Abstract
Obviously planar anisotropy due to'TD split'orthotropic texture(TD indicates Transverse direction)al-ways exist in the Rare-earth(RE)or Ca containing Mg alloy sheets,which is likely caused by the low-reduction rolling(and annealing)as revealed in our previous research.In this work,the as-cast billets of a ZWK100 alloy were subjected to final-pass heavy reduction rolling(FHRR)at 500℃with different reductions(30％-70％)after rough rolling,aiming to investigate the reduction effect on the microstruc-ture and texture formation.The results show that FHRR with higher reductions above 50％is in favor of shear banding formation but has little effect on the as-deformed texture components,and the excel-lent formability with single-pass reduction up to 70％is mainly ascribed to the activation of prismatic<a>slip.FHRR with reduction above 50％and annealing can generate uniform grain structures of～10 μm and symmetrical'oblique-line split'texture in(0001)pole figures,with basal poles tilting by about 50° from ND(Normal direction)towards some oblique-line of TD and RD(Rolling direction)as well as uniform distribution of counter lines as an annular shape,resulting in excellent elongation to failure of～50％and ultra-low planar anisotropy △r2 of～0.1 and high stretch formability(Erichsen value:8.1).The formation'oblique-line split'texture in(0001)pole figures is mainly correlated with the preferred growth tendency of grains with[2111]-[1212]//RD,which was suggested to relate to the high mobility of some special boundaries such as 40°-45°[1010](∑14).The influences of starting textures on the mechanical properties,planar anisotropy and related deformation modes,as well as their correlations with the stretch formabil-ity were comparatively investigated with the'TD split'orthotropic texture as a counterpoint.
基金项目
Basic and Applied Basic Research Fund of Guangdong Province of China(2019A1515110573)
国家自然科学基金(51901047)
Special Innovation Projects of Universities in Guangdong Province(2018KTSCX240)
Key Project of Depart-ment of Education of Guangdong Province(2016GCZX008)
Project of Engineering Research Center of Foshan(20172010018)
NETL
NSTL
维普
万方数据