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Effect of Deformation Processing on Mechanical Properties of Nb-10 a/o Si In-Situ Composite

Published online by Cambridge University Press:  25 February 2011

I. Weiss ,
M. Thirukkonda  and
R. Srinivasan
I. Weiss
Affiliation:
Mechanical and Materials Engineering Dept., Wright State University, Dayton, Ohio 45435-0002
M. Thirukkonda
Affiliation:
Mechanical and Materials Engineering Dept., Wright State University, Dayton, Ohio 45435-0002
R. Srinivasan
Affiliation:
Mechanical and Materials Engineering Dept., Wright State University, Dayton, Ohio 45435-0002
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Abstract

Nb-10 a/o Si alloy is an in-situ composite. The microstructure of the cast alloy consists of pro-eutectic Nb dendrites distributed in a matrix of eutectic Nb3Si + Nb phases. The microstructure of the as-cast alloy was modified by multiple hot extrusions producing an oriented composite. Extensive grain size refinement occurred in both the Nb and Nb3Si phases. The ductile primary (pro-eutectic) Nb particles were aligned along the extrusion direction. Bend strength and fracture toughness measured by three point bend and four point bend tests, respectively, showed that both the yield strength and fracture toughness of the alloy increases considerably following this thermomechanical processing. These improvements have been attributed to the changes in size, morphology and spacing of the constituent phases and their microstructural refinement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 377
Copyright
Copyright © Materials Research Society 1994

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