CoCrFeMnNi高熵合金作为中间层的Cu/304不锈钢扩散连接研究
收稿日期: 2019-11-25
修回日期: 2020-02-07
网络出版日期: 2020-05-07
基金资助
国家自然科学基金项目(51541104);江苏省研究生科研与实践创新计划项目(KYCX19-1674)
Diffusion Bonding of Copper and 304 Stainless Steel with an Interlayer of CoCrFeMnNi High-Entropy Alloy
Received date: 2019-11-25
Revised date: 2020-02-07
Online published: 2020-05-07
Supported by
National Natural Science Foundation of China(51541104);Postgraduate Research and Practice Innovation Program of Jiangsu Province(KYCX19-1674)
将CoCrFeMnNi高熵合金作为中间层，采用真空固态扩散方法实现Cu/304不锈钢的连接，通过SEM、EDS以及显微硬度测试，研究温度对扩散反应机理及性能的影响，采用Fick第二定律计算Cu/Fe原子在高熵合金中的扩散系数，借助XRD以及高熵合金中固溶体相形成判据分析扩散界面的相组成。结果表明：在800~900 ℃下，高熵合金与Cu和304不锈钢分别实现了稳固连接，界面处发生了元素的互扩散，随着温度的升高，Cu/Fe在高熵合金中的平均扩散系数增加；Cu/CoCrFeMnNi高熵合金和CoCrFeMnNi高熵合金/304不锈钢扩散界面处均未形成脆性金属间化合物；扩散界面处硬度呈连续变化趋势。研究表明，CoCrFeMnNi高熵合金是一种可用于Cu/304不锈钢异种材料扩散连接的阻挡层材料。
丁文 , 王小京 , 刘宁 , 秦亮 . CoCrFeMnNi高熵合金作为中间层的Cu/304不锈钢扩散连接研究[J]. 金属学报, 2020 , 56(8) : 1084 -1090 . DOI: 10.11900/0412.1961.2019.00404
During the dissimilar materials bonding of copper and 304 stainless steel, micro-voids and micro-cracks can propagate into the bond region because of Kirkendall effect, and have a strong impact on the mechanical and physical properties of conjunct. Copper and 304 stainless steel was bonded by utilizing vacuum solid-state diffusion method with an interlayer of CoCrFeMnNi high-entropy alloy, and the influence of temperature on diffusion reaction mechanism and properties was investigated by using SEM, EDS and microhardness test. The second Fick's law was adopted to calculate the diffusion coefficient of Cu/Fe in CoCrFeMnNi high-entropy alloy. The phase components of the diffusion interface were detected by XRD, and the famous phase-selection-criteria was also used to discuss the phase formation. The results showed that the diffusion interface was well bonded and all the elements diffused mutually at the temperature range of 800~900 ℃, the diffusion rate of Cu/Fe in CoCrFeMnNi high-entropy alloy was increased with the increasing temperature, and no intermetallic compounds were detected at the diffusion interface, and the microhardness increased continuously near the diffusion interface. It was investigated that CoCrFeMnNi high-entropy alloy can be used as an effective diffusion barriers for dissimilar materials bonding of Cu/304 stainless steel.
Key words： high-entropy alloy; vacuum diffusion; diffusion rate; reaction mechanism
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