在多主元素合金中,利用不稳定性进行工业硬化
Bowen Xu1,2, Huichao Duan3, Xuefei Chen1,2
1State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
Nature materials
|April 11, 2024
概括
研究人员利用VCoNi合金中的过早结来实现超高强度和可塑性. 这种不稳定性控制范式克服了金属材料的强度-柔性悖论.
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.
- 机械工程 机械工程
背景情况:
- 强度-柔性权衡是金属结构材料的持续挑战,特别是多主元素合金.
- 超高产强度通常会导致过早的塑性不稳定性 (部) 和由于异位硬化不足而导致的延展性损失.
- 传统的硬化机制对于表现出极端强度的材料是不够的.
研究的目的:
- 提出和演示一种新的方法来利用VCoNi多主元素合金中的工作硬化过早结.
- 为了克服固有的强度-延展性悖论在超高产率强度.
- 为了在金属材料中实现强度和可塑性之间的优越协同作用.
主要方法:
- 研究了VCoNi多主元素合金对拉力变形的反应.
- 使用Lüders带作为最初的拉力反应来诱导局部部.
- 分析了失位的繁殖和硬化机制,包括森林失位的硬化和与局部化学秩序区域的相互作用.
主要成果:
- 在VCoNi合金中的工作硬化中成功利用了过早的部.
- 确定了双重工作硬化机制 (森林脱位和与化学秩序的相互作用).
- 结合硬化抑制和稳定了部,促进了均的变形.
- 在室温和冷条件下达到2GPa的强度和约20%的可塑性.
结论:
- 建立了一个不稳定性控制范式,用于协同工作硬化.
- 提出的方法有效地克服了超高产度的强度-柔性悖论.
- 这种方法为设计具有特殊机械性能的先进金属材料提供了一个新的策略.
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