Synergic effect of hot deformation temperature and pre-straining on ageing precipitates and mechanical property of 2014 Al alloy

• Published in: Materials characterization 2020-09, Vol.167, p.110510, Article 110510
• Main Authors: Chen, Songyi, Li, Fushan, Chen, Kanghua, Huang, Lanping, Peng, Guosheng
• Format: Article
• Language: English
• Subjects: 2014 Al alloy; Ageing precipitates; Hot deformation temperature; Mechanical property; Microstructure; Pre-straining
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2020.110510

In the paper, the synergic effects of hot deformation temperature and pre-straining on microstructure and mechanical properties of 2014 Al alloy were investigated by tensile test combined with X-ray diffraction, electron backscattered diffraction and transmission electron microscopy. Results show that low-temperature deformation alloy presents lower yield strength compared with high-temperature deformation alloy due to the formation of high area fraction recrystallized grains and low-density coarse ageing precipitates. The pre-straining significantly improves yield strength for low-temperature deformation alloy, which was ascribed to the presence of high-density fine and uniform ageing precipitates. The combined mechanisms have been discussed in detail. •Low-temperature deformation alloy presented lower yield strength compared with high-temperature deformation alloy.•Pre-straining can significantly improve yield strength for low-temperature deformation alloy.•The mechanism of hot deformation temperature and pre-straining has been discussed.