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Development of Tough and Strong Cubic Titanium Trialuminides

Published online by Cambridge University Press:  21 March 2011

Robert A. Varin ,
Les Zbroniec  and
Zhi Gang Wang
Robert A. Varin
Affiliation:
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Les Zbroniec
Affiliation:
National Institute of Materials and Chemical Research, 1–1 Higashi, Tsukuba, Ibaraki 305–8565, Japan
Zhi Gang Wang
Affiliation:
Institute of Aeronautical Materials, Bejing 100095, P.R. China
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Abstract

In this work, the recent breakthroughs in the understanding of the fracture behavior and fracture toughness of L12-ordered titanium trialuminides are described and discussed. First, it is shown that, as opposed to many other intermetallics and specifically those with an L12 crystal structure, the fracture toughness of L12 titanium trialuminides is insensitive to testing in various environments such as air, water, argon, oxygen and vacuum (∼1.3×10–5 Pa). Second, it is reported here that by increasing the concentration of Ti combined with boron (B) doping, the room temperature fracture toughness of a Mn-stabilized titanium trialuminide can be improved by 100% from ∼4 MPam1/2 to ∼8 MPam1/2 and by 150–250% at 1000°C to ∼(10–12) MPam1/2 with a simultaneous suppression of intergranular fracture (IGF) to ∼(40–50%). Almost three fold increase in yield strength to ∼550 MPa is attained at room temperature for high Ti, boron-doped trialuminides. Both Vickers microhardness and strength increase linearly with increasing concentration of (Ti+B) indicating a classical solid solution strengthening response.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N3.11.1
Copyright
Copyright © Materials Research Society 2001

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References

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