Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment

doi:10.11900/0412.1961.2019.00402

Acta Metall Sin

2020, Vol. 56

Issue (7): 1007-1014 DOI: 10.11900/0412.1961.2019.00402

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Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment

HAN Baoshuai¹, WEI Lijun¹^,², XU Yanjin¹(

), MA Xiaoguang¹, LIU Yafei¹, HOU Hongliang¹

1. AVIC Manufacturing Technology Institute, Beijing 100024, China
2. School of Materials Science and Engineering, Beihang University, Beijing 100083, China

Cite this article:

HAN Baoshuai, WEI Lijun, XU Yanjin, MA Xiaoguang, LIU Yafei, HOU Hongliang. Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment. Acta Metall Sin, 2020, 56(7): 1007-1014.

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Abstract

Ultra-high strength Al-Zn-Mg-Cu alloy is a promising lightweight structural material, and there is still room to improve its mechanical property. As a typical precipitation strengthening material, controlling the size and distribution of precipitate is an effective way to enhance the mechanical properties of the ultra-high strength Al-Zn-Mg-Cu alloy. The influence of pre-deformation on the microstructures and properties of the ultra-high strength Al-Zn-Mg-Cu alloy after ageing treatment was studied by TEM, XRD, SEM, DSC and tensile tests. The microstructures and the tensile mechanical properties of Al-Zn-Mg-Cu alloy without pre-deformation and with 3% and 4% pre-deformation were compared. It is found that the pre-deformation can promote the ageing precipitation rate and enhance the precipitate density in the Al-Zn-Mg-Cu alloy, and the pre-deformation ratio of 3% can promote the dispersion of the precipitate phase in the grain interiors, but the pre-deformation ratio of 4% may result in coarsening of precipitate. The size of precipitate along the grain boundaries and the width of precipitation free zones decreased in the pre-deformation treated ultra-high strength Al-Zn-Mg-Cu alloys. The tensile strength and yield strength of the pre-deformation treated ultra-high strength Al-Zn-Mg-Cu alloys increased, and the elongation also increased slightly, in which the tensile strength and elongation of 3% pre-deformation alloy combined with 80 ℃ for 12 h and 120 ℃ for 8 h ageing were (813±4) MPa and 10.10%±0.77%, respectively. The results show that the dislocations produced by pre-deformation may provide more heterogeneous nucleation sites for the precipitate formation, and improve the precipitate's distribution.

Key words: ultra-high strength Al alloy pre-deformation precipitate precipitation free zone mechanical property

Received: 25 November 2019

ZTFLH:

TG379

Fund: Defense Industrial Technology Development Program(JCKY2017205B032);National Natural Science Foundation of China(51971206)

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	Baoshuai HAN
	Lijun WEI
	Yanjin XU
	Xiaoguang MA
	Yafei LIU
	Hongliang HOU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00402 OR https://www.ams.org.cn/EN/Y2020/V56/I7/1007

Table 1 Ageing process parameters

Fig.1 XRD spectra (a) and local amplifications (b, c) of the solid solution Al-Zn-Mg-Cu alloy with different deformations

Fig.2 TEM images and SAED patterns (insets) (a, c, e, g), and HRTEM and high magnified images (insets) (b, d, f, h) of the ultra-high strength Al-Zn-Mg-Cu alloys with ageing process parameters of 12+8 (a, b), 3%+12+8 (c, d), 4%+12+8 (e, f) and 12+10 (g, h)

Fig.3 Intergranular precipitates morphologies of ultra-high strength Al-Zn-Mg-Cu alloy under different ageing process parameters (PFZ—precipitation free zone)
(a) 12+8 (b) 3%+12+8 (c) 4%+12+8 (d) 12+10

Table 2 Mechanical properties of ultra-high strength Al-Zn-Mg-Cu alloys under different ageing process parameters

Fig.4 Fracture morphologies of ultra-high strength Al-Zn-Mg-Cu alloy under different ageing process parameters
(a) 12+8 (b) 3%+12+8 (c) 4%+12+8 (d) 12+10

Fig.5 DSC curves of ultra-high strength Al-Zn-Mg-Cu alloys under different ageing process parameters

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