Journal
MATERIALS & DESIGN
Volume 32, Issue 10, Pages 4955-4960Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2011.05.040
Keywords
Non-ferrous metals and alloys; Microstructure; Plastic behavior
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In the field of deformation process modeling, the constitutive equations may properly represent the flow behavior of the materials. In fact, these valuable relationships are used as a calculation basis to simulate the materials flow responses. Accordingly, in the present study a hot working constitutive base analysis has been conducted on a 7075 aluminum alloy. This has been performed using the stress-strain data obtained from isothermal hot compression tests at constant strain rates of 0.004, 0.04 and 0.4 s(-1) deformation temperatures of 450, 500, 520, 550 and 580 degrees C up to a 40% height reduction of the specimen. A set of constitutive equations for 7075 Al alloy have been proposed employing an exponent-type equation. The related material constants (i.e., A, n and alpha) as well as the activation energy Q for each temperature regime have been determined. The correlation of flow stress to strain rate and temperature can be deduced from the proposed equations. Furthermore, a change in deformation mechanism has been realized in the semi-solid temperature range. This has been related to the onset of lubricated flow mechanism during processing. (C) 2011 Elsevier Ltd. All rights reserved.
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