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Achieving ultra-high strength in a face-centered-cubic FeCrCoNi high entropy alloy through dense nanotwins bundles structure prepared by cryo-rolling
Intermetallics ( IF 4.4 ) Pub Date : 2022-06-15 , DOI: 10.1016/j.intermet.2022.107638
Longfei Zeng, Luming Zeng, Rui Gao, Chaoping You, Baixiong Liu

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.



中文翻译:

通过低温轧制致密的纳米孪晶束结构实现面心立方 FeCrCoNi 高熵合金的超高强度

具有简单单相面心立方 (fcc) 结构的高/中熵合金 (HEAs/MEA) 具有出色的拉伸延展性和出色的韧性,但它们的室温强度适中。在这里,我们通过液氮温度 (LNT) 的低温轧制在单相 fcc FeCrCoNi HEA 中引入了一种混合纳米结构,该结构由束形式的高密度纳米级孪晶和剪切带中的纳米晶粒组成,结果大大提高了抗拉强度。所制备的纳米结构 FeCrCoNi HEA 具有 1.8 GPa 的超高极限拉伸强度,10% 的断裂伸长率。超高强度主要来源于超高密度的内部孪晶和晶界有效阻挡位错运动。

更新日期:2022-06-17
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