Al0.3CoFeNi-x合金显微组织与性能研究

(西安工业大学 材料与化工学院,西安 710021

高熵合金; L12相; 压缩力学性能; 显微硬度

Microstructure and Properties of Al0.3CoFeNi-x High-Entropy Alloys
MA Jiaxin,YAO Yuhong,ZHOU Xueyang,GUO Mengyuan

(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China)

highentropy alloy; L12 phase; compression mechanical properties; microhardness

DOI: 10.16185/j.jxatu.edu.cn.2020.01.012 http://xb.xatu.edu.cn

备注

为了探讨C和Cu元素对Al0.3CoFeNi高熵合金微观组织及性能的影响,采用非自耗型真空电弧熔炼法制备了Al0.3CoFeNi,Al0.3CoFeNiC0.1,(Al0.3CoFeNi)99.9Cu0.1和(Al0.3CoFeNiC0.1)99.9Cu0.1 4种成分的高熵合金。运用X射线衍射仪测量合金的晶体结构,采用扫描电镜和透射电镜观察合金的表面形貌和微观组织,利用万能试验机和维氏显微硬度计分别测试合金的压缩力学性能和显微硬度。试验结果表明:Al0.3CoFeNi高熵合金为单一的FCC结构,分别添加1% C和0.1% Cu(原子百分比y/%)均未改变其晶体结构,但合金中析出了纳米相L12相,且0.1%Cu的添加会使L12相的尺寸减小。仅添加1%C时,L12相的颗粒尺寸约为30nm,再添加0.1% Cu后,L12相的颗粒尺寸减小到10nm。力学性能测试结果表明,(Al0.3CoFeNiC0.1)99.9Cu0.1合金的综合力学性能最好,其压缩屈服强度、抗压强度、压缩率和显微硬度分别可达为974 MPa、2532 MPa、51.9%和511.7HV。

In order to investigate the effect of C and Cu elements on the microstructure and properties of Al0.3CoFeNi high-entropy alloys,vacuum arc melting was used to prepare four kinds of high-entropy alloys:Al0.3CoFeNi,Al0.3CoFeNiC0.1,(Al0.3CoFeNi)99.9Cu0.1 and(Al0.3CoFeNiC0.1)99.9Cu0.1.Their crystal structures and microstructures were analyzed by an X-ray diffractometer,scanning electron microscope and transmission electron microscope,respectively.The test results are as follows.Al0.3CoFeNi high-entropy alloy had a single FCC structure and the additions of 1% C and 0.1% Cu respectively did not change its crystal structure,but nano-particle L12 phase precipitated in the alloy.And the addition of 0.1% Cu reduced the size of L12 phase.The particle size of the L12 phase was about 30 nm when 1% C alone was added,and the particle size of the L12 phase was reduced to 10 nm with another 0.1% Cu added.The mechanical property test results show that(Al0.3CoFeNiC0.1)99.9Cu0.1 alloy had the best comprehensive performance,and its compressive yield strength,compressive strength,compression ratio and micro hardness score could reach 974 MPa,2532 MPa,51.9% and 511.7 HV.