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Deformation behavior of Zr- and Ni-based bulk glassy alloys

Published online by Cambridge University Press:  03 March 2011

Dmitri V. Louzguine-Luzgin*
Affiliation:
Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577, Japan
Yuqiao Zeng
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Albertus Deny Heri Setyawan
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Nobuyuki Nishiyama
Affiliation:
R&D Institute of Metals and Composites for Future Industries (RIMCOF), Aoba-ku, Sendai 980-8577, Japan
Hidemi Kato
Affiliation:
Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577, Japan
Junji Saida
Affiliation:
Center for Interdisciplinary Research, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Aoba-Ku, Sendai 980-8577, Japan
*
a) Address all correspondence to this author. e-mail: dml@imr.tohoku.ac.jp
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Abstract

This article presents a comparative study of the deformation-induced structural changes observed within a glassy phase in two different Zr- and Ni-based alloys. Ductile Zr65Al7.5Ni10Pd17.5 bulk glassy alloy, which exhibits dynamic nanocrystallization forming a crystalline cubic phase within shear bands on plastic deformation, is presumed to contain pre-existing nuclei. On the contrary, no obvious dynamic nanocrystallization is observed within the shear bands in the glassy phase of the Ni50Pd30P20 bulk alloy, which, however, contains clear medium-range order zones on the order of 1 nm in size in an as-solidified state. This alloy exhibits nucleation and growth-transformation behavior on heating. At the same time, clear nucleation and growth of the cubic Ni-based phase are observed near the microcrack area in the deformed sample. High energy released at the time of the microcrack propagation caused nanocrystallization and blockage of the crack-tip propagation.

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Articles
Copyright
Copyright © Materials Research Society 2007

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References

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