摘要
选取与天然铬铁矿粉有效成分相近的Al、Cr、Fe、Ni、Si元素为高熵合金成分,采用激光烧结技术制备CrFeNiAl_(x)Si系高熵合金,研究了Al含量对CrFeNiAl_(x)Si系高熵合金的物相结构、显微组织、密度和孔隙率、显微硬度、耐磨和抗高温氧化性能的影响。结果表明:CrFeNiAlxSi(x=0.2、0.4、0.6、0.8、1.0)系高熵合金由BCC+FCC相构成,随着Al含量的提高FCC相减少;x=0.6的合金硬度最高,为813.3HV;合金的密度降低孔隙率提高,x=0.2的合金密度最大,为4.21 g·cm^(-3),孔隙率最低,为26.46%;x=0.6的合金耐磨性能最佳,磨损率为69.50 mg·cm^(-2);随着Al含量的提高,合金的抗高温氧化性能明显提高。
CrFeNiAl_(x)Si high entropy alloys were prepared via laser sintering with Al,Cr,Fe,Ni,Si and natural ferrochrome ore powder as raw materials.The effect of Al content on the phase structure,microstructure,density and porosity,microhardness,wear resistance and high temperature oxidation resistance of CrFeNiAl_(x)Si high entropy alloys were investigated.The results show that CrFeNiAl_(x)Si(x=0.2,0.4,0.6,0.8,1.0)high-entropy alloys composed of BCC+FCC phase.With the increase of Al content,the amount of FCC phase decreases gradually;when x=0.6,the hardness of the alloy reaches 813.3 HV and the density of the alloy decreases and the porosity increases;when x=0.2,the density of the alloy is4.21 g·cm^(-3) and the porosity is 26.46%;whilst when x=0.6,the wear resistance of the alloy is the best with wear rate of 69.50 mg·cm^(-2);Furthermore,the high temperature oxidation resistance of the alloy was obviously improved with the increasing Al-content.
作者
李刚
温影
于中民
刘囝
熊梓连
LI Gang;WEN Ying;YU Zhongmin;LIU Jian;XIONG Zilian(College of Mines,Liaoning Technical University,Fuxin,123000,China;Yingkou Institute of Technology,Yingkou 115000,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2021年第9期712-720,共9页
Chinese Journal of Materials Research
基金
国家自然科学基金(51805235)
营口理工学院创新团队支持计划(TD202001)
营口理工学院高层次人才科研启动项目(YJRC202014)。
关键词
金属材料
高熵合金
相结构
硬度
抗高温氧化
metallic materials
high entropy-alloy
phase structure
hardness
high temperature oxidation resistance
