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Advanced intermetallic γ-TiAl based alloys with improved microstructural stability during creep

Published online by Cambridge University Press:  02 January 2015

M. Kastenhuber ,
B. Rashkova ,
H. Clemens  and
S. Mayer
M. Kastenhuber
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
B. Rashkova
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
H. Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
S. Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
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Abstract

Ensuring microstructural stability under technical relevant conditions is a determining criterion for the development of innovative high-temperature materials. In this work, the influ-ence of C and Si on the microstructural stability during creep exposure was investigated for a β-solidifying γ-TiAl based alloy with a nominal composition of Ti-43.5Al-4Nb-1Mo-0.1B (in at.%), named TNM. With a two-step heat treatment a microstructure consisting of fine lamellar α2/γ-colonies, surrounded by βo-phase and areas of discontinuous precipitation, starting from the boundaries of the lamellar colonies, was adjusted. Creep tests were carried out to examine the potential of C and Si to prevent microstructural instability during creep and hence improving the creep properties. At 815 °C the discontinuous precipitation process of the TNM alloy continues during ensuing creep testing leading to a reduced creep resistance. In comparison, the minimum creep rate of the TNM-0.3C-0.3Si alloy was significantly decreased caused by the lower βo-phase content and average lamellar spacing within the α2/γ-colonies, the precipitation of p-Ti3AlC carbides and the retarded kinetics of discontinuous precipitation.

Keywords

microstructurephase equilibriaalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy07-03
Copyright
Copyright © Materials Research Society 2014 

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