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Microstructure evolution, slip patterns and flow stress
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DOI：10.1016/S0921-5093(01)01028-0.png)
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The development of deformation microstructures in medium to high stacking fault energy fcc metals is reviewed illustrating that the basic microstructural element is a cell block. The elongated cell blocks are defined by extended nearly planar boundaries that lie on special planes and enclose a group of approximately equiaxed cells. This duplex structure persists throughout Stage H-M What is known about the origins of these structures and the role of the slip pattern is reviewed. Taking all the measurable structural parameters with respect to the cell blocks: spacing. misorientation angle, and dislocation density, and assuming additive strength contributions, flow stress predictions are derived from Hall-Petch and dislocation strengthening. These predictions are in good agreement with the stress values and hardening rates observed experimentally. (C) 2001 Elsevier Science B.V. All rights reserved.
Keyword:
dislocations
scaling
flow stress
slip pattern
dislocation boundaries
misorientation angle
Stage III
Stage IV
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