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通过等级排序的超强和可伸缩的中合金
Lei Gu1, Yonghao Zhao1,2, Yong Li1
1Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Science advances
|May 29, 2024
概括
研究人员通过引入有序的金属间相,开发出一种具有异常强度和可塑性的新型中等合金 (MEA). 这种三相合金设计为创建先进结构材料提供了一个有前途的途径.
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.
- 晶体学 晶体学是指结晶学.
背景情况:
- 具有长距离有序相的高和中合金 (HEAs/MEAs) 由于晶体结构脆弱,通常具有较差的可塑性.
- 开发具有高强度和柔性合金仍然是材料工程中的一个重大挑战.
研究的目的:
- 设计一个强化的单相面中心立方体 (fcc) Ni2CoFeV中合金 (MEA).
- 通过对金属间相的等级顺序来实现抗拉强度和可塑性的优越组合.
主要方法:
- 通过等级排序引入三角 κ 和立方 L12 间金属相到单相 fcc Ni2CoFeV MEA 中.
- 描述了由此产生的三相合金的微观结构和机械性能,包括在室温下抗拉强度和可塑性.
主要成果:
- 三相MEA实现了超过1.6GPa的超高拉伸强度和30%的优异可塑性.
- 在 κ 阶段观察到异位多重滑动和堆叠故障 (SFs) 的同时激活.
- 确定了纳米SF网络,Lomer-Cottrell锁,以及在合的L12和fcc阶段的高密度位移,有助于增强应变硬化.
结论:
- 层次顺序策略成功创建了一个三相MEA,具有显著的强度-柔性协同作用,超过了大多数报告的HEAs/MEAs.
- 这项工作提供了一个有前途的原型,用于设计超强和柔性结构材料,通过利用层次秩序阶段.
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