Mechanical and anisotropic behaviors of Mg–Li–Zn alloy thin sheets

• Published in: Materials in engineering 2008-12, Vol.29 (10), p.2061-2065
• Main Authors: Lin, Ying-Nan, Wu, Horng-Yu, Zhou, Geng-Zhong, Chiu, Chui-Hung, Lee, Shyong
• Format: Article
• Language: English
• Subjects: Anisotropy; Formability; Magnesium–lithium alloy
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2008.04.001

This study examined the mechanical property and formability of the cold-rolled Mg–Li–Zn alloy sheets with two different Li contents. Uniaxial tension and press-forming tests were carried out at room temperature. The tensile properties and formability parameters were correlated with the forming limit diagrams. The test results indicated that the Mg–Li–Zn alloy with a Li content of 6 wt% exhibited reasonable strength levels with moderate fracture elongation and that it did not show good stretchability and drawability at room temperature. The alloy with a Li content of 9 wt% presented excellent ductility even at room temperature and the strength levels were somewhat inferior. From the analysis, it was found that formability of the alloy with a higher Li content of 9 wt% was superior compared to that of the alloy with a Li content of 6wt%. Moreover, the fracture surfaces of the press-formed samples were considered and studied under a scanning electron microscope (SEM). The results showed that the partly ductile and partly brittle fracture pattern was observed in the tension–tension strain condition for both the alloys.