Enhanced Mechanical Properties of Α-Phase La51 Alloy Using Caliber Rolling

This study investigates the microstructural evolution and mechanical properties of the Mg-5Li-1Al (LA51, wt.%) alloy, aimed at developing a high strength single-phase Mg-Li alloy. The alloy was successfully produced using caliber rolling (CR) with varying rolling reductions (i.e., 38%, 65%, 80%). The results indicate that CR effectively reduces the grain size from ~68.5 μm to ~8.1 μm. The primary mechanisms of grain refinement include continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), and twin-induced recrystallization (TDRX). With an increase in rolling reduction to 80%, the tensile yield strength (TYS), ultimate tensile strength (UTS), and elongation (El.) of the LA51 alloy reach 265.7 MPa, 324.2 MPa, and 11.9%, respectively. Furthermore, CR significantly enhances the tensile-compressive asymmetry of LA51 alloy as well. The improved mechanical properties of such alloy are attributed to grain refinement and dislocation strengthening mechanisms.

Keywords: Mg-Li alloy, Caliber rolling, Microstructure, mechanical properties

Suggested Citation: Suggested Citation

Yu, Hui and Li, Na and Ma, Hanyu and Yu, Wei and He, Zhixin and Xu, Qiong and Cheng, Weili and Park, Sung Hyuk and Shin, Kwang Seon and Liu, Chao, Enhanced Mechanical Properties of Α-Phase La51 Alloy Using Caliber Rolling. Available at SSRN: https://ssrn.com/abstract=5153417 or http://dx.doi.org/10.2139/ssrn.5153417