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Influence of microstructure and processing on mechanical properties of advanced Nb-silicide alloys

Published online by Cambridge University Press:  18 December 2012

C. Seemüller ,
M. Heilmaier ,
T. Hartwig ,
M. Mulser ,
N. Adkins  and
M. Wickins
C. Seemüller*
Affiliation:
Physical Metallurgy, IAM-WK, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
M. Heilmaier
Affiliation:
Physical Metallurgy, IAM-WK, Karlsruhe Institute of Technology, Engelbert-Arnold-Str. 4, 76131 Karlsruhe, Germany
T. Hartwig
Affiliation:
Powder Technology, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Straße 12, 28359 Bremen, Germany
M. Mulser
Affiliation:
Powder Technology, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Straße 12, 28359 Bremen, Germany
N. Adkins
Affiliation:
IRC in Materials Processing, The University of Birmingham, Elms Road, Edgbaston, Birmingham B15 2TT, UK
M. Wickins
Affiliation:
IRC in Materials Processing, The University of Birmingham, Elms Road, Edgbaston, Birmingham B15 2TT, UK
*
*Corresponding author: Tel. +49 721 608 46556, [email protected]
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Abstract

In this study different powder metallurgical processing routes, commonly used for refractory metal based materials, were evaluated on their impact on mechanical properties of a multi-component Nb-20Si-23Ti-6Al-3Cr-4Hf (at.%) alloy. Powder was produced by gas-atomization or high energy mechanical alloying of elemental powders and then consolidated either by HIPing or powder injection molding (PIM). The PIM process requires fine particles. In this investigation powder batches of gas-atomized powder (< 25 μm) and mechanically alloyed powder (< 25 μm) were compacted via PIM. Fine (< 25 μm) and coarser (106-225 μm) particle fractions of gas-atomized powder were compacted via HIPing for comparison. Quantitative analysis of the resulting microstructures regarding porosity, phase formation, phase distribution, and grain size was carried out in order to correlate them with the ensuing mechanical properties such as compressive strength at various temperatures.

Keywords

Nbpowder metallurgycomposite
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 317 - 322
Copyright
Copyright © Materials Research Society 2012 

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References

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