High-Temperature Age-Hardening of a Novel Cost-Effective Fe 45Ni 25Cr 25Mo 5 High Entropy Alloy
14 Pages Posted: 4 Sep 2019
Considering the high potential of age-hardening in metastable non-equiatomic high entropy alloys (HEAs), the high-temperature ageing behaviour of a newly developed cost-effective Fe45Ni25Cr25Mo5 HEA with a face-cantered cubic (FCC) matrix was investigated. The alloy demonstrates a significant high-temperature age-hardening response and a good balance of strength and ductility was achieved with compression yield strength of 543.7 MPa, ultimate strength of 1098.1 MPa and elongation of 40% at the peak aged (900°C for 48 hours) condition. Such high-temperature age response of the Fe45Ni25Cr25Mo5 alloy was attributed to the precipitation strengthening by the monoclinic Cr5.5Mo1.5Fe6.5Ni1.5-type precipitates formed during the ageing.
Keywords: High entropy alloys, High-temperature aging, Precipitation hardening, Intermetallics
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