ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 29    No. 11    November 2019

Is Ashby grain-boundary hardening model applicable for high strains?
S. MALOPHEYEV, I. VYSOTSKIY, S. MIRONOV, R. KAIBYSHEV
(Belgorod National Research University, Pobeda 85, Belgorod 308015, Russia)
Abstract: This work was undertaken to evaluate the applicability of the Ashby grain-boundary hardening model for a high strain range. To this end, Al-Mg alloy with distinctly different grain sizes (~100 μm vs ~1 μm) was cold-rolled to a true strain of ~1.6 and the resulting dislocation densities were compared by using transmission electron microscopy. A minor difference revealed by the measurements suggested a violation of the Ashby’s model. This effect was attributed to a partial relaxation of strain constraints due to significant change of grain shape, development of texture and formation of pronounced substructure.
Key words: large plastic strain; strain compatibility; dislocations
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU) 湘ICP备09001153号