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Numerical Simulations of Tensile Deformation Behavior in Two Phase α2 + γ Lamellar Tial Alloys

Published online by Cambridge University Press:  22 February 2011

Bimal K. Kad ,
Ming Dao  and
Robert J. Asaro
Bimal K. Kad
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California-San Diego, La Jolla, CA 92093-0411
Ming Dao
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California-San Diego, La Jolla, CA 92093-0411
Robert J. Asaro
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California-San Diego, La Jolla, CA 92093-0411
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Abstract

Deformation microstructures in γ-TiAl + α2Ti3Al based fully lamellar (FL) and nearly lamellar (NL) microstructures have been simulated using micro-mechanical methods. The deformation is extremely inhomogenous resulting in a large accumulation of hydrostatic stresses at the grain boundaries, thereby promoting intergranular fracture initiation. In particular, the increase in ductility with increasing equiaxed γ-grain volume fraction (with compliant deformation characteristics) in nearly lamellar alloys is explained by the reduction of the hydrostatic stress buildup at the boundaries, consequently mitigating fracture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 169
Copyright
Copyright © Materials Research Society 1995

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