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Relationship Between the Ductility and Impurity Hydrogen in Ni3Al

Published online by Cambridge University Press:  22 February 2011

R. Chikaizumi ,
G. Itoh ,
M. Kanno  and
H. Okada
R. Chikaizumi
Affiliation:
Department of Materials Science, Division of Engineering, Graduate School, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113, Japan
G. Itoh
Affiliation:
Department of Materials Science, Faculty of Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113, Japan
M. Kanno
Affiliation:
Department of Materials Science, Faculty of Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113, Japan
H. Okada
Affiliation:
Department of Materials Science, Division of Engineering, Graduate School, The University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo 113, Japan
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Abstract

Tensile tests were carried out on B-doped and undoped Ni3Al having different hydrogen contents in order to examine whether the amount of impurity hydrogen affects the ductility of Ni3Al. Specimens were melted either in a high vacuum of ∼10−3Pa or argon, isothermally forged and finally annealed for 15hr at 430°C in an ultra high vacuum of ∼10−3Pa or in argon, respectively. Measurement of hydrogen gas evolved from the specimen during the annealing at 430°C in an ultra high vacuum of ∼10−7Pa confirmed that vacuum treated specimen had actually smaller hydrogen content than the argon treated one. The ductility of vacuum treated specimens both B-doped and undoped was found to be larger than that of argon treated ones, which means a detrimental influence of hydrogen. Hydrogen evolution behavior during the test on B-dopcd specimens in an ultra high vacuum of ∼10−8Pa revealed that the amount of hydrogen gas evolved at the moment of fracture was smaller in vacuum treated specimens than in argon treated one. Impurity hydrogen atoms were considered to move and enhance the formation and growth of voids, accelerating transgranular fracture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1153
Copyright
Copyright © Materials Research Society 1995

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