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TiAlNb-alloy with a modulated B19 containing constituent produced by powder metallurgy

Published online by Cambridge University Press:  07 December 2012

Heike Gabrisch
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Uwe Lorenz
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Michael Oehring
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Jonathan Paul
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Florian Pyczak
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Marcus Rackel
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Frank-Peter Schimansky
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
Andreas Stark
Affiliation:
Helmholtz-Zentrum Geesthacht, Max-Planck Str.1, 21502 Geesthacht, Germany
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Abstract

Intermetallic TiAl alloys are of interest to the aero engine industry because of their light weight, corrosion resistance and excellent high temperature strength. This justifies the continued effort to improve properties and processing of these alloys.

A critical parameter that limits the practical implementation of Ti aluminides is their low ductility at room temperature. Recently, a new class of TiAl alloys based on a modulated lath structure has been introduced that exhibit an excellent combination of ductility and strength. A key component in this alloy is the orthorhombic phase B19 that is attributed to alloying with high amounts of niobium. The driving forces and mechanisms that lead to the observed modulated structures involving the B19 phase are not fully understood yet. As a first step to a better understanding we present a study of the thermal stability range of the phases involved.

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Articles
Copyright
Copyright © Materials Research Society 2012 

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