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Development of hardness homogeneity and superplastic behavior in an aluminum-copper eutectic alloy processed by high-pressure torsion

Title
Development of hardness homogeneity and superplastic behavior in an aluminum-copper eutectic alloy processed by high-pressure torsion
Author
Megumi Kawasaki
Keywords
SEVERE PLASTIC-DEFORMATION; STRAIN RATE SUPERPLASTICITY; MICROSTRUCTURAL EVOLUTION; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; ACTIVATION-ENERGY; PURITY ALUMINUM; CU ALLOY; AL; FLOW
Issue Date
2013-01
Publisher
Elsevier Science SA
Citation
Materials Science & Engineering A, 2013, 561, P.118-125
Abstract
An Al-33% Cu eutectic alloy was processed by high-pressure torsion (HPT) at a pressure of 6.0 GPa for 1/4 to 10 turns. Examination after processing showed a gradual evolution to a reasonable level of hardness and microstructural homogeneity after 5 or more turns. Tensile tests were conducted at a temperature of 723 K on specimens processed through 5 and 10 turns of HPT. These specimens exhibited excellent superplastic properties with a maximum elongation of similar to 1250% at strain rates lower than 10(-3) s(-1). The results also showed that the maximum elongation is displaced to a faster strain rate when the HPT processing is conducted to a higher number of turns. An analysis demonstrates that superplastic flow in the Al-Cu alloy processed by HPT is well described by a theoretical relationship that was developed for conventional superplastic materials. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0921509312015316http://hdl.handle.net/20.500.11754/41494
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2012.10.096
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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