CrMoNbV高熵合金微观组织与力学性能

Microstructure and Mechanical Properties of CrMoNbV High-entropy Alloy

利用真空电弧炉熔炼制备了CrMoNbV高熵合金。通过XRD、SEM、EDS分析和显微硬度以及压缩试验,研究了合金的相结构、微观组织和力学性能。结果表明:CrMoNbV合金为单一的BCC固溶体结构,合金铸态组织为典型的树枝晶。Mo主要分布于枝晶内,Cr则分布于枝晶间,Nb,V分布较均匀。CrMoNbV高熵合金的硬度可达681.5HV,抗压强度为1450MPa,几乎无塑性变形发生,压缩断口形貌表现为解理脆断。

A new high entropy alloy（HEA） CrMoNbV was produced by vacuum arc melting. The phase structure, microstructure and mechanical properties of CrMoNbV HEA were characterized respectively by XRD, SEM, EDS, microhardness testing and compression test. The results reveal that the alloy phase structure is a single-phase body-centered cubic（BCC） solid solution.The microstructure of as-cast alloy is typical dendrite. Mo is mainly distributed in dendrite, and Cr is distributed in interdendrite.The distribution of Nb and V is uniform. The vickers microhardness of the alloy is 681.5 HV and a high compressive strength is1450 MPa. nearly without plastic deformation appears, the compressive fracture of the alloy shows brittle cleavage fracture.