B含量对CrFeCoNiTi0.6高熵合金显微组织和性能的影响

Effects of B content on microstructure and properties of CrFeCoNiTi0.6 high-entropy alloy

高熵合金是一种新型的固溶强化金属材料,具有良好的力学性能。本文采用机械合金化和放电等离子烧结的方法制备CrFeCoNiTi0.6Bx(x=0,0.025,0.050,0.075,0.100,0.125)高熵合金。通过X射线衍射分析,扫描电镜观察和能谱分析以及维氏硬度测试和压缩强度测试等,研究B含量对CrFeCoNiTi0.6系高熵合金的微观组织和性能的影响。结果表明,CrFeCoNiTi0.6B高熵合金由FCC结构和简单四方晶系相构成,同时包含硼化物,当x=0.125时,合金由FCC结构转变为FCC+BCC结构。由于B元素的加入,合金综合力学性能显著提高。当x=0.1时,合金同时具有最高的硬度和压缩强度,分别为207.3 HV和813.9 MPa.

High entropy alloy is a new kind of solid solution reinforced metal material with good mechanical properties.CrFeCoNiTi0.6Bx(x=0,0.025,0.050,0.075,0.100,0.125)high entropy alloy was successfully prepared by mechanical alloying and spark plasma sintering.The microstructure of the high-entropy alloy was analyzed by X-ray diffraction analysis,scanning electron microscope observation and energy spectrum analysis.The properties of the high-entropy alloy were analyzed by Vickers hardness test and compression strength test.The effects of B content on the microstructure and properties of CrFeCoNiTi0.6 series high-entropy alloy were also investigated.The results show that CrFeCoNiTi0.6B high-entropy alloy is composed of FCC structure,simple tetragonal system and boride.When x is 0.125,the alloy structure changes from FCC structure to FCC+BCC structure.The mechanical properties of the alloy are significantly improved because of the addition of B.When x is 0.1,the alloy has the highest hardness of 207.3 HV and compressive strength of 813.9 MPa.