Microstructure, mechanical property and Hall-Petch relationship of a light-weight refractory Al0.1CrNbVMo high entropy alloy fabricated by powder metallurgical process

• Published in: Journal of alloys and compounds Vol. 767; pp. 1012 - 1021
• Main Authors: Kang, Byungchul, Lee, Junho, Ryu, Ho Jin, Hong, Soon Hyung
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.10.2018
• Subjects: Hall-Petch relationship; High entropy alloy; Powder metallurgy; Specific yield strength; Specific yield strength; High entropy alloy; Powder metallurgy; Hall-Petch relationship
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.07.145

A light-weight refractory Al0.1CrNbVMo high entropy alloy (HEA) was fabricated by high energy ball milling and spark plasma sintering (SPS). The alloy had a density of 7.96 g/cm3, which is lower than that of conventional Ni-base superalloys. Optimum milling time was decided by the microstructure analysis of the HEA powders. The microstructure of the bulk alloy consisted of a body-centered cubic (BCC) matrix with a minor amount of alumina inclusions. The Al0.1CrNbVMo HEA exhibited outstanding compressive mechanical properties of 2863 MPa at room temperature, and 1405 MPa at 1000 °C, respectively. The specific yield strength of 176 MPa cm3/g at 1000 °C, is much higher than that of the other refractory HEAs. The Hall-Petch coefficient of the Al0.1CrNbVMo alloy was derived to 811 MPa μm0.5. •New refractory Al0.1CrNbVMo HEA was fabricated by the powder metallurgical process.•The alloy has lower density of 7.96 g/cm3 than conventional Ni-base superalloys.•The alloy shows the best specific yield strength at 25–1000 °C among the other HEAs.•Grain growth behavior and Hall-Petch relationship of Al0.1CrNbVMo HEA were analyzed.