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Friction-stir welding of a ductile high entropy alloy: microstructural evolution and weld strength

机译：延性高熵合金的摩擦搅拌焊接：组织演变和焊接强度

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摘要

High entropy alloys (HEAs) are a novel subset of metallic systems with complex compositions usually yielding simple phase formation. To verify their potential engineering applications, a novel Co_(16)Fe_(28)Ni_(28)Cr_(28) HEA with a low content of expensive Co was developed and its welding characteristics through friction-stir welding (FSW) were investigated. The HEA shows a stable face-centered-cubic (FCC) structure with an excellent ductility of about 70%. The microstructural evolution during FSW was dominated by discontinuous recrystallization through grain bulging and the B/B {112} < 110 > shear texture formed in the stir zone (SZ). A white band (WB) containing W-rich and Cr-rich phases was detected in the SZ. The WB exhibited refined grains compared with the normal SZ, which may be associated with the particle-stimulated nucleation (PSN). The present understanding of the microstructural evolution during FSW of HEAs may help tailor the weld properties to pave the way for their engineering applications.
机译：高熵合金（HEA）是金属系统的一个新子集，具有复杂的成分，通常会形成简单的相。为了验证其潜在的工程应用，开发了一种新型的Co_（16）Fe_（28）Ni_（28）Cr_（28）HEA，其具有低含量的昂贵Co，并通过搅拌摩擦焊（FSW）研究了其焊接特性。 HEA显示稳定的面心立方（FCC）结构，延展性约为70％。 FSW期间的微观组织演变主要是由于晶粒膨大引起的不连续再结晶和在搅拌区（SZ）中形成的B / B {112} <110>剪切织构。在SZ中检测到包含富W和富Cr相的白带（WB）。与正常的SZ相比，WB显示出细化的晶粒，这可能与颗粒刺激形核（PSN）有关。目前对HEA的FSW过程中微观结构演变的了解可能有助于定制焊接性能，为其工程应用铺平道路。

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  • 来源
    《Materials Science and Engineering》 |2018年第10期|524-532|共9页
  • 作者

    Z.G. Zhu; Y.F. Sun; F.L. Ng; M.H. Goh; P.K. Liaw; H. Fujii; Q.B. Nguyen; Y. Xu; C.H. Shek; S.M.L. Nai; J. Wei;

  • 作者单位

    Singapore Institute of Manufacturing and Technology, Singapore,Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China;

    Joining and Welding Research Institute, Osaka University, Japan;

    Singapore Institute of Manufacturing and Technology, Singapore;

    Singapore Institute of Manufacturing and Technology, Singapore;

    Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;

    Joining and Welding Research Institute, Osaka University, Japan;

    Singapore Institute of Manufacturing and Technology, Singapore;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China;

    Singapore Institute of Manufacturing and Technology, Singapore;

    Singapore Institute of Manufacturing and Technology, Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High entropy alloys; Friction-stir welding; Microstructural evolution; Mechanical properties; Recrystallization;

    机译：高熵合金;搅拌摩擦焊;微观结构演变;机械性能重结晶;

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