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

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

作　　者：Sarah HEDYA Lamiaa MOHAMED Ghalia GABER Omayma ELKADY Hassan MEGAHED Shimaa ABOLKASSEM 

机构地区：[1]Mechanical Design and Production Engineering Department,Faculty of Engineering,Cairo University,Giza 12613,Egypt [2]Mining,Petroleum and Metallurgical Engineering Department,Faculty of Engineering,Cairo University,Giza 12613,Egypt [3]Department of Chemistry,Faculty of Science(Girls),Al-Azhar University,P.O.Box:11754,Yousef Abbas Str.,Nasr City,Cairo,Egypt [4]Powder Technology Division,Manufacturing Technology Institute,Central Metallurgical R&D Institute,P.O.Box.87,Helwan 11421,Cairo,Egypt

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2648-2664,I0001,共18页中国有色金属学报（英文版）

摘　　要：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 H_(2)SO_(4),HNO_(3),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.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H_(2)SO_(4)、HNO_(3)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FiNiCrCoSi0.3合金具有更小,更少的蚀坑,和优异的显微组织。

关 键 词：FeNiCrCoSi_(x)alloy FeNiCrCoTi_(x)alloy high entropy alloys powder metallurgy corrosion behavior 

分 类 号：TF125[冶金工程—粉末冶金] TG139[冶金工程—冶金物理化学]