Shear bands in deformed metals
At low to moderate levels of strain (generally < 1.0) and at normal strain rates metals deform by slip or twinning. These processes can be related simply to the crystallography of the component grains. Whether they be etched features, surface relief effects or the dislocation configurations seen in the electron microscope, the manifestations of slip and twinning are easily recognized because of this crystallographic origin. At somewhat higher strain levels instabilities develop and shear bands form. These bands cross grain boundaries without deviation and although they are planar in form the planes involved are related to the specimen geometry and the deformation process rather than to the crystallography of the deforming material. The characteristics of shear bands are determined by many factors which include the method of straining, magnitude, temperature and rate of straining, grain size, crystallographic structure and in fcc metals the microstructure in which they form. This microstructure is determined by the orientation of the grain concerned and the stacking fault energy. This paper's concerned with experimental observations of shear bands, their role in deformation and their significance in the nucleation of recrystallized grains and the development of annealing textures.
- Research Organization:
- School of Metallurgy, University of N.S.W., Sydney
- OSTI ID:
- 6270453
- Journal Information:
- Scr. Metall.; (United States), Vol. 18:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METALS
DEFORMATION
SHEAR
TEXTURE
ANNEALING
CRYSTAL DEFECTS
CRYSTALLOGRAPHY
ELECTRON MICROSCOPY
ETCHING
GRAIN BOUNDARIES
GRAIN ORIENTATION
NUCLEATION
RECRYSTALLIZATION
SLIP
STRAIN RATE
STRAINS
SURFACE AREA
TWINNING
CRYSTAL STRUCTURE
ELEMENTS
HEAT TREATMENTS
MICROSCOPY
MICROSTRUCTURE
ORIENTATION
SURFACE FINISHING
SURFACE PROPERTIES
360103* - Metals & Alloys- Mechanical Properties