日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
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アーク溶解・傾角鋳造法で作製した Mo-Si-B-TiC 合金の微細組織の定量評価
上村 宗二朗山室 賢輝金 正旭森園 靖浩連川 貞弘吉見 享祐
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2016 年 80 巻 8 号 p. 529-538

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 Mo-Si-B-TiC alloys have been produced as candidates for a ultrahigh-temperature materials to replace Ni-base superalloys. We have quantitatively investigated the microstructure of a Mo-Si-B-TiC alloy composition. Mo-5Si-10B-10TiC (65Mo alloy) (at%) produced via arc-melting and tilt casting techniques. The starting material was composed of four constituent phases: Mo solid solution (Moss), Mo5SiB2, (Ti, Mo)Cx, (Mo, Ti)2C, and their eutectic (or peritecteutectic) phases. The compositions of these constituent phases were determined by EPMA. SEM-EBSD measurements revealed that T2 and (Ti, Mo)Cx phases have orientation relationships with Mo phase: {110}Mo//(001)T2, 〈111〉Mo//〈100〉T2 and {110}Mo//{111}(Ti, Mo)Cx, 〈111〉Mo//〈110〉(Ti, Mo)Cx. Furthermore, 3-dimensional SEM examination combined with the FIB serial sectioning technique demonstrated that the T2 phase had a thin plate shape of orientation (001) for the plate surfaces and {100} for side ones.

Fig. 10 Fullsize Image
Three-dimensional phase images reconstructed from serially-sectioned images: (a) (Ti, Mo)Cx and T2(Mo5SiB2), (b) (Ti, Mo)Cx, (c)T2.
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