Author/Authors :
Farshidi, M.H Metallurgical Engineering and Materials Science Department - Ferdowsi University of Mashhad, Mashhad, Iran , Doryo, H Mechanical Engineering Department - Doshisha University, Kyotanabe, Kyoto, Japan , Yuasa, M Mechanical Engineering Department - Doshisha University, Kyotanabe, Kyoto, Japan , Miyamoto, H Mechanical Engineering Department - Doshisha University, Kyotanabe, Kyoto, Japan
Abstract :
In this work, tendencies of pure Niobium, Fe-20Cr stainless steel, and Ti-36Nb-
2Ta-3Zr to formation of micro shear bands inside their microstructures during
severe plastic deformation are compared with their mechanical properties.
For this purpose, strain hardening behavior and strain rate sensitivity of flow
stress of these alloys were measured using tension tests and nano-indentation
tests, respectively. Microstructures of the alloys were studied using electron
backscattering diffraction method before and after imposition of severe plastic
deformation. Results show that increase of the strain hardening exponent
and/or strain rate sensitivity of flow stress causes decrease of tendency to
formation of micro shear bands during deformation. Moreover, formation
of micro shear bands can be approximately predicted using a parameter
previously proposed for prediction of formation of macro shear bands.
Keywords :
Micro shear band , Severe plastic deformation , Strain hardening , Strain rate sensitivity of flow , stress
