Reducing the yield asymmetry in Mg-5Li-3Al-2Zn alloy by hot-extrusion and multi-pass rolling

• DOI: 10.1016/j.jma.2020.06.015
• Publication Date: 2020-09-29T16:54:35Z
• Authors: Xiaoqiang Li; Liang Ren; Qichi Le; Lei Bao; Peipeng Jin; Ping Wang; Chunlong Cheng; Xiong Zhou; Chenglu Hu
• Keywords: Texture (cosmology)

Reducing the yield asymmetry is very important concern for wrought Mg-Li alloys. In this study, Mg-5Li-3Al-2 Zn (LAZ532) alloy was successfully produced by hot-extrusion followed multi-pass rolling at 573 K. Microstructure evolution, mechanical properties and reducing of LAZ532 alloys different passes were studied. By observing microstructure using transmission electron microscopy showed that a small amount ultra-fine AlMg4Zn11 nano Li3Al2 phases existed in alloy. With increasing passes, grains obviously refined, comprehensive dramatically improved. Meanwhile, it also an excellent tension compression symmetry (TYS/CYS about 1). The results combined action weak {0001} basal lamellar texture, grain refinement addition Li element could effectively improve symmetry. Furthermore, based on theoretical analysis, strength mainly depended strengthening contributions LAGBs HAGBs, effect HAGBs most (∼50%) to improvement.