Hot Deformation Behavior and Constitutive Equation of 5E61 Aluminum Alloy

Abstract:

The hot deformation behavior of aluminum alloy 5E61 was studied by hot compressive tests using a Gleeble-1500 thermal simulator. The tests were performed at temperatures varying from 250°C to 500°C and strain rates ranging from 0.001 s^-1 to 10s^-1. The results achieved in the present study showed that the steady flow stress increases with decreasing temperature and increasing strain rate, in accordance with the Zener-Hollomon parameter. The related microstructure is sensitive to deformation temperature, strain rate and strain. The constitutive equation based on true stress-true strain curves has been developed by hyperbolic sine equation with the hot deformation activation energy of 153.907KJ/mol. The softening mechanism could be ascribed dominantly to dynamic recovery. The results of TEM observation suggested that Mn-containing particles and Al₃(Er,Zr) phase have precipitated in the aluminum matrix and pin the dislocations, which could effectively inhibit the dynamic recrystallization.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 9-16
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.9
• Online since: June 2017
• Authors: Ya Liu*, Hui Huang, R. Liu, Sheng Ping Wen, Xiao Lan Wu, Kun Yuan Gao, Zuo-Ren Nie
• Keywords: 5E61 Alloy, Constitutive Equation, Hot Deformation Behavior, Microstructural Evolution

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