Fatigue Crack Growth Mechanisms Of Cast Ti-48Al (at.%) Alloy
Author(s)
S. Hamada, A. Nozue & M.N. Tamin
Abstract
Fatigue crack growth mechanisms of cast
Ti-48AI (at. %) alloy
S. Hamada\ A. Nozue* & M. N. TamirT
^Faculty of Science and Technology,
Sophia University, Tokyo, JAPAN.
^Department of Applied Mechanics,
Universiti Teknologi Malaysia, MALAYSIA.
Abstract
Substantial cost reduction for cast TiAl automotive parts could be achieved by
eliminating hot isostatic pressing (HIPing) procedure during the material
processing. In this respect, a cast Ti-48Al (at %) intermetallic alloy is evaluated
in the non-HIPed condition with the objective to establish the fatigue crack
growth response and identify the fracture mechanisms. For this purpose, a series
of fatigue crack growth tests were performed on the alloy with three different
microstructures, with a load ratio, R=0.1, in both air and vacuum environment.
Environment effect is manifested in the threshold AK levels of 9.6 and 13
MPaVm for crack growth response in air and vacuum, respectively. In the
intermediate range of crack growth rate
Keywords
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