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Measurement of the Tension/Compression Asymmetry Exhibited by Single Crystalline γ-Ti 55.5at%Al

Published online by Cambridge University Press:  21 March 2011

Marc Zupan  and
K.J. Hemker
Marc Zupan
Affiliation:
Johns Hopkins Univ., Dept. of Mechanical Engineering, Baltimore, MD 21218, U.S.A
K.J. Hemker
Affiliation:
Johns Hopkins Univ., Dept. of Mechanical Engineering, Baltimore, MD 21218, U.S.A
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Abstract

Microsample test specimens of single crystalline γ-Ti 55.5at%Al oriented near the [001], and [-110] crystal axes have been deformed in tension and compression at 973K. From these experiments, measurements of the 0.2% offset flow stress have been made as a function of temperature, crystal orientation and sense of the applied load. A measurable violation of Schmid's law was observed and a significant tension/compression asymmetry has been observed at this temperature for the above listed orientations. Single-cycle loading experiments designed to measure the tension/compression asymmetry of the yield strength on the same sample have been conducted along the ∼[-110] and [001] orientations. The flow strength measurements from the specimens, which underwent the fully reversed cyclic-loading experiment, fall near those of the monotonically loaded microsamples deformed at the same temperature, which suggests that the same deformation mode was active in both tension and compression.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N7.9.1
Copyright
Copyright © Materials Research Society 2001

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