TY - JOUR
T1 - 3-D structures of crack-tip dislocations and their shielding effect revealed by electron tomography
AU - Tanaka, Masaki
AU - Honda, Masaki
AU - Sadamatsu, Sunao
AU - Higashida, Kenji
N1 - Funding Information:
The authors appreciate that the work is partly supported by a Grant-in-Aid for Scientific Research (b) by The Ministry of Education, Culture, Sports, Science and Technology (KAKENHI#18360305).
PY - 2010/8
Y1 - 2010/8
N2 - Three-dimensional structures of crack-tip dislocations in silicon crystals have been examined by combining scanning transmission electron microscopy and computed tomography. Cracks were introduced by a Vickers hardness tester at room temperature, and the sample was heated at 823 K for 1 h in order to introduce dislocations around the crack tips. Dislocation segments cut out from loops were observed around the crack tip, the three-dimensional structure of which was characterized by using by electron tomography. Their Burgers vectors including the sings were also determined by oscillating contrasts along dislocations. In order to investigate the effect of the dislocations on fracture behaviours, local stress intensity factor due to one dislocation was calculated, which indicates the dislocations observed were shielding type to increase fracture toughness.
AB - Three-dimensional structures of crack-tip dislocations in silicon crystals have been examined by combining scanning transmission electron microscopy and computed tomography. Cracks were introduced by a Vickers hardness tester at room temperature, and the sample was heated at 823 K for 1 h in order to introduce dislocations around the crack tips. Dislocation segments cut out from loops were observed around the crack tip, the three-dimensional structure of which was characterized by using by electron tomography. Their Burgers vectors including the sings were also determined by oscillating contrasts along dislocations. In order to investigate the effect of the dislocations on fracture behaviours, local stress intensity factor due to one dislocation was calculated, which indicates the dislocations observed were shielding type to increase fracture toughness.
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U2 - 10.1093/jmicro/dfq031
DO - 10.1093/jmicro/dfq031
M3 - Article
C2 - 20551448
AN - SCOPUS:77955544324
VL - 59
SP - S55-S60
JO - Microscopy (Oxford, England)
JF - Microscopy (Oxford, England)
SN - 2050-5698
IS - SUPPL. 1
ER -