Materials Transactions Online

Materials Transactions, Vol.59 No.01 (2018) pp.136-145
© 2017 The Japan Institute of Metals and Materials

Quantitative Evaluation of Microstructure in Mo-Si-B-TiC Alloy Produced by Melting and Tilt Casting Methods

Sojiro Uemura1, Takateru Yamamuro2, Joung Wook Kim3, Yasuhiro Morizono4, Sadahiro Tsurekawa4 and Kyosuke Yoshimi3

1Department of Materials Sciences and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
2Faculty of Engineering, Kumamoto University, Kumamoto 860-8555, Japan
3Department of Metallurgy, Materials Science and Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
4Division of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Mo-Si-B-TiC alloys are expected to be a candidate for an ultrahigh-temperature material beyond Ni-base superalloys. This work quantitatively investigated the microstructure of a Mo-Si-B-TiC alloy with the composition of Mo-5Si-10B-10TiC (65Mo alloy) (at%) produced via arc-melting and tilt-casting techniques. The alloy was composed of four constituent phases: Mo solid solution (Moss), Mo5SiB2(T2), (Ti, Mo)Cx, (Mo, Ti)2C, and their eutectic (or peritecteutectic) phases. The compositions of the constituent phases were determined by electron beam micro analyzer (EPMA). Scanning electron microscopy - backscattered electron diffraction (SEM-EBSD) measurements revealed that T2 and (Ti, Mo)Cx phases have orientation relationships with Mo phase: $\{1 \bar 10 \}_{\rm Mo}//(001)_{\rm T2}$, ${<}111{>}_{\rm Mo}//{<}001{>}_{\rm T2}$ and $\{1 \bar 10 \}_{\rm Mo}// \{1 \bar 11 \}_{\rm (Ti,Mo)Cx}$, ${<}111{>}_{\rm Mo}//{<}001{>}_{\rm (Ti,Mo)Cx}$. Furthermore, the three-dimensional SEM observation with the combination of the focused ion beam (FIB) serial sectioning technique demonstrated that the T2 phase had a thin plate shape with the orientation of (001) as plate surfaces and of {100} as side ones.

This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 80 (2016) 529-538.

[doi:10.2320/matertrans.M2017194]

(Received 2017/06/30; Accepted 2017/10/27; Published 2017/12/25)

Keywords: molybdenum-silicon-boron alloys, titanium carbide, molybdenum, microstructure, three-dimensional analysis

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