通过微结构继承和改进,强,柔性和层次化的异质状结构合金通过微结构继承和改进
Peijian Shi1,2, Yi Li1, Zhi Li3
1State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferromletallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
概括
研究人员开发了一种快速,低成本的方法,通过创建一个层次化的异质状结构 (HLS) 来增强合金的强度和可塑性. 这种新的方法克服了先进材料中常见的强度-柔性权衡.
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.
- 机械工程 机械工程
背景情况:
- 无处不在的强度-柔性权衡限制了材料性能,特别是在易碎的金属间含有多重主要元素合金 (MPEA) 中.
- 层次的异质性为同时增强强度和延展性提供了微结构解决方案.
- 创建分层异构结构的传统方法通常是昂贵和耗时的.
研究的目的:
- 制定一个高效和低成本的战略,以克服MPEA的强度-柔性权衡.
- 设计和实施一个多层次的微结构继承和改进方法.
- 在Al0.7CoCrFeNi MPEAs中通过一种新的等级异质层状结构 (HLS) 实现卓越的机械性能.
主要方法:
- 在造异质Al0.7CoCrFeNi MPEAs中处理"结构层次前体".
- 简单的滚动和回火形成一个层次性的异质层状结构 (HLS).
- 快速回火 (10分钟) 以实现所需的微观结构特征和特性.
主要成果:
- 在Al0.7CoCrFeNi MPEAs.中成功创建了一个层次化的异质层层结构 (HLS).
- 创纪录的强度-柔性组合在显著减少的处理时间下实现.
- HLS的设计引发了不寻常的变形机制,包括大量的脱位和堆叠故障,导致持续的应变硬化和外部延展.
结论:
- 拟议的微结构继承和改进战略提供了一种高效,快速和低成本的方法,以克服强度-柔性权衡.
- 该方法适用于广泛的结构材料.
- 层次化的HLS设计能够实现多种不同寻常的变形和增强机制,以提高机械性能.
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