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王磊磊, 刘婷, 段舒尧, 占小红. 元素分布对FeCoCrNi高熵合金涂层微观组织的影响[J]. 焊接学报, 2021, 42(11): 57-64. DOI: 10.12073/j.hjxb.20210707004
引用本文: 王磊磊, 刘婷, 段舒尧, 占小红. 元素分布对FeCoCrNi高熵合金涂层微观组织的影响[J]. 焊接学报, 2021, 42(11): 57-64. DOI: 10.12073/j.hjxb.20210707004
WANG Leilei, LIU Ting, DUAN Shuyao, ZHAN Xiaohong. Effect of element distribution on the microstructure of FeCoCrNi high entropy alloy coating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(11): 57-64. DOI: 10.12073/j.hjxb.20210707004
Citation: WANG Leilei, LIU Ting, DUAN Shuyao, ZHAN Xiaohong. Effect of element distribution on the microstructure of FeCoCrNi high entropy alloy coating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(11): 57-64. DOI: 10.12073/j.hjxb.20210707004

元素分布对FeCoCrNi高熵合金涂层微观组织的影响

Effect of element distribution on the microstructure of FeCoCrNi high entropy alloy coating

  • 摘要: 聚焦于激光熔覆高熵合金表面强化技术,开展了6 mm厚TC4钛合金板材表面激光熔覆FeCoCrNi高熵合金涂层的研究. 首先通过X射线衍射(XRD)对FeCoCrNi高熵合金熔覆层进行物相分析,探究其相组成. 随后,利用金相显微镜和场发射扫描电子显微镜表征手段,探究了熔覆层以及其与TC4基体结合界面处的微观组织形态及物相分布. 结果表明,Ti,Ni组合和Ti,Co组合具有最大的负混合焓(∆Hmix),因此易造成部分物相中(Ti,Ni,Co)的富集,而其周围相中则会呈现出(Fe,Cr)的富集. 结合界面上部和下部主要由灰色的柱状晶组成,中部区域主要由白色网状组织和灰色收缩孔洞组成.

     

    Abstract: Laser cladding of FeCoCrNi high entropy alloy coating on the surface of 6 mm thick TC4 titanium plate was studied by focusing on the surface strengthening technology of laser cladding high entropy alloy. Firstly, the phase analysis of the FeCoCrNi high entropy alloy cladding layer was carried out by X-ray diffraction to explore its phase composition. Then, the microstructure and phase distribution of the cladding layer and its interface with TC4 substrate were investigated by metallographical microscope and field emission scanning electron microscope. The results show that Ti and Ni, Ti and Co have the most significant negative mixing enthalpy (∆Hmix), so it is easy to cause the enrichment of (Ti, Ni, Co) in some phases, and the enrichment of (Fe, Cr) in the surrounding phases. The upper and lower part of the bonding interface is mainly composed of gray columnar grains, and the middle part is mainly composed of white reticulum structure and gray shrinkage cavity.

     

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