CoCrCu_(0.5)FeTi_(0.5)Al_(x)高熵合金组织与力学性能的研究  

Preparation of CoCrCu_(0.5)FeTi_(0.5)Al_(x) high-entropy alloy by vacuum arc sintering

作　　者：秦忠 李新梅[1] 田志刚 王根 QIN Zhong;LI Xinmei;TIAN Zhigang;WANG Gen(School of Mechanical Engineering, Xinjiang University, Urumqi 830047,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830047

出　　处：《功能材料》2021年第11期11189-11194,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51865055)。

摘　　要：为了研究Al含量对高熵合金CoCrCu_(0.5)FeTi_(0.5)Al_(x)高熵合金组织及力学性能的影响,通过真空电弧炉熔炼CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0、0.2、0.4、0.6、0.8、1.0)高熵合金。利用X射线衍射仪测量合金的晶体结构,采用扫描电镜观察合金微观组织,利用维氏显微硬度计和万能试验机测试合金的显微硬度和压缩力学性能。结果表明,CoCrCu_(0.5)FeTi_(0.5)Al_(x)由FCC相和BCC相混合组成。随Al含量的增加,硬度逐渐上升,当x=0时硬度最小为323.61 Hv,在x=1时最大为764.91 Hv;合金压缩塑性先减小后增大,抗压强度先增大后减小,当x=0时,其塑性最好,塑性变形达到了32.08%,x=0.2时塑性最差,塑性变形仅有5.99%。在增加Al的合金中,x=0.8时,其抗压强度和塑性变形最佳,为1993 MPa和11.43%。To study the effect of Al content on the microstructure and mechanical properties of high entropy alloy CoCrCu_(0.5)FeTi_(0.5)Al_(x),CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0,0.2,0.4,0.6,0.8,1.0)is melted by vacuum arc furnace.X-ray diffractometer is used to measure the crystal structure of the alloy,scanning electron microscope is used to observe the microstructure of the alloy,and Vickers microhardness tester and universal testing machine are used to test the microhardness and compressive mechanical properties of the alloy.The results show that CoCrCu_(0.5)FeTi_(0.5)Al_(x) is composed of FCC phase and BCC phase.With the increase content of Al,the hardness increases gradually.When x=0,the minimum hardness is 323.61 Hv,and when x=1,the maximum hardness is 764.91 Hv.The plasticity of the alloy first decreases and then increases,and the compressive strength first increases and then decreases.When x=0,its plasticity is the best with plastic deformation of 32.08%,and when x=0.2,its plasticity is the worst with plastic deformation of 5.99%.When x=0.8,the compressive strength and plasticity are the best,which are 1993 MPa and 11.43%.

关 键 词：高熵合金 物相 微观组织 力学性能 

分 类 号：TG230.2[金属学及工艺—铸造]