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Collective behavior of strain-induced martensitic transformation (SIMT) in biomedical Co–Cr–Mo–N alloy polycrystal: An ex-situ electron backscattering diffraction study
- Source :
- Materials Science and Engineering: A. 611:263-273
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- 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 e-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.
- Subjects :
- Materials science
Condensed matter physics
Mechanical Engineering
Condensed Matter Physics
Crystallographic defect
Crystallography
Electron diffraction
Mechanics of Materials
Stacking-fault energy
Diffusionless transformation
Partial dislocations
General Materials Science
Texture (crystalline)
Deformation (engineering)
Electron backscatter diffraction
Subjects
Details
- ISSN :
- 09215093
- Volume :
- 611
- Database :
- OpenAIRE
- Journal :
- Materials Science and Engineering: A
- Accession number :
- edsair.doi...........96f7ab936e462483584bbd5f523bfa5f