Journal
ACTA MATERIALIA
Volume 54, Issue 11, Pages 3015-3024Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2006.02.045
Keywords
aluminum alloys; cryomilling; mechanical properties; strain rate
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The strain-rate-dependent deformation behavior of bimodal 5083 At alloys processed by cryomilling is studied in the present investigation. The alloys were processed by hot extrusion of a mixture of cryomilled and unmilled At powders. Their tensile stress strain curves displayed a short work-hardening region, followed by a small stress drop after the ultimate stress while their tensile ductility increased with decreasing strain rates. Compressive stress-strain curves displayed a nearly perfect plastic behavior and negative strain rate sensitivity. Inspection of the deformation characteristics and fractography revealed that the higher ductility at lower strain rate was caused by effective diffusion-mediated stress relaxation, which delayed microcrack nucleation and propagation. Furthermore, crack blunting/bridging by ductile coarse grains played a significant role at lower strain rates. The phenomenon of the negative strain rate sensitivity of compression flow stress is proposed to be as a consequence of dynamic strain aging. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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