TY - JOUR
T1 - Collective behavior of strain-induced martensitic transformation (SIMT) in biomedical Co-Cr-Mo-N alloy polycrystal
T2 - An ex-situ electron backscattering diffraction study
AU - Lee, Byoung Soo
AU - Koizumi, Yuichiro
AU - Matsumoto, Hiroaki
AU - Chiba, Akihiko
N1 - Funding Information:
This research was supported by a Regional Innovation Cluster Program 2010, a Grant-in-Aid for Scientific Research Development, the Cooperation of Innovative Technology and Advanced Research in Evolving Area from Ministry of Education, Culture, Sports, Science and Technology of Japan . This research is supported also by a Grant-in-aid from the Japan Society for the Promotion of Science (JSPS) (Grant nos. 22360301, 23360299, 12J08210 ), and the inter-university cooperative research program of the Institute for Materials Research (IMR), Tohoku University, Sendai, Japan.
PY - 2014/8/12
Y1 - 2014/8/12
N2 - Collective behavior of strain induced martensitic transformation (SIMT) in biomedical Co-Cr-Mo-N alloy polycrystal has been investigated by ex-situ electron backscattering diffraction (EBSD) analysis during tensile deformation. The formation of SIMTed ε-hcp phase depends on the crystal orientation, and the SIMT behavior is basically understood by the motion of isolated Shockley partial dislocation associated with the negative stacking fault energy (SFE) of this alloy. However, their variant selection is not governed by Schmid's law. Most of SIMT occurred in grains with loading axes near and between 〈1. 1. 1〉 and 〈0. 1. 1〉 directions because of the low effective SFE, which is determined by the difference in the Schmid factors for leading and trailing Shockley partial dislocations. In grains with loading axes near the 〈0. 0. 1〉 direction, the SIMT did not occur due to the high value of the effective SFE. These findings are very important to improve the strength and wear resistance of this alloy without sacrificing the ductility by controlling the crystal texture.
AB - Collective behavior of strain induced martensitic transformation (SIMT) in biomedical Co-Cr-Mo-N alloy polycrystal has been investigated by ex-situ electron backscattering diffraction (EBSD) analysis during tensile deformation. The formation of SIMTed ε-hcp phase depends on the crystal orientation, and the SIMT behavior is basically understood by the motion of isolated Shockley partial dislocation associated with the negative stacking fault energy (SFE) of this alloy. However, their variant selection is not governed by Schmid's law. Most of SIMT occurred in grains with loading axes near and between 〈1. 1. 1〉 and 〈0. 1. 1〉 directions because of the low effective SFE, which is determined by the difference in the Schmid factors for leading and trailing Shockley partial dislocations. In grains with loading axes near the 〈0. 0. 1〉 direction, the SIMT did not occur due to the high value of the effective SFE. These findings are very important to improve the strength and wear resistance of this alloy without sacrificing the ductility by controlling the crystal texture.
KW - Biomedical Co-Cr-Mo-N alloys
KW - Crystal orientations
KW - EBSD
KW - Martensitic transformation
KW - Stacking fault energy
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U2 - 10.1016/j.msea.2014.05.071
DO - 10.1016/j.msea.2014.05.071
M3 - Article
AN - SCOPUS:84904682006
SN - 0921-5093
VL - 611
SP - 263
EP - 273
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -