添加Si/Ti对粉末冶金FiNiCrCo高熵合金物理力学和化学性能的影响（英文）

用粉末冶金法制备FiNiCrCoSi_x和FiNiCrCoTi_x高熵合金(HEAs)。其中x为0、0.3%、0.6%和0.9%(质量分数)。所有合金中均形成均匀分布的固溶体。与FiNiCrCo高熵合金相比，加入Si和Ti后，合金的密度和硬度提高，研究合金在不同载荷下的磨损率。结果表明，含0.3%Si和0.9%Ti的高熵合金磨损率最低。用XRD、SEM和EDX研究HEAs的相组或、晶粒尺寸和显微组织。通过H₂SO₄、HNO₃和HCl溶液浸泡实验，研究Si和Ti含量对烧结态FiNiCrCoSi_x和FiNiCrCoTi_x HEAs腐蚀行为和表面形貌的影响。在样品表面观察到不同尺寸的均匀腐蚀和局部点烛，且FiNiCrCoSi_0.3合金具有更小，更少的蚀坑，和优异的显微组织

Effect of Si/Ti additions on physico-mechanical and chemical properties of FeNiCrCo high entropy alloys manufactured by powder metallurgy technique

FeNiCrCoSi_x and FeNiCrCoTi_x (x=0, 0.3, 0.6, and 0.9 wt.%) high entropy alloys (HEAs) were prepared via the powder metallurgy technique. A homogenous distribution of the elements in all alloys due to the formation of a solid solution phase is observed. The density and hardness of the prepared HEAs are improved by Si and Ti additions, compared to FeNiCrCo HEA. The wear rate of the prepared alloys was studied at different loads and the results indicate that the alloys that contain 0.3 wt.% Si and 0.9 wt.% Ti have the lowest wear rates. X-ray diffraction, SEM, and EDX were used to understand the phases, grain sizes, and microstructures in different investigated HEAs. The effects of Si and Ti content on the corrosion behavior and surface morphologies of sintered FeNiCrCoSi_x and FeNiCrCoTi_x HEAs were studied by immersion in H₂SO₄, HNO₃, and HCl solutions. Uniform corrosion and localized pitting are observed in different sizes in the corrosive media used. Because of the smaller pit size and the reduced pit density, the FeNiCrCoSi_0.3 HEA has an excellent microstructure.