Mechanical and tribological performance of AlCr_(0.5)NbTa_(x)Ti_(4-x)(x=0,0.5,1)refractory high-entropy alloys  

作　　者：Haozhe Li Xiaolin Li Chi Jin Qian Li Qiang Ma Ke Hua Haifeng Wang Weimin Liu 

机构地区：[1]State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Journal of Materials Science & Technology》2023年第25期241-253,共13页材料科学技术（英文版）

基　　金：support from the National Key Research and Development Program(No.2022YFB3705300);National Natural Science Foundation of China(Grant No.52004224);Fundamental Research Funds for the Central Universities of China(No.3102019JC001).

摘　　要：The tribological behavior of AlCr_(0.5)NbTa_(x)Ti_(4-x)(x=0,0.5,and 1)refractory high-entropy alloys was systematically investigated from room temperature to 800℃.The relationship between the alloy composition,microstructure,mechanical properties,and tribological performance was analyzed.The results show that all three alloys have a body-centered cubic(bcc)single-phase structure.The Ta addition enhances solid solution strengthening and increases the melting point that would resist high-temperature thermal softening.As a result,high-temperature strength is enhanced considerably,the coefficients of friction(COF)and wear rates of the alloys are reduced considerably at elevated temperatures,demonstrating excellent friction-reducing and anti-wear properties,e.g.,the COF and wear rate of AlCr_(0.5) NbTaTi_(3) alloy at 800℃ are 0.34 and 4.40×10^(-7) mm^(3) N^(-1) m^(-1),respectively.The excellent wear resistance at high temperatures can be attributed to the formation of an oxide-tribo layer(Ta_(2)O_(5) and TiO_(2))with ultrafine-grained layers and good high-temperature mechanical properties.

关 键 词：Refractory high entropy alloys High temperature Mechanical properties Wear resistance Oxide-tribo layer 

分 类 号：TG139[一般工业技术—材料科学与工程]