原位合成碳化物增强高熵合金微观结构和耐磨损行为研究  

Study on Microstructure and Wear Resistance Behavior of In-Situ Synthesized Carbide Reinforced High Entropy Alloy

作　　者：韩云飞 王小荣[1] 

机构地区：[1]兰州交通大学机电工程学院,甘肃 兰州

出　　处：《材料科学》2024年第5期614-623,共10页Material Sciences

摘　　要：选用AlMoZrSi高熵合金粉末和Cr3C2合金粉末作为熔覆原材料。利用等离子熔覆技术在TC11钛合金表面制备原位合成MC型碳化物增强熔覆层,并对其微观组织和物相特征进行表征。此外,还和基体对比研究了显微硬度和耐磨损性能。结果显示:AlMoZrSi(Cr3C2)x (x = 7.5%, 10%)高熵合金熔覆层均由BCC基体相和原位合成的MC型碳化物增强相构成。根据显微硬度和磨损率测试显示:AlMoZrSi(Cr3C2)x (x = 7.5%, 10%)高熵合金的平均显微硬度分别是846.33 HV,1009.27 HV,分别是基体显微硬度390.3 HV的2.17和2.56倍,磨损率分别为2.176 × 10−7 mm3/N/m和1.979 × 10−7 mm3/N/m,相较于基体分别提高了19.2%和26.5%。AlMoZrSi(Cr3C2)0.1高熵合金熔覆层具有优异的综合力学性能。AlMoZrSi high entropy alloy powder and Cr3C2 alloy powder were selected as cladding raw materials. The in-situ synthesized MC carbide reinforced cladding layer was prepared on the surface of TC11 titanium alloy by plasma cladding technology, and its microstructure and phase characteristics were characterized. In addition, the microhardness and wear resistance were also studied in comparison with the matrix. Results show: The cladding layers of AlMoZrSi(Cr3C2)x (x = 7.5%, 10%) high-entropy alloys are composed of BCC matrix phase and in-situ synthesized MC-type carbide reinforced phase. According to the microhardness and wear rate test, it is shown that: the average microhardness of AlMoZrSi(Cr3C2)x (x = 7.5%, 10%) high entropy alloys are 846.33 HV and 1009.27 HV, which are 2.17 and 2.56 times of the matrix microhardness 390.3 HV, respectively. The wear rates are 2.176 × 10−7 mm3/N/m and 1.979 × 10−7 mm3/N/m, which are 19.2% and 26.5% higher than that of the matrix, respectively. The AlMoZrSi(Cr3C2)0.1 high-entropy alloy cladding layer exhibits excellent comprehensive mechanical properties.

关 键 词：等离子熔覆技术 原位合成 显微硬度 摩擦磨损 

分 类 号：TG1[金属学及工艺—金属学]