Hot Deformation Behavior of Al-7.2Zn-3.8Mg Alloy

doi:10.11901/1005.3093.2024.399

Chinese Journal of Materials Research

2025, Vol. 39

Issue (10): 734-742 DOI: 10.11901/1005.3093.2024.399

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Hot Deformation Behavior of Al-7.2Zn-3.8Mg Alloy

LI Qingqian¹^,², LIU Shengdan¹^,²(

), JIANG Keda¹^,³, FAN Shitong³, ZHAO Shourong³

1 School of Materials Science and Engineering, Central South University, Changsha 410083, China
2 Key Laboratory of Non-Ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
3 Taishan City Kam Kiu Aluminium Extrusion Co. , Ltd. , Taishan 529261, China

Cite this article:

LI Qingqian, LIU Shengdan, JIANG Keda, FAN Shitong, ZHAO Shourong. Hot Deformation Behavior of Al-7.2Zn-3.8Mg Alloy. Chinese Journal of Materials Research, 2025, 39(10): 734-742.

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Abstract

The hot deformation behavior of Al-7.2Zn-3.8Mg alloy was studied via gleeble thermal simulation tester by deformation rate of 0.01-0.1 s^-1 in temperature range 400-460 ^oC (lnZ range is 31.1 to 36.6) and then the constitutive equation was constructed. Meanwhile, the microstructure of the alloy was examined by electron backscatter diffraction technique and the dynamic softening mechanism was discussed. The results show that the activation energy of hot deformation of the alloy is 217.702 kJ/mol in the setting range of compression parameters and dynamic recovery is dominant softening mechanism. Dynamic recrystallization occurs at lnZ 34.3, and the recrystallization fraction decreases with the increase of lnZ; within this range, the mechanism includes continuous dynamic recrystallization and discontinuous dynamic recrystallization, and with the decrease of lnZ, the continuous dynamic recrystallization characteristics are more obvious; the geometric dynamic recrystallization appears for 31.1 lnZ 32.1.

Key words: metallic materials Al-Zn-Mg alloys constitutive equation microstructure dynamic softening mechanism

Received: 29 September 2024

ZTFLH:

TG146.2

Fund: 2023 Provincial Science and Technology Innovation Strategy Project of Guangdong Jiangmen(2023780200080009576)

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

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.399 OR https://www.cjmr.org/EN/Y2025/V39/I10/734

Table 1 Chemical compositions of Al-Zn-Mg alloy used for experiment (mass fraction, %)

Fig.1 Stress-strain curves of Al-Zn-Mg alloy (a) 0.1 s^-1; (b) 0.05 s^-1; (c) 0.01 s^-1

Fig.2 Relationship of $l n ε ˙$ -lnσ, $l n ε ˙$ -σ, $l n s i n h α σ$ - $l n ε ˙$ and $l n s i n h α σ$ -1/T (a) $l n ε ˙$ -lnσ; (b) $l n ε ˙$ -σ; (c) $l n s i n h α σ$ - $l n ε ˙$ ; (d) $l n s i n h α σ$ -1/T

Table 2 lnZ of each hot deformation parameter of Al-7.2Zn-3.8Mg alloy

Fig.3 Microstructure of the uncompressed sample (a) IPF image, (b) misorientation distribution image, (c) grain boundary image

Fig.4 IPF images and misorientation distribution at different temperatures under strain rate of 0.01 s^-1 (a, d) 460 ^oC; (b, e) 440 ^oC; (c, f) 400 ^oC

Fig.5 IPF images and misorientation distribution of the sample deformed at 460 ^oC with strain rate of 0.05 s^-1 (a) IPF image, (b) misorientation distribution image

Fig.6 Recrystallization distribution of Al-7.2Zn-3.8Mg alloy at different lnZ levels (a) lnZ = 36.6; (b) lnZ = 34.3; (c) lnZ = 33.1; (d) lnZ = 32.1; (e) lnZ = 31.1

Fig.7 Relationship curves between X_drx and lnZ

Fig.8 Grain boundary images and GND images under different lnZ (a, d) lnZ = 33.1; (b, e) lnZ = 32.1; (c, f) lnZ = 31.1

Fig.9 Schematic of two dynamic recrystallization evolutionary mechanisms (a) DDRX; (b) CDRX

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