CeO2对AlCoCrFeMn高熵合金组织与性能的影响

Effects of CeO2 on Microstructure and Properties of AlCoCrFeMn High Entropy Alloys

通过熔铸法制备了不同CeO2掺杂含量的系列AlCoCrFeMn高熵合金。采用XRD、SEM、显微硬度计和摩擦磨损实验机分别研究了CeO2掺杂对AlCoCrFeMn高熵合金物相结构、显微组织、硬度和耐磨性能的影响。结果表明:AlCoCrFeMn合金由单一的BCC相构成,CeO2含量的添加引起了衍射峰强度的提高,但并未使物相结构发生改变。随着CeO2含量的增加,合金晶粒尺寸减小,晶界更加清晰;同时在枝晶区域发现少量白色颗粒,这是由于稀土元素与其它合金元素间的性质差异较大引起的相分离现象。当CeO2含量为5%时,合金的硬度达674.2 HV、摩擦系数约为0.5,此时,硬度最大和耐磨性最好。

AlCoCrFeMn high entropy alloys doping with different content of CeO2 were prepared by melting casting.The effects of CeO2 doping on the phase structure,microstructure,hardness and wear resistance of AlCoCrFeMn high entropy alloys were investigated by XRD,SEM,microhardness tester and friction and wear tester.The results show that AlCoCrFeMn alloy is composed of single BCC phase.After CeO2 doping,the intensity of the diffraction peak increases,but the phase structure does not change.With the increase of CeO2 content,the grain size of the alloy decreases,and the grain boundaries become clearer.At the same time,a small number of white particles appear in the dendrite region,which is the phenomenon of phase separation caused by the large difference in properties between rare earth element and other alloy elements.When the content of CeO2 is 5%,the hardness of the alloy reaches 674.2 HV,and the friction coefficient is about 0.5,the alloy has the maximum hardness and the best wear resistance.