中文摘要：

为了研究C元素对A1FeCoNiCx（x=0，0．1，O．2）高熵合金微观组织及性能的影响，采用真空电弧熔炼法制备了不同C含量的A1FeCoNiCx（x=0，0．1，0．2）高熵合金．运用光学显微镜、X射线衍射、扫描电镜及电子万能试验机研究了C含量对AlFeCoNiCx（x=0，0．1，0．2）高熵合金微观组织、压缩性能以及断裂机理的影响．研究结果表明：A1FeCoNi为等轴晶组织，压缩性能较差，屈服强度、抗压强度和压缩率分别只有1187MPa、1291MPa和8．3％．当x=0．1时，铸态组织由等轴晶向树枝晶转变，而且有FCC相生成，屈服强度、抗压强度和压缩率分别达到1130MPa、2875MPa和22．5％．对比可以看出，当x=0．1时，材料压缩性能有很大的提高；当x=0．2时，屈服强度达到1250MPa，抗压强度达到2825MPa．随着C元素的加入，合金断裂形式由解理断裂转变为准解理断裂．

英文摘要：

The effect of carbon on the microstructure and properties of A1FeCoNi high entropy alloys （HEAs） is studied. The samples of A1FeCoNiCx with different carbon content is prepared by the vacuum arc melting. The effect of carbon content on the microstructure, compression properties and fracture mechanism for AlFeCoNiCx HEAs is investigated using optical microscopy, X-ray diffraction, scanning electron microscopy and compressive tests. The result shows that A1FeCoNi HEAs has the dendrite structure, compression properties is poorer, and yield strength, compressive strength and compression ratios are 1 187 MPa, 1 291 MPa and 8.3%, respectively. Cast structure is transitioned from equiaxed grains to dendrites when x= 0. 1, yield strength, compressive strength and compression ratio are 1 130 MPa, 2 875 MPa and 22.5 %, respectively. The material compression properties is greatly improved when x=0. 1;Yield strength = 1 250 MPa,the maximum compressive strength = 2 825 MPa,when x=0. 21 With the increase of carbon element,the fracture mode of alloy is transitioned from cleavage fracture to quasi-cleavage.