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Additivity of Direct and Indirect Strengthening in TiB2-Reinforced Near-γ Titanium Aluminides

Published online by Cambridge University Press:  15 February 2011

S. L. Kampe ,
P. Sadler ,
L. Christodoulou  and
D. E. Larsen
S. L. Kampe
Affiliation:
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0237
P. Sadler
Affiliation:
Martin Marietta Laboratories, 1450 S. Rolling Road, Baltimore, MD 21227
L. Christodoulou
Affiliation:
Martin Marietta Laboratories, 1450 S. Rolling Road, Baltimore, MD 21227
D. E. Larsen
Affiliation:
Howmet Corporation, 1500 S. Warner St., Whitehall, MI 49461
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Abstract

An experimentally-based description of strengthening in a series of TiB2-reinforced near-y titanium aluminides is presented. The analysis provides a means to examine the strengthening contributions which are individually attributable to compositional variants, to indirect sources which are present due to the influence of the particulate on the underlying microstructure, and to those directly evolving from the presence of the reinforcement and its interaction with dislocations. Once the indirect strengthening contributions are isolated and arithmetically removed from the magnitude of the experimentally determined composite strength, the resulting direct strengthening increments are found to obey a linear relationship with the inverse-squareroot of the edge-to-edge interparticle spacing. The description of the dependence on spacing is found to be compatible with other studies where similar relationships have been reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 159
Copyright
Copyright © Materials Research Society 1994

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