Wang Rongguang, Kamada Sohei
Department of Mechanical Systems Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193, Japan.
Graduate School of Science and Technology, Hiroshima Institute of Technology, Hiroshima 731-5193, Japan.
Materials (Basel). 2024 Sep 29;17(19):4793. doi: 10.3390/ma17194793.
The mechanical properties and electrochemical stability of high-entropy alloys are substantially affected by their composition distribution and crystal structure. However, the details concerning the conditions of milling and sintering for sintered alloys have rarely been reported. In this work, a series of CrMnFeCoNi alloys were fabricated by ball milling and spark plasm sintering for different periods. Their crystal structure, density, hardness, and corrosion resistance were investigated. As a result, a partial alloying of Cr, Mn, Fe, Co, and Ni was achieved by ball milling. However, Cr-rich particles, including Mn, were formed in the milled powders. The sintered alloys inherited the Cr-rich particles to form Cr-rich zones. The formation and change of chromium carbide were also confirmed in sintered alloys. Extended milling or sintering to 12 h achieved high hardness and corrosion resistance for the sintered alloys. The Cr-rich zones showed high hardness and Kelvin potential, which affect both the hardness and the corrosion resistance.
高熵合金的力学性能和电化学稳定性受其成分分布和晶体结构的显著影响。然而，关于烧结合金的球磨和烧结条件的详细信息鲜有报道。在本工作中，通过不同时长的球磨和放电等离子烧结制备了一系列CrMnFeCoNi合金。研究了它们的晶体结构、密度、硬度和耐腐蚀性。结果表明，通过球磨实现了Cr、Mn、Fe、Co和Ni的部分合金化。然而，在研磨粉末中形成了富含Cr的颗粒，包括Mn。烧结合金继承了富含Cr的颗粒，形成了富Cr区。在烧结合金中也证实了碳化铬的形成和变化。延长球磨或烧结至12小时可使烧结合金获得高硬度和耐腐蚀性。富Cr区显示出高硬度和开尔文电势，这对硬度和耐腐蚀性均有影响。
