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Temperature and Strain Rate Dependence of Deformation-Induced Point Defect Cluster Formation in Metal Thin Foils

Published online by Cambridge University Press:  18 March 2011

K. Yasunaga ,
Y. Matsukawa ,
M. Komatsu  and
M. Kiritani
K. Yasunaga
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5193, Japan
Y. Matsukawa
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5193, Japan
M. Komatsu
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5193, Japan
M. Kiritani
Affiliation:
Academic Frontier Research Center for Ultra-high Speed Plastic Deformation Hiroshima Institute of Technology, Miyake 2-1-1, Saeki-ku, Hiroshima 731-5193, Japan
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Abstract

The mechanism of plastic deformation in thin metal foils without involving dislocations was examined by investigating the variations in vacancy cluster formation during deformation for a range of deformation speeds and temperatures. The deformation morphology was not seen to change appreciably over a very wide range of strain rate, 10-4/s – 106/s, whereas the number density of vacancy clusters was observed to increase with increasing strain rate up to saturation value that is dependent on materials and temperature. The density of vacancy clusters decreased to zero with decreasing deformation speed. The strain rate at which the density of vacancy clusters begins to decrease was found to be proportional to the vacancy mobility, suggesting that the vacancies are generated as dispersed vacancies and escape to the specimen surfaces during slow deformation without forming clusters. A very long tail in the distribution of the density of vacancy clusters towards lower strain rates was reasonably attributed to the generation of small vacancy complexes due to deformation. These results give valuable information that can be used to establish new models for plastic deformation of crystalline metals without involving dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 673: Symposium P – Dislocations and Deformation Mechanisms in Thin Films and Small Structures , 2001 , P3.5
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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