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Plastic Deformation of Thin Metal Foils without Dislocations and Formation of Point Defects and Point Defect Clusters

Published online by Cambridge University Press:  18 March 2011

Michio Kiritani ,
Kazufumi Yasunaga ,
Yoshitaka Matsukawa  and
Masao Komatsu
Michio Kiritani
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation, Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5391, Japan
Kazufumi Yasunaga
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation, Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5391, Japan
Yoshitaka Matsukawa
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation, Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5391, Japan
Masao Komatsu
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation, Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5391, Japan
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Abstract

Evidence for plastic deformation of crystalline metal thin foils without dislocations is presented. Direct observation during deformation under an electron microscope confirmed the absence of the operation of dislocations even for heavy deformation. In fcc metals including aluminum, deformation leads to the formation of an anomalously high density of vacancy clusters, in the form of stacking fault tetrahedra. The dependency of vacancy cluster formation on temperature and deformation speed indicates that the clusters are formed by the aggregation of deformation-induced vacancies. Conditions required for the absence of the dislocation mechanism are explained, and a new atomistic model for plastic deformation of crystalline metals is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 673: Symposium P – Dislocations and Deformation Mechanisms in Thin Films and Small Structures , 2001 , P71.1
Copyright
Copyright © Materials Research Society 2001

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References

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