Microstructure, Mechanical Properties, and High-Temperature Oxidation Behaviors of the CrNbTiVAl x Refractory High-Entropy Alloys
Received date: 2024-06-18
Revised date: 2024-07-19
Online published: 2024-09-27
Supported by
National Natural Science Foundation of China(51971166);National Natural Science Foundation of China(51904218)
Owing to their high thermal stability, good high-temperature mechanical properties, and excellent high-temperature oxidation resistance, refractory high-entropy alloys (RHEAs) are strong candidates for structural materials in high-temperature applications. To reduce the density and improve the high-temperature oxidation resistance of RHEAs, in this study, the Al element was added into CrNbTiV alloys, forming a series of CrNbTiVAl x RHEAs (x = 0.25, 0.5, 0.75, 1.0). The effects of Al content on the microstructure, mechanical properties, and high-temperature oxidation behaviors of the CrNbTiV RHEAs were studied using XRD, SEM, EDS, and an electronic universal testing machine. A mixture of bcc, Laves, and α-Ti phases was found in the CrNbTiVAl x RHEAs and equiaxed grains were observed in the bcc phase. Increasing the Al content decreased the density of the alloys and reduced the yield strength from 2037 to 1371 MPa. The specific yield strength ranged from 215.93 MPa·cm3/g in CrNbTiVAl0.75 to 323.33 MPa·cm3/g in CrNbTiVAl0.25. After oxidation at 900 oC, the CrNbTiVAl x RHEAs exhibited parabolic oxidation kinetics and their high-temperature oxidation resistance was improved due to increased Al content. The oxidized products were determined as Al2O3, (CrNbTiVAl)O2, and VO x. The surfaces of the alloys with low Al content formed a continuous and compact complex oxide (CrNbTiVAl)O2 that effectively prevented the diffusion of O2 into the substrate. Increasing the Al content decreased the amount of complex oxide (CrNbTiVAl)O2, forming denser, continuous, and finer Al2O3 oxides on the surface that appreciably improved the high-temperature oxidation resistance.
ZHU Man , ZHANG Cheng , XU Junfeng , JIAN Zengyun , XI Zengzhe . Microstructure, Mechanical Properties, and High-Temperature Oxidation Behaviors of the CrNbTiVAl x Refractory High-Entropy Alloys[J]. Acta Metall Sin, 2025 , 61(1) : 88 -98 . DOI: 10.11900/0412.1961.2024.00201
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