Influence of Rolling Deformation on Microstructure and Mechanical Properties of Al-2Mg-0.8Cu(-Si) Alloy

doi:10.11901/1005.3093.2022.436

Chinese Journal of Materials Research

2023, Vol. 37

Issue (6): 463-471 DOI: 10.11901/1005.3093.2022.436

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Influence of Rolling Deformation on Microstructure and Mechanical Properties of Al-2Mg-0.8Cu(-Si) Alloy

LEI Zhiguo, WEN Shengping(

), HUANG Hui, ZHANG Erqing, XIONG Xiangyuan, NIE Zuoren

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Cite this article:

LEI Zhiguo, WEN Shengping, HUANG Hui, ZHANG Erqing, XIONG Xiangyuan, NIE Zuoren. Influence of Rolling Deformation on Microstructure and Mechanical Properties of Al-2Mg-0.8Cu(-Si) Alloy. Chinese Journal of Materials Research, 2023, 37(6): 463-471.

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Abstract

Rolling can accelerate the aging precipitation behavior, whilst shorten the incubation time for the emerge of peak aging. The Al-2Mg-0.8Cu alloy with 80% reduction reaches peak aging after annealing for 1 h. The maximum solid solubility of Si in Al-2Mg-0.8Cu alloy is 0.3% (mass fraction), which can further accelerate the kinetics process of aging precipitation and refine the size of S-phase. The Al-2Mg-0.8Cu-0.15Si alloy after cold rolling with 40% reduction achieved the properties of yield strength of 240 MPa, tensile strength of 353 MPa, elongation at break of 16.5% and tensile strength-plastic product of 5.66 GPa·%. 40% cold rolling reduction and addition of 0.15% Si (mass fraction) are the optimal process combination to obtain the best mechanical properties.

Key words: metallic materials Al-Mg-Cu cold rolling micro alloying microstructure mechanical property

Received: 15 August 2022

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2021YFB370902);National Key Research and Development Program of China(2021YFB3704204);National Key Research and Development Program of China(2021YFB3704205);National Natural Science Foundation of China for Innovation Research Project(5162-1003);Beijing Lab Project for Modern Transportation Metallic Materials and Processing Technology

Corresponding Authors: WEN Shengping, Tel: 13552521441, E-mail: wensp@bjut.edu.cn

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	LEI Zhiguo
	WEN Shengping
	HUANG Hui
	ZHANG Erqing
	XIONG Xiangyuan
	NIE Zuoren

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.436 OR https://www.cjmr.org/EN/Y2023/V37/I6/463

Table 1 Chemical composition of samples (mass fraction, %)

Fig.1 DSC curves of as-cast Al-Mg-Cu(-Si) alloy

Fig.2 BSE microstructure of the as-cast and as-solutionized treated microstructure (a) as-cast Al-2Mg-0.8Cu; (b) solid solution Al-2Mg-0.8Cu; (c) as-cast Al-2Mg-0.8Cu-0.15Si; (d) solid solution Al-2Mg-0.8Cu-0.15Si; (e) as-cast Al-2Mg-0.8Cu-0.30Si; (f) solid solution Al-2Mg-0.8Cu-0.30Si

Fig.3 SEM and EDS result of as-cast Al-2Mg-0.8Cu-0.30Si

Table 2 EDS results of the as-cast Al-2Mg-0.8Cu-0.30Si alloy ( atomic fraction, %)

Fig.4 Phase diagram of Al-Mg-Cu alloy

Fig.5 SEM images of Al-2Mg-0.8Cu-0.50Si (a) as-cast; (b) solid solution

Table 3 EDS results of the primary phase in as-cast Al-2Mg-0.8Cu-0.50Si alloy ( atomic fraction, %)

Fig.6 SEM and EDS of residual primary phase in as-cast Al-2Mg-0.8Cu-0.50Si alloy

Fig.7 Hardness curve of Al-Mg-Cu(-Si) alloy after isothermal annealing at 175℃ (a) deformation of 40% ; (b) deformation of 80%

Fig.8 Tensile properties of cold rolling Al-2Mg-0.8Cu(-Si) alloy (a) deformation of 40%; (b) deformation of 80%

Fig. 9 Tensile properties of cold rolling Al-2Mg-0.8Cu(-Si) alloy annealing at 175℃ (a) Al-2Mg-0.8Cu; (b) Al-2Mg-0.8Cu-0.15Si; (c) Al-2Mg-0.8Cu-0.30Si; (d) Al-2Mg-0.8Cu-0.50Si

Fig. 10 Tensile properties of cold rolling Al-2Mg-0.8Cu(-Si) alloy annealing at 175℃ (a) Al-2Mg-0.8Cu; (b) Al-2Mg-0.8Cu-0.15Si; (c) Al-2Mg-0.8Cu-0.30Si; (d) Al-2Mg-0.8Cu-0.50Si

Fig.11 TEM images of 40% deformation cold-rolled Al-2Mg-0.8Cu alloy annealed at 175℃ for (a) 4 h；(b) 8 h；(c) 120 h

Fig.12 TEM images of 80% deformation cold-rolled Al-2Mg-0.8Cu alloy annealed at 175^oC (a, b) 1 h, (c, d) 2 h, (e, f ) 120 h

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