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Fabrication of Nanocrystalline AlCoCrFeNi High Entropy Alloy through Shock Consolidation and Mechanical Alloying

机译：通过冲击固结和机械合金化制造纳米晶体铝合金高熵合金

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摘要

High entropy alloys (HEAs) are usually fabricated using arc melting which has the disadvantages of diseconomy, and the limitations in the shape and size of final products. However, recently, quite a large amount of research has been carried out to find the fabrication techniques for HEAs with better properties such as mechanical alloying and rapid solidification. In this paper, an AlCoCrFeNi high entropy alloy was successfully fabricated by the shock consolidation technique. In this method, the starting powders were mixed by mechanical alloying and then the shock wave was imposed to the compacted powders by explosion. High levels of residual stress existed in samples fabricated by the shock consolidation method. Due to this, after fabrication of the sample, heat treatment was used to eliminate the residual stress and improve the mechanical properties. The microstructure of the samples before and after heat treatment were examined by XRD, SEM and electron backscatter diffraction (EBSD). The shock consolidated sample and sample with heat treatment both showed the nano-structure. After heat treatment the hardness of the sample was decreased from 715 HV to the 624 HV, however the failure strength increased, and as expected the ductility of the sample was improved after heat treatment.
机译：高熵合金（HEAS）通常使用电弧熔化制造，其具有不经济的缺点，以及最终产品的形状和尺寸的局限性。然而，最近，已经进行了相当大量的研究，以寻找具有更好的性质，例如机械合金化和快速凝固的制造技术。本文通过冲击合并技术成功地制造了一种AlcocroCeni高熵合金。在该方法中，通过机械合金化混合起始粉末，然后通过爆炸施加对压实粉末的冲击波。通过冲击巩固方法制造的样品中存在高水平的残余应力。因此，在制造样品之后，使用热处理来消除残余应力并改善机械性能。通过XRD，SEM和电子反向散射衍射（EBSD）检查热处理前后样品的微观结构。具有热处理的冲击固结样品和样品均显示纳米结构。热处理后，样品的硬度从715 HV降至624HV，然而，失效强度增加，并且随着预期的预期，热处理后样品的延展性改善。

著录项

  • 期刊名称 Entropy
  • 作者

    Ali Arab; Yansong Guo; Qiang Zhou; Pengwan Chen;

  • 作者单位
  • 年(卷),期 2019(21),9
  • 年度 2019
  • 页码 880
  • 总页数 12
  • 原文格式 PDF
  • 正文语种
  • 中图分类
  • 关键词

    机译：高熵合金;震动整合;Alcocrofeni;纳米晶;

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