材料科学
极限抗拉强度
立方晶系
高熵合金
纳米结构
合金
韧性
透射电子显微镜
位错
复合材料
微观结构
延展性(地球科学)
凝聚态物理
纳米技术
蠕动
物理
作者
Longfei Zeng,Luming Zeng,Rui Gao,Chaoping You,Baixiong Liu
出处
期刊:Intermetallics
[Elsevier]
日期:2022-09-01
卷期号:148: 107638-107638
被引量:10
标识
DOI:10.1016/j.intermet.2022.107638
摘要
High/medium-entropy alloys (HEAs/MEAs) with simple single-phase face-centered-cubic (fcc) structures have exceptional tensile ductility and outstanding toughness, but their room-temperature strengths are moderate. Here we introduced a mixed nanostructure, composed of high density nano-scale twins in the form of bundles and nanograins in shear bands, in a single-phase fcc FeCrCoNi HEA by means of cryo-rolling at liquid nitrogen temperature (LNT), which result in a substantial enhancement of tensile strength. The as-prepared nanostructured FeCrCoNi HEA exhibits an ultra-high ultimate tensile strength of ∼1.8 GPa, an elongation-to-failure of ∼10%. The ultra-high strength originates mainly from the effective blockage of dislocation motion by the ultra-high density of internal twin and grain boundaries. The microstructural evolution and formation mechanism of the mixed nanostructure in FeCrCoNi HEA were investigated in detail by transmission electron microscopic characterization.
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