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Research Papers

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,
127 West Youyi Road,
Xi'an 710072, China
e-mail: wujj@nwpu.edu.cn

Ruichao Guo

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

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 23, 2017; final manuscript received May 7, 2018; published online June 22, 2018. Assoc. Editor: Said Ahzi.

J. Eng. Mater. Technol 140(4), 041009 (Jun 22, 2018) (10 pages) Paper No: MATS-17-1279; doi: 10.1115/1.4040339 History: Received September 23, 2017; Revised May 07, 2018

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 nonuniform deformation mechanisms (solid solution versus 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 temperature of 623 K which is the nose temperature of 2024 alloy.

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Figures

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Fig. 1

The dimensions of samples (unit: mm)

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Fig. 2

Schematic diagram of thermal history used in present experiments

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Fig. 3

Stress–strain curves of as-quenched 2024 alloy with different temperature and strain rates: (a) 573 K and 0.01–1 s−1; (b) 623 K and 0.01–1 s−1; (c) 673 K and 0.01–1 s−1; and (d) 723 K and 0.01–1 s−1

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Fig. 4

Deformation behavior of (a) strain hardening and (b) SRS for as-quenched Al–Cu–Mg alloy at different temperatures

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Fig. 5

Relationships of (a) ln ε˙ − ln(sinh(ασ)), (b) ln(sinh(ασ)) − 1/T at 573–673 K, (c) ln ε˙ − ln (sinh (ασ)), and (d) ln (sinh (ασ)) − 1/T at 673 − 723 K

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Fig. 8

Comparison of the flow stress between (a) experimental results and (b) predicted results at different conditions

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Fig. 7

Relationship between ln Z and ln[sinh (ασ)]

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Fig. 12

Evolution of total activation energy and activation energy of solid solution stress from 573 to 673 K

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Fig. 6

Relationships between (a) η − T, (b) S − ln ε˙, and (c) (T,ε˙) − lnA3

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Fig. 9

Evolution of activation energy from 573 to 673 K

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Fig. 10

A comparison of the evolution of activation energy between (a) present results and (b) Shi's results in Ref. [26]

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Fig. 11

TEM micrographs of 2024 alloy at a cooling rate of 5 K s−1 to 623 K: bright field images and its corresponding EDX analysis

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