Enhanced ductility and strength of Mg-1Zn-1Sn-0.3Y-0.2Ca alloy achieved by novel micro-texture design

Abstract

Texture weakening is generally adopted as one of the prominent methods to improve the ductility of Mg alloys. In this work, we designed and fabricated the Mg-1Zn-1Sn-0.3Y-0.2Ca (wt. % ZTWX1100) alloy with a novel basal-random heterogeneous (BRH) texture by precisely controlled high-reduction rolling, which contained both basal- and random-oriented grains with a uniform distribution. Compared with the basal-texture sample, the BRH texture improved the ductility and tensile strength simultaneously, due to the operation of non-basal slips within basal-oriented grains and the strong work hardening ability contributed by the basal-random grain boundaries. Besides, the basal-random grain boundaries in BRH texture were beneficial to improve the deformation compatibility by transforming the dominant carrier of local stress from original random-oriented grains to basal-oriented ones. This work aims to provide new insight into improving the mechanical properties of Mg alloys by texture coordinated deformation.