Philosophical Magazine Letters
The nature of shear flow lines in equal-channel angular-pressed (ECAPed) metals has been investigated experimentally and theoretically. Experimental results indicate that, for metals pressed in a right-angle die, the shear flow lines often have an angle of similar to 27 degrees with respect to the extrusion direction. It is suggested that the shear flow lines are composed of a group of elongated grains with an elongation direction that deviates slightly from that of the shear flow lines.
关键词:
severe plastic-deformation
Physica Status Solidi a-Applied Research
The fatigue behavior of ultrafine-grained copper produced by equal channel angular (ECA) pressing was investigated at temperatures between room temperature and 573 K under a constant stress amplitude of 200 MPa. Cyclic softening was found to be much more evident and the corresponding fatigue life decreases rapidly as temperature increases. This phenomenon was considered as being the result of the grain coarsening and microstructural changes in the coarsened grains associated with the testing temperature. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
关键词:
severe plastic-deformation
