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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of a Refractory CoCrMoNbTi High-Entropy Alloy
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Microstructure and Mechanical Properties of a Refractory CoCrMoNbTi High-Entropy Alloy

机译：难治性Cocrmnbti高熵合金的微观结构和力学性能

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摘要

In this work, a new refractory high-entropy alloy, the Co-Cr-Mo-Nb-Ti system, was proposed as a family of candidate materials for high-temperature structural applications. CoCrMoNbTix (x values in terms of molar ratios, x = 0, 0.2, 0.4, 0.5 and 1.0) alloys were prepared by vacuum arc melting. The effects of variations in the Ti content on the phase constituents, microstructure and mechanical properties of the alloys were investigated using x-ray diffractometry, scanning electron microscopy equipped with energy-dispersive x-ray spectroscopy and compressive testing. The results showed that the CoCrMoNbTi0.4 alloy possessed a typical cast dendritic microstructure consisting of a single body-centered cubic (BCC) solid solution. Laves phases (Cr2Nb and Co2Ti) were formed in other alloys with different Ti contents. The results were discussed in terms of the mixing enthalpy, atomic size difference, electronegativity difference and valance electron concentrations among the elements within alloys. The alloy hardness exhibited a slightly decreasing trend as the Ti content increased, resulting from the coarser microstructure and reduced amount of Laves phases. Augmented Ti content increased the compressive strength, but decreased the ductility. Particularly, for the CoCrMoNbTi0.2 alloy, the hardness, compressive strength and fracture strain were as high as 916.46 HV0.5, 1906 MPa and 5.07%, respectively. The solid solution strengthening of the BCC matrix and the formation of hard Laves phases were two main factors contributing to alloy strengthening.
机译：在这项工作中，提出了一种新的耐火高熵合金，CO-CR-MO-NB-TI系统，作为高温结构应用的候选材料系列。通过真空熔融制备Cocrmenbtix（X值，摩尔比，X = 0,0.2,0.4,0.5和1.0）合金。使用X射线衍射法研究了Ti含量对合金的相成分，微观结构和机械性能的影响，扫描电子显微镜和压缩测试。结果表明，CocrMnBti0.4合金具有由单体中心立方（BCC）固溶体组成的典型铸造树突微观结构。在具有不同Ti含量的其他合金中形成Laves阶段（CR2NB和CO2TI）。结果在合金中的元素中的元素中的混合焓，原子尺寸差，电信差和算子浓度方面讨论。随着Ti含量的增加，合金硬度表现出略微降低的趋势，由较粗糙的微观结构和疏浚量减少。增强的Ti含量提高了抗压强度，但降低了延展性。特别是，对于Cocrmonbti0.2合金，硬度，抗压强度和断裂菌株分别高达916.46 HV0.5,1906MPa和5.07％。强化BCC基质的固体溶液和硬熔炉阶段的形成是有助于合金强化的两个主要因素。

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