铬铁矿粉掺杂对CrFeNiAlSi高熵合金相及性能的影响  

Phase and Properties of CrFeNiAlSi High-Entropy Alloys with Different Content of Chromite Powder

作　　者：李刚[1,2] 温影 于中民 魏巍 蔡畅 卢伟 Li Gang;Wen Ying;Yu Zhongmin;Wei Wei;Cai Chang;Lu Wei(College of Mining,Liaoning Technical University,Fuxin 123000,China;College of Materials Science&Engi-neering,Yingkou Institute of Technology,Yingkou 115000,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]营口理工学院材料科学与工程学院,辽宁营口115000

出　　处：《稀有金属》2022年第12期1556-1566,共11页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51805235);营口理工学院创新团队支持计划资助。

摘　　要：采用铬铁矿粉为掺杂组元,选取与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体系,综合激光烧结高能流密度的特点,利用激光烧结技术制备了CrFeNiAlSi高熵合金复合材料。运用X射线衍射(XRD),扫描电镜(SEM),显微硬度计及摩擦磨损机等试验设备,分析了铬铁矿粉对CrFeNiAlSi高熵合金复合材料物相结构、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:CrFeNiAlSi高熵合金由体心立方(bcc)相组成,掺杂铬铁矿粉后由bcc相、面心立方(fcc)相、金属间化合物Cr_(5)Si_(3)相与铬铁矿相组成。掺杂铬铁矿粉含量为0时,合金显微硬度值为HV 803,合金单位面积磨损量为55.5 mg·cm^(-2)。掺杂铬铁矿粉含量为6%时合金显微硬度值最大,HV为909,合金单位面积磨损量最小,为50.4 mg·cm^(-2)。随着铬铁矿粉含量的增加,高熵合金的密度呈现出下降趋势,而孔隙率则逐渐上升。掺杂铬铁矿粉含量为10%时,合金的密度最小,为3.32 g·cm^(-3),孔隙率最大,达到29.43%。在氧化温度800℃下,随氧化时间延长,合金氧化增质一直呈抛物线趋势缓慢增加,呈现出优异的抗氧化性能。The rapid development of China’s equipment manufacturing industry urgently needs innovative research and development of new materials,especially in the process of moving from a manufacturing power to a smart.High-performance new material composition design and advanced processing and forming technology have become technological breakthroughs.The design idea of high-entropy alloy breaks the conventional composition design idea.The composition of chromite is complex,and there is the phenomenon of isomorphic replacement of the basic components of Cr_(2)O_(3),Al_(2)O_(3),Fe_(2)O_(3),MgO and FeO.Based on the"cocktail"type element blending mechanism of high-entropy alloys,the elemental composition of chromite powder is similar to that of high-entropy alloys.CrFeNiAlSi high-entropy alloy has the problem of insufficient single-phase hard abrasive wear resistance.Doping chromite powder to improve the hardness and wear resistance of the high-entropy alloy.Using chromite powder as the doping component,selecting Al,Cr,Fe,Ni,Si elements similar to the effective components of chromite powder as the high-entropy alloy composition system.CrFeNiAlSi high-entropy alloy composite materials was prepared by laser sintering,which has the characteristics of high energy flow density,short preparation time,energy saving and environmental protection.The effects of chrome powder on phase structure,microstructure,density and porosity,microhardness,wear resistance and high temperature oxidation resistance of CrFeNiAlSi high entropy alloy composites were analyzed by using X-ray diffractometer(XRD),scanning electron microscope(SEM),microhardness tester and wear machine.CrFeNiAlSi high-entropy alloy was composed of body centered cubic(bcc)phase,whose mixing enthalpy was 1.609R.High mixing entropy would promote the formation of multi-component solid solution and inhibit the appearance of intermetallic compounds.The alloy doped with chromite powder was composed of bcc phase,face centered cubic(fcc)phase,intermetallic compound Cr_(5)Si_(3)phase

关 键 词：铬铁矿粉 高熵合金 相结构 耐磨性 抗高温氧化 

分 类 号：TG113[金属学及工艺—物理冶金]