Deformation Behavior of Cast and Annealed 2024 Al-alloy at Different Temperatures

doi:10.11901/1005.3093.2021.357

Chinese Journal of Materials Research

2022, Vol. 36

Issue (10): 730-738 DOI: 10.11901/1005.3093.2021.357

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Deformation Behavior of Cast and Annealed 2024 Al-alloy at Different Temperatures

YANG Bing¹, LIU Chunzhong¹(

), GAO Enzhi¹, SUN Wei², LIU Ting¹, ZHANG Hongning¹, ZHU Mingwei¹, LU Tianni¹

^1.School of Material Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
^2.Liaoning Zhongwang Group Co. Ltd., Liaoyang 111003, China

Cite this article:

YANG Bing, LIU Chunzhong, GAO Enzhi, SUN Wei, LIU Ting, ZHANG Hongning, ZHU Mingwei, LU Tianni. Deformation Behavior of Cast and Annealed 2024 Al-alloy at Different Temperatures. Chinese Journal of Materials Research, 2022, 36(10): 730-738.

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Abstract

Deformation behavior at different temperatures of the cast and annealed 2024 Al-alloy was investigated by means of MMS thermal simulation test machine. The constitutive equation and DMM (Dynamic material model) processing map of the alloy were established. The theoretical support for 2024 Al-alloy extrusion part with an extrusion ratio of 26.9 was provided by the results obtained from DMM map. The microstructures and mechanical properties of the alloys in different situations, namely, the cast plus post annealing, isothermally extruded and isothermally extruded plus post annealing were characterized by OM(Optical microscope), TEM (Transmission electron microscope) and tension tester. The results show that the test articles of 2024 Al-alloy experienced isothermal extrusion with large extrusion ratio can be obtained by strain rate within the range of 0.01~0.1 s^-1 at temperatures within 395~450℃, according to the proposed DMM processing map, consequently, the resulted test articles present refined microstructure with excellent mechanical properties.

Key words: metallic materials 2024 aluminum alloy stress-strain curve constitutive equation DMM processing map isothermal extrusion

Received: 16 June 2021

ZTFLH:

TG146

Fund: National Natural Science Foundation of China(51405310);Department Science and Technology of Liaoning Province(2019JH1/10100012);Educational Department of Liaoning Province(JYT19064)

About author: LIU Chunzhong, Tel: (024)89724198, E-mail: czliu@sau.edu.cn

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	Articles by authors
	Bing YANG
	Chunzhong LIU
	Enzhi GAO
	Wei SUN
	Ting LIU
	Hongning ZHANG
	Mingwei ZHU
	Tianni LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.357 OR https://www.cjmr.org/EN/Y2022/V36/I10/730

Fig.1 Schematic diagram of isothermal extrusion structural parts

Fig.2 Schematic diagram of tensile specimen (unit: mm)

Fig.3 Stress-true strain curves for the alloy at different strain rate

Fig.4 Relationship between peak stress, strain rate and deformation temperature of 2024 aluminum alloy under different deformation conditions (a) $l n ε ˙$ -σ, (b) $l n ε ˙$ -lnσ, (c) $l n ε ˙$ -ln[sinh(ασ)], (d) ln[sinh(ασ)]-T^-1

Table 1 Peak stress at different temperatures and strain rates

Fig.5 Relationship between flow stress and Zener-Hollomon parameter of 2024 aluminum alloy

Fig.6 3D maps of power dissipation of 2024 aluminum alloy

Fig.7 3D maps of rheological instability of 2024 aluminum alloy

Fig.8 DMM processing maps of 2024 aluminum alloy

Fig.9 As cast annealed microstructure of 2024 aluminum alloy

Fig.10 Extrusion structure of aluminum alloy 2024

Fig.11 TEM images of 2024 aluminum alloy (a) as cast annealed, (b) as extruded, (c) as extrusion annealed

Fig.12 Stress-strain curves of 2024 sample in different states at room temperature

Fig.13 Stress-strain curves of 2024 sample in different directions at room temperature

Table 2 Tensile test results of 2024 aluminum alloy in different states and directions

Fig.14 EBSD orientation map of 2024 alloy as extruded

Fig.15 grain boundary misorientation distribution map of 2024 alloy as extruded

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