变形诱导的晶体生长或再溶解,以及含纳米晶体的金属玻璃中的晶体诱导的强化或柔性化
Tittaya Thaiyanurak1,2, Saowaluk Soonthornkit1,3, Olivia Gordon4
1Materials Science Program, Oregon State University, Corvallis, OR 97331, USA.
Materials (Basel, Switzerland)
|June 19, 2024
概括
金属玻璃 (MGs) 中的晶体大小逆转了它们的机械性能. 小晶体增加了强度,而较大的晶体提高了柔性,为MG复合材料提供了新的设计可能性.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 金属玻璃 (MGs) 通常在结晶合并后显示强度降低,延展性增加.
- 在MGs中的变形,特别是剪带,可以触发晶体形成或生长.
研究的目的:
- 研究晶体大小对纳米晶体金属玻璃的机械性能和变形行为的影响.
- 为了确定MG-晶体相互作用的确定的趋势是否依赖于大小.
主要方法:
- 在含有纳米晶体的金属玻璃上进行拉伸试验的分子动力学模拟.
- 分析晶体大小,剪切带和变形过程中的机械性质演变之间的相互作用.
主要成果:
- 小晶体 (<剪切带大小) 增强MG强度,并在传播剪切带内溶解.
- 较大的晶体 (>剪切带大小) 以牺牲强度而提高可塑性,在变形过程中增加晶体体积分数.
结论:
- 在MGs中,晶体和变形之间的关系取决于大小,可能会逆转已知的趋势.
- 了解晶体尺寸效应对于定制金属玻璃及其复合材料的机械性能至关重要.
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