TY - JOUR
T1 - Defect structures introduced in FCC metals by high-speed deformation
AU - Kiritani, Michio
AU - Sota, Takashi
AU - Tawara, Tamae
AU - Arimura, Hiroshi
AU - Yasunaga, Kazufumi
AU - Matsukawa, Yoshitaka
AU - Komatsu, Masao
N1 - Funding Information:
This work was supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan as an Academic Frontier Research Project on High Speed Plastic Deformation.
PY - 2002
Y1 - 2002
N2 - Variation in defect microstructures introduced by compression of three fcc metals, Al, Cu and Ni, was investigated over a wide range of strain rate, from 10-2 to 106/s. Dislocations formed under high-speed deformation are randomly distributed, whereas dislocations formed under low-speed deformation develop into cell structures, the transition between the two being at a strain rate of 103. Dislocations of opposite signs are equally mixed in high-speed deformation, whereas grouped dislocations in low-speed deformation are composed of unbalanced numbers of dislocations of opposite signs. In high-speed deformation vacancy clusters are formed at high density all over the matrix, whereas in low-speed deformation only a few numbers of vacancy clusters are formed in the area of localized distribution of dislocations, the boundary between these two characteristics being at the transition of the nature of dislocation distribution. In the high-speed deformation vacancy clusters are formed by the aggregation of deformation-induced vacancies, whereas in low-speed deformation they are produced directly by dislocation reaction during deformation. Stress during high-speed compression has been estimated to increase to more than 10 GPa. A model of plastic deformation that produces vacancies at high concentration is proposed, in which high-speed plastic deformation proceeds without involving dislocations.
AB - Variation in defect microstructures introduced by compression of three fcc metals, Al, Cu and Ni, was investigated over a wide range of strain rate, from 10-2 to 106/s. Dislocations formed under high-speed deformation are randomly distributed, whereas dislocations formed under low-speed deformation develop into cell structures, the transition between the two being at a strain rate of 103. Dislocations of opposite signs are equally mixed in high-speed deformation, whereas grouped dislocations in low-speed deformation are composed of unbalanced numbers of dislocations of opposite signs. In high-speed deformation vacancy clusters are formed at high density all over the matrix, whereas in low-speed deformation only a few numbers of vacancy clusters are formed in the area of localized distribution of dislocations, the boundary between these two characteristics being at the transition of the nature of dislocation distribution. In the high-speed deformation vacancy clusters are formed by the aggregation of deformation-induced vacancies, whereas in low-speed deformation they are produced directly by dislocation reaction during deformation. Stress during high-speed compression has been estimated to increase to more than 10 GPa. A model of plastic deformation that produces vacancies at high concentration is proposed, in which high-speed plastic deformation proceeds without involving dislocations.
KW - Dislocations
KW - Electronmicroscopy
KW - FCC metals
KW - High speed deformation
KW - Point defect clusters
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U2 - 10.1080/10420150211397
DO - 10.1080/10420150211397
M3 - Article
AN - SCOPUS:0038741754
VL - 157
SP - 53
EP - 74
JO - Radiation Effects and Defects in Solids
JF - Radiation Effects and Defects in Solids
SN - 1042-0150
IS - 1-2
ER -