Interdiffusion behaviors between NiCrFe alloy and low-/medium-/high-entropy alloys
Interdiffusion behaviors between NiCrFe alloy and low-/medium-/high-entropy alloys
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DOI：
10.1016/j.jallcom.2021.162711
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发表时间：
2021-11
影响因子：
6.2
通讯作者：
Juan Chen;J. Xiao;Lijun Zhang
中科院分区：
文献类型：
--
作者：
Juan Chen;J. Xiao;Lijun Zhang
制备了6组面心立方固/固扩散偶，包括Ni-Cr-Fe/低熵(纯Ni、NiCo、NiCr和NiCoCr)合金、Ni-Cr-Fe/中熵(CoCrNi)合金和Ni-Cr-Fe/高熵(CoCrFeNi)合金，并测量了它们的成分分布。借助于高通量互扩散系数测定(HitDIC)软件，求取了1473K下面心立方Ni-Co-Cr-Fe系中随浓度变化的互扩散系数和示踪剂扩散系数，并验证了其可靠性。在大多数情况下，D˜C r C r N i>；D˜F e F e N i>；D˜C o C o N i.将NiCo、NiCr、NiCoCr、CoCrNi中熵和CoCrFeNi高熵合金的互扩散系数/示踪剂扩散系数与文献报道的数据进行了综合比较，结果表明，低熵合金的互扩散系数Co、Cr和Fe最大。当采用绝对温度时，Co-Cr-Fe-Ni系HEAs的示踪扩散系数不会出现迟滞现象。
Six groups of fcc solid/solid diffusion couples, including Ni-Cr-Fe/low-entropy (pure Ni, and NiCo, NiCr, and NiCoCr) alloys, Ni-Cr-Fe/medium-entropy (CoCrNi) alloys, and Ni-Cr-Fe/high-entropy (CoCrFeNi) alloys, were prepared, and their composition profiles were experimentally measured. Concentration-dependent interdiffusion and tracer diffusion coefficients in fcc Ni-Co-Cr-Fe system at 1473 K were retrieved with the aid of High-throughput Determination of Interdiffusion Coefficients (HitDIC) software and their reliability was validated. In most cases, D˜ C r C r N i> D˜ F e F e N i> D˜ C o C o N i. The comprehensive comparison between the interdiffusivities/tracer diffusivities in the NiCo, NiCr, NiCoCr low-entropy, CoCrNi medium-entropy, and CoCrFeNi high-entropy alloys and those reported data available in the literatures indicates that the interdiffusivities Co, Cr, and Fe in low-entropy alloys are the largest than those in the other two types of alloys. While the tracer diffusivity in Co-Cr-Fe-Ni HEAs may have no sluggish phenomenon when the absolute temperature is used.