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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
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高强度和可塑性超细颗粒钢的散装方式
Junheng Gao1, Suihe Jiang2, Huairuo Zhang3,4
1Department of Materials Science and Engineering, The University of Sheffield, Sheffield, UK.
Nature
|February 11, 2021
概括
研究人员开发了一种新方法,用于大规模生产具有强度和延展性的超细颗粒钢. 这种新的方法利用铜合金和快速纳米沉来提高材料性能和工业可扩展性.
科学领域:
- 材料科学
- 金属工程
- 纳米技术
背景情况:
- 超细粒钢具有卓越的性和强度,对于轻量化和能源效率至关重要.
- 目前的UFG钢的工业制造受到相变制约和工作硬化不足的限制.
- 现有的UFG钢具有有限的硬化和均延长,限制了它们的实际应用.
研究的目的:
- 开发一种易于批量生产的超细粒度 (UFG) 结构.
- 提高UFG钢的机械性能,特别是强度和可塑性.
- 研究铜合金和纳米沉在谷物精炼和热稳定性中的作用.
主要方法:
- 铁-22Mn-0.6C钢的少量铜合金.
- 在30秒内通过连贯无序的丰富相的微粒纳米沉来处理再结晶.
- 使用Zener固定机制来稳定UFG结构.
主要成果:
- 实现了 800 ± 400 纳米粒度的易于批量生产的 UFG 结构.
- 快速的纳米沉防止了谷物生长,并通过Zener固定增强了热稳定性.
- 获得的UFG钢具有两倍的承压强度 (~710 MPa),45%的均可塑性和~2,000 MPa的抗拉强度.
- 这个过程避免了有害的格子缺陷,如脆性粒子和分离边界.
结论:
- 一种新的,可扩展的工业生产高性能UFG钢的方法被成功演示.
- 微粒纳米沉的方法为提高UFG材料的机械性能提供了可行的策略.
- 这种颗粒精制概念有可能扩展到其他合金系统,为先进的材料应用铺平道路.
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