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Effect of Ti addition on density and microstructure development of MoSiBTiC alloy

Published online by Cambridge University Press:  12 January 2015

Joung Wook Kim ,
Kyosuke Yoshimi ,
Hirokazu Katsui  and
Takashi Goto
Joung Wook Kim
Affiliation:
Department of Materials Science and Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
Kyosuke Yoshimi
Affiliation:
Department of Materials Science and Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
Hirokazu Katsui
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
Takashi Goto
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
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Abstract

The effect of Ti addition on the density and microstructure development of MoSiBTiC alloy was investigated. Two kinds of MoSiBTiC alloys with the composition of Mo-5Si-10B-10Ti-10C (10Ti alloy) and Mo-5Si-10B-15Ti-10C (15Ti alloy) (at. %) were prepared by conventional arc-melting. The primary phase of as-cast 10Ti and 15Ti alloys was (Ti,Mo)C, and there were two eutectic phases of Moss + (Ti,Mo)C and Moss + T2 + (Ti,Mo)C in the alloys. In addition, 10Ti alloy had a Moss + T2 + (Mo,Ti)2C eutectic. There was no Moss + T2 + (Mo,Ti)2C eutectic in the 15Ti alloy, and thus it is apparent that the (Mo,Ti)2C formation was suppressed by 5 at. % Ti addition. The volume fraction of (Ti,Mo)C increased and thus the density reduced from 8.78 to 8.43 g/cm3 with the Ti addition. In all constituent phases, Ti concentration increased while Mo concentration decreased. In spite of the changes, hardness, Young’s modulus and shear modulus were hardly changed. Therefore, Ti addition seems to be effective to further lower the density without deteriorating mechanical properties of the MoSiBTiC alloy.

Keywords

microstructurehardnessMo
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy05-06
Copyright
Copyright © Materials Research Society 2015 

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References

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