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Anomalous strain rate dependence of tensile ductility in moisture-embrittled Co3Ti alloys

Published online by Cambridge University Press:  31 January 2011

T. Takasugi
Affiliation:
Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
T. Tsuyumu
Affiliation:
Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
Y. Kaneno
Affiliation:
Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
H. Inoue
Affiliation:
Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University, Sakai, Osaka 599–8531, Japan
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Abstract

The effect of strain rate on tensile ductility of moisture-induced embrittlement of Co3Ti alloys was investigated at ambient temperatures (298–353 K) by tensile test and scanning electron microscope fractography. The anomalous increase of tensile elongation and ultimate tensile stress was observed in a very low strain rate region and also at high temperatures, accompanied by an increase of area fraction in ductile transgranular fracture pattern. The anomalous strain rate dependence of tensile ductility was shown to become more evident with decreasing grain size and also with deviation from alloy stoichiometry. Oxidation on the alloy surface was suggested as a process counteractive to the hydrogen decomposition process from moisture in air.

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Articles
Copyright
Copyright © Materials Research Society 2000

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References

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