摘要
利用激光熔覆法制备Al2CrFeCox CuNiTi高熵合金涂层,利用带有能谱的扫描电镜(SEM/EDS)、X射线衍射仪、显微/维氏硬度计、磨料磨损试验机、电化学工作站等对Al2CrFeCox CuNiTi高熵合金组织结构进行分析并测试其硬度、耐磨性、耐蚀性。结果表明:Al2CrFeCox CuNiTi高熵合金涂层组织主要由等轴晶组成,等轴晶上分布有纳米尺度的球状粒子;高熵合金涂层主要由FCC+BCC1+BCC2+Laves相组成;随Co含量增多,FCC结构增多,BCC结构减少,Al2CrFeCox CuNiTi高熵合金涂层表面显微硬度及耐磨性降低,硬度最高值为1 013 HV,约为基体的5倍;相对耐磨性最高值为3.77。Al2CrFeCox CuNiTi高熵合金涂层的耐蚀性能优异,Co2.0合金与Q235不锈钢相比,自腐蚀电位正移0.15 V,自腐蚀电流密度降低2个数量级。
The Al2CrFeCoxCuNiTi high-entropy alloy coating was prepared by laser cladding. Scanning electron microscopy with spectroscopy （SEM/EDS）, X-ray diffraction meter, micro/Vickers hardness tester, wear testing machine, and electrochemical workstation were used to test the structure and hardness, wear resistance and corrosion resistance ofAl2CrFeCoxCuNiTi high-entropy alloys. The results show that the main microstructure of Al2CrFeCoxCuNiTi high entropy alloy coating is isometric and nanometer scale globular particles, the coating phase is mainly composed of FCC＋BCCI＋BCC2＋Laves phase; With the increase of the Co content, FCC structure increases, BCC structure decreases, both the coating surface microhardness and relative wear resistance show reducing trend, the value of the highest microhardness and the highest relative wear resistance are of 1 013 HV and 3.77, respectively. The Co2.0 alloy coating shows excellent corrosion resistance, compared with matrix steel Q235, the corrosion potential is shift to positive direction for 0.15 V, the corrosion current density decreases two orders of magnitude.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第5期735-740,共6页
Materials Science and Engineering of Powder Metallurgy
基金
陕西省重点学科建设经费资助项目
