Influence of Al-Si eutectic alloy on the mechanical behaviors and microstructure feature of ultralight dual-phase Mg-8Li-x(Al-12.6 Si) alloys. (March 2022)

• Record Type: Journal Article
• Authors: Zhao, Zilong; Zhuang, Yuanlin; Wang, Tao; Zhao, Dongshan; Wu, Xin
• Is Part Of: Materials today communications. Volume 30(2022)
• Publication Date: 2022-03
• Subjects: Magnesium alloy -- Al-Si eutectic alloy -- Precipitation -- Strengthening -- Mechanical properties; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.103201
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Ultra-lightweight Magnesium(Mg)-Lithium(Li)-base alloys exhibit a much better ductility than other Mg alloys due to the existence of a body-centered cubic (BCC) structured Li phase. The addition of Al-Si eutectic significantly improves the tensile strength but greatly deteriorates the ductility. In this paper, a new Mg-8Li-4(Al-12.6 Si) alloy with a good balance of ultimate tensile strength, yield strength and fracture elongation (230 MPa, 175 MPa and 14.0%, respectively) was designed and fabricated. Mechanical tensile tests were conducted for Mg-8Li-x(Al-12.6 Si) serial alloys at first. The Mg-8Li-4(Al-12.6 Si) alloy was demonstrated to present superior mechanical properties among the serial alloys. Thereafter, the microstructure features were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The good mechanical properties of Mg-8Li-4(Al-12.6 Si) were demonstrated to be caused by the precipitation strengthening effect from the nano-sized Al0.9 Li0.1 phase. The results could contribute to the development of high-ductility and high-strength Mg-Li-base alloys and promote the widespread applications.