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Phase stability and mechanical properties of AlHfNbTiZr high-entropy alloys

机译：AlHfNbTiZr高熵合金的相稳定性和力学性能

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摘要

Refractory high-entropy alloys (HEAs) have potential to be high temperature structural materials, but poor ductility and phase stability have been remaining the key issues for their application. In this paper, the phase compositions, phase stability and mechanical properties of Alx(HfNbTiZr)100-x(x = 0, 3, 5, 7, 10 and 12 in atomic percent) HEAs have been systematically studied. It has been shown that after cold-worked and heat-treated at 1273 K for 0.5 h, all the HEAs formed a single solid solution (SS) phase with BCC structure. For the HEAs with more than 7% Al, a (Al, Zr)-rich phase with hexagonal structure was precipitated when aged at 873 K. The yield strength increases linearly with the content of Al for the SS treated HEAs. Typically, Al5(HfNbTiZr)95exhibits the fracture strength and elongation of 915.2 MPa and 31.5%, respectively, resulting in the product of strength and elongation up to 28828 MPa%, which is comparable to that of FCC HEAs with excellent ductility. The strengthening mechanism for these HEAs has been discussed based on the solid solution strengthening effects. Atomic size effect and electron concentration are considered to attribute to the rapid solid solution strengthening. And dislocation substructure evolution was also evaluated for current HEAs.
机译：耐火高熵合金（HEA）有可能成为高温结构材料，但延展性和相稳定性差仍然是其应用的关键问题。本文系统研究了Alx（HfNbTiZr）100-x（x =，0、3、5、7、10和12原子百分数）HEA的相组成，相稳定性和力学性能。结果表明，经过冷加工并在1273 K下热处理0.5workh，所有的HEA都形成了具有BCC结构的单一固溶体（SS）相。对于Al含量超过7％的HEA，在873 K时效时会析出具有六方结构的（Al，Zr）富集相，屈服强度随SS处理的HEA的Al含量线性增加。通常，Al5（HfNbTiZr）95的断裂强度和伸长率分别为915.2 MPa和31.5％，导致强度和伸长率的乘积高达28828 MPa％，与具有出色延展性的FCC HEA相当。基于固溶强化作用，讨论了这些HEA的强化机理。原子尺寸效应和电子浓度被认为归因于快速固溶强化。并且还评估了当前HEA的位错亚结构演变。

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  • 来源
    《Materials Science and Engineering》 |2018年第may2期|249-259|共11页
  • 作者

    Yidong Wu; Jiajia Si; Deye Lin; Tan Wang; William Yi Wang; Yandong Wang; ZiKui Liu; Xidong Hui;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;

    CAEP Software Center for High Performance Numerical Simulation, Institute of Applied Physics and Computational Mathematics;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;

    Department of Materials Science and Engineering, The Pennsylvania State University;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-entropy alloys; Solid solution; Phase stability; Strength; Ductility;

    机译：高熵合金固溶体相稳定性强度延展性;

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