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Microstructural and mechanical properties of ternary Mo-Si-B alloys resulting from different processing routes

Published online by Cambridge University Press:  04 February 2011

Manja Krüger ,
Martin Heilmaier ,
Veronika Shyrska  and
Petr I. Loboda
Manja Krüger
Affiliation:
Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, P.O. Box 4120, D‑39016 Magdeburg, Germany
Martin Heilmaier
Affiliation:
Technical University Darmstadt, Dept. Materials Science, D-64287 Darmstadt, Germany
Veronika Shyrska
Affiliation:
National Technical University of Ukraine “Kiyv Polytechnic Institute”, Kiew, Ukraine
Petr I. Loboda
Affiliation:
National Technical University of Ukraine “Kiyv Polytechnic Institute”, Kiew, Ukraine
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Abstract

Mo-base silicide alloys take advantage of their outstanding intrinsic properties, notably the high melting point and, thus, their excellent mechanical and creep strength. We demonstrate how the processing route influences the microstructure and consequently the mechanical and oxidation behaviour. Therefore two fabrication routes, a powder metallurgical (PM) and a zone melting (ZM) process, both starting from elemental powders, were used to prepare several Mo-Si-B alloys with varying chemical compositions. While PM processing leads to an ultrafine microstructure with a continuous Mo solid solution (“α-Mo”) matrix and embedded particles of the two intermetallic compounds Mo3Si and Mo5SiB2, the directionally solidified (ZM) materials possess a coarse grained structure composed of an intermetallic matrix with dendritic islands of α-Mo. A comparative assessment of the mechanical behaviour of the alloys utilizing both the Vickers indentation fracture (VIF) technique and three-point bending tests emphasizes the beneficial effect of a continuous Mo matrix resulting in increased room temperature fracture toughness and a reduction of the brittle-to-ductile-transition-temperature (BDTT). Likewise, the positive effect of the fine grained and homogeneous microstructure on oxidation performance is shown by the evaluation of mass change during heat treatment at 1100°C.

Keywords

Mozone meltingmechanical alloying
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n07-04
Copyright
Copyright © Materials Research Society 2011

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