在金属玻璃中,从应变软化过渡到应变硬化
Yongwei Wang1, Guangping Zheng2, Mo Li3
1Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China.
Nanomaterials (Basel, Switzerland)
|March 13, 2026
概括
这项研究通过优化自由体积分布来增强金属玻璃 (MGs),将脆性行为转换为应变硬化. 这提高了结构应用的性和强度.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算材料科学科学 计算材料科学
背景情况:
- 金属玻璃 (MGs) 具有出色的机械性能,但由于剪带 (SB) 传播,其塑性和性较差.
- 目前的微结构工程,就像纳米玻璃一样,旨在改善SB的扩散,但在增强抗拉强度和性方面表现出有限的成功.
- 很少报道MG微支柱的拉伸应变硬化,这突出了理解它们的变形行为的关键差距.
研究的目的:
- 研究优化金属玻璃中自由体积分布的潜力,以诱导应变硬化.
- 探索从应变软化过渡到应变硬化及其对断裂模式的影响.
- 为设计具有增强性和机械性能的MG提供见解.
主要方法:
- 利用有限元模拟来建模金属玻璃的微和纳米柱样本.
- 在模拟的微观结构中优化了自由体积的统计和空间分布.
- 系统地分析了在拉伸负荷下变形机制和断裂模式转换.
主要成果:
- 梯度结构修改,通过优化自由体积分布,增加产后强度和平均触角模量来实现.
- 在模拟的金属玻璃微柱中,成功诱导了从应变软化向应变硬化行为的过渡.
- 观察到从塑料骨折到脆性骨折的同时过渡,与异构的微观结构及其演变有关.
结论:
- 优化自由体积分布是一种可行的策略,可以在金属玻璃中实现应变硬化.
- 不同质的微结构及其演变在控制变形和断裂机制方面发挥着至关重要的作用.
- 这些发现为设计具有优越性和强度的先进金属玻璃提供了一条道路,用于结构应用.
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