Physics – Condensed Matter – Statistical Mechanics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006smpr.confe..42b&link_type=abstract
Proceedings of the International conference on Statistical Mechanics of Plasticity and Related Instabilities. August 29-Septembe
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
The plastic flow behaviour of two ω forming systems namely ordered Nb-40Ti-15Al and metastable Zr-Nb alloys has been studied over a range of strain rate and temperature to establish the domain of serrated flow or Protevin-Le Chatelier (PLC) effect. The observed features of serrated flow in these alloys are strikingly similar to that observed during PLC effect of solid solution alloys. Samples deformed in the serrated flow regime have been studied at different levels of magnification using light, scanning electron and transmission electron microscopy. A very characteristic feature of deformation in these alloys has been the presence precipitate free channels, microbands and deformation bands. The proposed mechanism of serrated flow involves creation of soft channels formed by shearing of ω-particles and dynamic restoration of ω-particles within the soft channel resulting in pinning of dislocation. It appears that this is the characteristic feature of deformation of ω forming system exhibiting PLC effect.
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