TY - JOUR
T1 - Deformation mechanisms in tensile fracture of Al foils containing Si precipitates
AU - Satoh, Y.
AU - Yoshiie, T.
AU - Mori, H.
AU - Kiritani, M.
N1 - Funding Information:
We wish to thank professor M. Komatsu and Drs K. Matsukawa and K. Yasunaga of the Academic Frontier Research Center for Ultra-High-Speed Plastic Deformation, Hiroshima Institute of Technology, for their suggestions and technical support in the performance of experiments. This work was supported by the Ministry of Education, Culture, Sport, Science and Technology, Japan, as Academic Frontier Research for Ultra-high Speed Plastic Deformation.
PY - 2003/6/15
Y1 - 2003/6/15
N2 - Recently, Kiritani et al. proposed a new mechanism of plastic deformation without involving dislocations in tensile fracture of metal foils. The paper reports transmission electron microscopy (TEM) study of tensile fracture of Al containing hard precipitates (Si) that are considered to act as obstacles to dislocation motion. In sawtooth-shaped thin-foils formed at the fracture tip ('sawtooth portion'), tensile strain was as high as 103, but only a few dislocations were pinned to precipitates. Instead, voids were formed at precipitate/matrix interface, elongated in the direction of tension, and broke up into several smaller voids, due to stress concentration around hard precipitates. The thicker area of the specimen ('base portion'), where tensile strain was 30, did not contain voids but showed a dislocation cell structure. In tensile fracture of pre-thinned specimen, voids were formed in the sawtooth portion, despite the tensile strain also being 30. These results suggest that the sawtooth portion is formed by a new mechanism that does not involve dislocations.
AB - Recently, Kiritani et al. proposed a new mechanism of plastic deformation without involving dislocations in tensile fracture of metal foils. The paper reports transmission electron microscopy (TEM) study of tensile fracture of Al containing hard precipitates (Si) that are considered to act as obstacles to dislocation motion. In sawtooth-shaped thin-foils formed at the fracture tip ('sawtooth portion'), tensile strain was as high as 103, but only a few dislocations were pinned to precipitates. Instead, voids were formed at precipitate/matrix interface, elongated in the direction of tension, and broke up into several smaller voids, due to stress concentration around hard precipitates. The thicker area of the specimen ('base portion'), where tensile strain was 30, did not contain voids but showed a dislocation cell structure. In tensile fracture of pre-thinned specimen, voids were formed in the sawtooth portion, despite the tensile strain also being 30. These results suggest that the sawtooth portion is formed by a new mechanism that does not involve dislocations.
KW - Al alloy
KW - Crack
KW - Dislocation
KW - Fracture
KW - Precipitate
KW - Void
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U2 - 10.1016/S0921-5093(02)00707-4
DO - 10.1016/S0921-5093(02)00707-4
M3 - Article
AN - SCOPUS:0037534852
VL - 350
SP - 44
EP - 52
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -