be15 at%) 中研究一种新的变形机制.
- 阐明有助于塑料变形超出屈服的协同作用.
主要方法:
- 先进的电子显微镜被用来分析微结构在拉伸测试后.
- 在玻璃状矩阵内,树分布和大小的微观结构特征.
主要成果:
- BMGMCs表现出有形的变形,折断强度约为1710 MPa,应变率约为7.1%,以及应变硬化.
- 塑料变形涉及协同剪切带,局部无形化,以及BCC (β-Ti) 到HCP (α-Ti) 的结构过渡.
- 局部无形化是由于剪带传播期间的高应变率导致的.
- 由于累积的压力,BCC向HCP的过渡是由累积的压力驱动的.
结论:
- 鉴定的协同变形机制增强了对基于Ti的BMGMC行为的理解.
- 结果为设计具有更高性能的先进材料提供了洞察力.
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