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Relaxation Processes at High Temperature in TiAl-Nb-Mo Intermetallics

Published online by Cambridge University Press:  10 December 2012

Pablo Simas ,
Thomas Schmoelzer ,
Svea Mayer ,
Maria L. Nó ,
Helmut Clemens  and
Jose San Juan
Pablo Simas
Affiliation:
Física Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
Thomas Schmoelzer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria.
Svea Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria.
Maria L. Nó
Affiliation:
Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef-Str. 18, A-8700 Leoben, Austria.
Jose San Juan
Affiliation:
Física Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
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Abstract

In the last decades there was a growing interest in developing new light-weight intermetallic alloys, which are able to substitute the heavy superalloys at a certain temperature range. At present a new Ti-Al-Nb-Mo family, called TNM™ alloys, is being optimized to fulfill the challenging requirements. The aim of the present work was to study the microscopic mechanisms of defect mobility at high temperature in TNM alloys in order to contribute to the understanding of their influence on the mechanical properties and hence to promote the further optimization of these alloys. Mechanical spectroscopy has been used to study the internal friction and the dynamic modulus up to 1460 K of a TNM alloy under different thermal treatments. These measurements allow to follow the microstructural evolution during in-situ thermal treatments. A relaxation process has been observed at about 1050 K and was characterized as a function of temperature and frequency in order to obtain the activation parameters of the responsible mechanism. In particular, the activation enthalpy has been determined to be H= 3 eV. The results are discussed and an atomic mechanism is proposed to explain the observed relaxation process.

Keywords

internal frictionphase transformationalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 41 - 46
Copyright
Copyright © Materials Research Society 2012 

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