Effect of ageing treatment process on the microstructure development and mechanical properties of 6082 Al alloy

• Published in: Journal of alloys and compounds 2023-02, Vol.935, p.167892, Article 167892
• Main Authors: Xu, Xuehong, Zhu, Wenbo, Guo, Xiaobin, Liang, Chaojie, Deng, Yunlai
• Format: Article
• Language: English
• Subjects: 6082 Al alloy; ageing treatment process; mechanical properties; microstructure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.167892

Different ageing treatment process was conducted to improve the mechanical properties of 6082 Al alloy. Tensile results show that as compared to the T6 sample, the ultimate tensile strength, yield strength and elongation of the T6I6 sample increase by 3.2%, 3.5%, and 47.3%, respectively, the ultimate tensile strength, yield strength and elongation of the RD+T6I6 sample increase by 12.9%, 11.8% and 12.5%, respectively. Microstructural results reveal that holding at 65 ºC for 336h after pre-ageing promotes the formation of GP zones and stimulates the transformation of GP zones into β" precipitates during subsequent ageing at higher temperature. The introducing of the asymmetric rolling deformation after pre-ageing can reduce the average grain size, induce high-density dislocations and increase the average Taylor factor (M) due to the increasing of S and Brass texture. The dislocations have a good effect on the formation of fine β" precipitates during subsequent ageing. This microstructure is responsible for the improvement of the mechanical properties. [Display omitted] ●The T6I6 significantly increases the El and the RD+T6I6 obviously enhances the strength.●The holding at 65 ℃ for 336h promotes the formation of GP zones and stimulates the transformation of GP zones into β" precipitates.●The asymmetric rolling deformation can reduce the average grain size and induce high-density dislocations.●The asymmetric rolling deformation can increase deformation texture of S and Brass orientation and therefore increases the average Taylor factor.