Hot Compression Deformation Behavior of 6013 Aluminum Alloy by Low lnZ

doi:10.11901/1005.3093.2023.323

Chinese Journal of Materials Research

2024, Vol. 38

Issue (5): 337-346 DOI: 10.11901/1005.3093.2023.323

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Hot Compression Deformation Behavior of 6013 Aluminum Alloy by Low lnZ

WU Yingming¹^,², JIANG Keda¹^,³, LIU Shengdan¹^,²^,³(

), FAN Shitong⁴, QIN Qiuhui¹^,³, LI Jun¹^,³

^1.School of Materials Science and Engineering, Central South University, Changsha 410083, China
^2.National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China
^3.Key Laboratory of Non-Ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
^4.Taishan City Kam Kiu Aluminium Extrusion Co., Ltd. Postdoctoral Innovation Base, Taishan 529261, China

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WU Yingming, JIANG Keda, LIU Shengdan, FAN Shitong, QIN Qiuhui, LI Jun. Hot Compression Deformation Behavior of 6013 Aluminum Alloy by Low lnZ. Chinese Journal of Materials Research, 2024, 38(5): 337-346.

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Abstract

The hot deformation behavior of 6013 Al-alloy at 530~575^oC and strain rate of 0.001~0.1 s^-1 was studied by hot compression simulation test. Based on the electron backscatter diffraction technique, the microstructure evolution and dynamic softening mechanism were discussed, while the so called Zener-Hollomon (Z) parameter was adopted to represent the combined effect of deformation temperature and strain rate. The results show that the flow stress of the alloy increases with the increase of ln Z, and the deformation activation energy of the alloy under steady state condition is 217.3 kJ/mol. With the increase of lnZ, the recrystallization area fraction and sub-grain size tend to decrease linearly. For 23.91 ≤ lnZ < 29.55, dynamic recrystallization is the main softening mechanism, in which geometric dynamic recrystallization is dominant. For 29.55 < lnZ ≤ 30.24, dynamic recovery is the main softening mechanism.

Key words: metallic materials 6013 aluminum alloy constitutive equation microstructure evolution softening mechanism

Received: 03 July 2023

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2023YFB3710404)

Corresponding Authors: LIU Shengdan, Tel: (0731)88830265, E-mail: lsd_csu@csu.edu.cn

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	WU Yingming
	JIANG Keda
	LIU Shengdan
	FAN Shitong
	QIN Qiuhui
	LI Jun

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.323 OR https://www.cjmr.org/EN/Y2024/V38/I5/337

Table 1 Chemical compositions of 6013 aluminum alloy (mass fraction, %)

Fig.1 OM image of homogenized 6013 aluminum alloy ingot

Fig.2 True stress-strain curves at different strain rates (a) 0.001 s^-1, (b) 0.01 s^-1, (c) 0.1 s^-1

Fig.3 Relationship between steady-state stress, strain rate and deformation temperature of 6013 aluminum alloy under different deformation conditions (a) ln $ε ˙$ -lnσ, (b) ln $ε ˙$ -σ, (c) ln $ε ˙$ -ln[sin(ασ)], (d) ln[sin(ασ)]-1000/T

Table 2 lnZ under different thermal deformation conditions at true strain 1.0

Fig.4 IPF images and misorientation distribution at different temperatures and strain rates of 0.1 s^-1 (a, a1) 530^oC, (b, b1) 545^oC, (c, c1) 560^oC, (d, d1) 575^oC

Table 3 Average equivalent circle size of grains under different thermal deformation conditions

Fig.5 IPF images and misorientation distribution at different strain rates and deformation temperature of 560^oC (a, a1) 0.001 s^-1, (b, b1) 0.01 s^-1

Fig.6 Recrystallization area fraction and sub-grain size under different lnZ (a) recrystallization area fraction, (b) sub-grain size

Fig.7 Grain boundary diagram and the corresponding GND diagram under different lnZ value (a, e) 24.47, (b, f, i) 26.77, (c, g, j) 28.52, (d, h, k) 30.24

Fig.8 Schematic of two geometric dynamic recrystallization mechanism (a) mechanism 1, (b) mechanism 2

Fig.9 Schematic of two continuous dynamic recrystallization mechanism (a) mechanism 1, (b) mechanism 2

Fig.10 Schematic of two discontinuous dynamic recrystallization mechanism (a) mechanism 1, (b) mechanism 2

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