TY - JOUR
T1 - Nitrogen-induced dynamic strain aging in a biomedical-grade Co-Cr-Mo alloy
AU - Yamanaka, Kenta
AU - Mori, Manami
AU - Chiba, Akihiko
N1 - Funding Information:
This research was supported by the Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University” and the Regional Innovation Cluster Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
PY - 2012/8/30
Y1 - 2012/8/30
N2 - The present study examined plastic deformation behavior of a biomedical-grade Co-29Cr-6Mo (wt.%) alloy at intermediate temperatures, focusing on dynamic strain aging (DSA) induced by nitrogen doping (0.2wt.%). The compression tests were performed at strain rates in the range of 10 -4 to 10 -1s -1 at temperatures between room temperature and 1073K. Gliding of Shockley partial dislocations bounding stacking faults played a dominant role in the plastic deformation over a wide temperature range. The nitrogen-associated DSA resulted in enhanced in-grain lattice distortions even when there was little macroscopic serrated flow. Shear band formation was identified after the lamellar structures developed, in spite of quite small macroscopic strain (5% in height reduction). Cr-N short-range ordering can be responsible for the observed DSA.
AB - The present study examined plastic deformation behavior of a biomedical-grade Co-29Cr-6Mo (wt.%) alloy at intermediate temperatures, focusing on dynamic strain aging (DSA) induced by nitrogen doping (0.2wt.%). The compression tests were performed at strain rates in the range of 10 -4 to 10 -1s -1 at temperatures between room temperature and 1073K. Gliding of Shockley partial dislocations bounding stacking faults played a dominant role in the plastic deformation over a wide temperature range. The nitrogen-associated DSA resulted in enhanced in-grain lattice distortions even when there was little macroscopic serrated flow. Shear band formation was identified after the lamellar structures developed, in spite of quite small macroscopic strain (5% in height reduction). Cr-N short-range ordering can be responsible for the observed DSA.
KW - Biomedical-grade Co-Cr-Mo alloys
KW - Dislocation structure
KW - Dynamic strain aging
KW - Nitrogen addition
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U2 - 10.1016/j.msea.2012.05.003
DO - 10.1016/j.msea.2012.05.003
M3 - Article
AN - SCOPUS:84862986971
VL - 552
SP - 69
EP - 75
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
ER -