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


Kawasaki, Megumi, Foissey, Julien and Langdon, Terence G. (2013) Development of hardness homogeneity and superplastic behavior in an aluminum–copper eutectic alloy processed by high-pressure torsion. Materials Science and Engineering A, 561, 118-125. (doi:10.1016/j.msea.2012.10.096).

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Description/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 ∼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.

Item Type: Article
ISSNs: 0921-5093 (print)
Related URLs:
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 345720
Date Deposited: 28 Nov 2012 14:10
Last Modified: 27 Mar 2014 20:27
URI: http://eprints.soton.ac.uk/id/eprint/345720

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