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Constitutive behavior for quenching of Al-Cu-Mg alloy with consideration of precipitation

[+] Author and Article Information
Jianjun Wu

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
wujj@nwpu.edu.cn

Ruichao Guo

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
ytgrc@163.com

1Corresponding author.

ASME doi:10.1115/1.4040339 History: Received September 23, 2017; Revised May 07, 2018

Abstract

The deformation behavior of as-quenched 2024 Al-Cu-Mg alloy has been experimentally studied. The experiments are designed to cool specimens to the desired temperature with a constant cooling rate, i.e. 5 K/s. Isothermal tensile tests are performed over a range of 573-723 K temperature and (0.01, 0.1 and 1 s-1) strain rates to find out the flow stresses and microstructures after deformation. Due to the non-uniform deformation mechanisms (solid solution vs. solid solution and precipitation), two types of Arrhenius model are established for the temperature range of 573-673 K and 673-723 K, respectively. For temperature between 573 and 673 K, the activation energy is dependent on temperature and strain rate, and the value of activation energy decreases with the increases of temperature and strain rate. Compared with the ideal variation trend with no consideration of precipitation, the largest difference of activation energy is found at the tempera-ture of 623 K which is the nose temperature of 2024 alloy.

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