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High-Temperature Compression Strength of Directionally Solidified Nb-Mo-W-Ti-Si In-Situ Composites

Published online by Cambridge University Press:  21 March 2011

Hisatoshi Hirai ,
Tatsuo Tabaru ,
Jiangbo Sha ,
Hidetoshi Ueno ,
Akira Kitahara  and
Shuji Hanada
Hisatoshi Hirai
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Tatsuo Tabaru
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Jiangbo Sha
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Hidetoshi Ueno
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Akira Kitahara
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980–8577, Japan
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Abstract

Directionally solidified Nb-xMo-22Ti-18Si (x = 10, 20 and 30 mol%) and Nb-10Mo-yW-10Ti-18Si (y = 0, 5, 10 and 15 mol%) alloys were prepared. All of the alloys consisted of Nb solid solution and (Nb, Mo, (W,) Ti)5Si3 silicide. In compression tests performed on the Nb-xMo-22Ti-18Si alloys, a sample with x = 10 had the highest maximum stress at 1670 K, but it showed a sharp stress drop after reaching the maximum stress. Samples with x = 20 and 30 showed lower yield and lower maximum stress than that with x = 10, and they showed a small stress drop and an almost constant flow stress of 330 and 400 MPa, respectively. The sample with x = 20 showed a minimum creep rate (εm) of 9.6 × 10-7 s-1 at 1670 K at a stress of 200 MPa. The yield stress of the Nb-10Mo-yW-10Ti-18Si alloys increased with increasing W content, although the stress decreased gradually after reaching the maximum stress and showed no steady state deformation. The εm of the sample with y = 15 was 1.4 × 10-7 s-1 at 1670 K at a stress of 200 MPa, which was much slower than that of Nb-20Mo-22Ti-18Si.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.41.1
Copyright
Copyright © Materials Research Society 2001

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References

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