Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.730-733
© 2018 The Japan Institute of Metals and Materials

Age Heat Treatment of the CoCrFeNiTi0.3 High-Entropy Alloy

Tao-Tsung Shun, Cheng-Ying Hsieh, Wei-Jhe Hung and Che-Fu Lee

Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan

The hardness and microstructure of an as-cast CoCrFeNiTi0.3 high-entropy alloy after age heat treatment 24-144 h at 500-1000°C are investigated. The as-cast alloy has a dendritic structure in which the dendrite is a Ti-lean face-centered cubic solid solution phase (FCC1) and the interdendrite consists of a Ti-rich face-centered cubic solid solution phase (FCC2), a mixture of (Cr, Fe)-rich σ phase and (Ni, Ti)-rich η phase. After a 144 h of age heat treatment, age hardening is observed at temperatures of 600-800°C because the amount of σ phase increases in the interdendrite. The optimum hardness is obtained at an aging temperature of 700°C, which makes the hardness increase from HV366 to HV508. However, age softening occurs at 900-1000°C. The vanishing σ phase at 1000°C brings the alloy hardness to the minimum, HV223.

[doi:10.2320/matertrans.M2017418]

(Received 2017/12/28; Accepted 2018/02/16; Published 2018/04/25)

Keywords: high-entropy alloy, hardness, microstructure, age hardening, age softening

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