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Temperature Dependence of Fracture Toughness of the Cubic (L12) Titanium Trialuminides

Published online by Cambridge University Press:  15 February 2011

R. A. Varin  and
L. Zbroniec
R. A. Varin
Affiliation:
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
L. Zbroniec
Affiliation:
Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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Abstract

Fracture toughness vs. temperature of the cubic (L12), Mn- modified titanium trialuminide (based on Al3Ti) was investigated in air at the temperature range up to 1000°C. Toughness calculated from the maximum load exhibits a broad peak (KQ≈7–10 MPara0,5) at the 200- 500°C temperature range and then decreases with increasing temperature, reaching a room temperature value of ∼4.5 MPam0.5 at 1000°C. However, the work of fracture (γWOF, J/m2) and the stress intensity factor calculated from it (KIWOF) increases continuously with increasing temperature. Fracture modes exhibit a gradual transition from transgranular cleavage at room temperature to predominantly intergranular failure at the 800- 1000°C range.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 121
Copyright
Copyright © Materials Research Society 1997

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