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Interfacial Properties and Mechanical Behavior of Titanium Aluminides

Published online by Cambridge University Press:  10 February 2011

M. H. Yoo  and
C. L. Fu
M. H. Yoo
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6115, yoo@ornl.gov
C. L. Fu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6115, yoo@ornl.gov
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Abstract

The role of various interfaces in deformation and fracture behavior of two-phase TiAl-Ti3Al alloys is analyzed on the basis of the specific interfacial and surface energies determined from ab initio calculations. The propensity of twinning observed in these alloys is consistent with the low true-twin boundary energy. The strong plastic anisotropy reported in TiAl polysynthetically twinned (PST) crystals is attributed partly to the localized slip along lamellar interfaces, thus lowering the yield stress for soft orientations. Interfacial fracture energies are estimated to be the highest for the α2/γ lamellar boundary and the lowest for the 120° rotational γ/γ boundary. The fracture mode mixity plays an important role in the crack-tip plasticity by ordinary slip and true-twinning, leading to translamellar and interfacial fracture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 492: Symposium S – Microscopic Simulation of Interfacial Phenomena in Solids… , 1997 , 345
Copyright
Copyright © Materials Research Society 1998

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