Materials Transactions Online

Materials Transactions, Vol.59 No.04 (2018) pp.556-562
© 2018 The Japan Institute of Metals and Materials

Microstructural Investigation of Oxidized Complex Refractory High Entropy Alloys

Kai-Chi Lo1, 2, An-Chou Yeh1 and Hideyuki Murakami2, 3

1Frontier Materials & Engineering Alloys Laboratory, Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan, R. O. C.
2Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-0047, Japan
3Department of Nanoscience and Nanoengineering, Waseda University, Tokyo 169-8555, Japan

The microstructures of two newly developed refractory high entropy alloys were examined after isothermal oxidation at 1200°C for 10 hours. Scanning electron microscope analysis showed the formation of aluminosilicate layer on the sample surface, and the structure of oxide layers appears to be greatly affected by the content of Al and V. With increased Al content and decreased V content, the size of pores within the internal oxidation zone was decreased. Future directions to improve the oxidation resistance of complex refractory alloys were proposed.

[doi:10.2320/matertrans.MJ201611]

(Received 2017/08/14; Accepted 2018/01/31; Published 2018/03/25)

Keywords: high entropy alloys, refractory alloys, oxidation

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