Origin of extension twinning-mediated static recrystallization and unique parallel alignment of(0001) poles to transverse direction in Mg-3Al-0.4Mn(mass%) alloy sheet

作     者：T.Nakata C.Xu L.Geng S.Kamado 

作者机构：Nagaoka University of Technology1603-1KamitomiokaNagaoka 940-2188Japan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第9期

页      面：3200-3213页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by JSPS KAKENHI Grant Numbers JP22H00259,JP22K18900,JP21H01669 The Light Metal Educational Foundation,Inc.,Japan National Natural Science Foundation of China (51971075,52220105003) National Key Research & Development Program of China (2021YFB3703300,2022YFE0110600) 

主　　题：Magnesium Rolling Twinning Static recrystallization Texture 

摘      要：The origin of unique parallel alignment of(0001) poles to transverse direction(TD) was investigated using Mg-3Al-0.4Mn(mass%)alloy sheets rolled with different process conditions. When rolling was performed with intermediate reheating, the alloy showed a sluggish static recrystallization(SRX) behavior during post-annealing, facilitating the nucleation and growth of statically recrystallized grains from extension twins. This resulted in the apparent texture component with the parallel alignment of the(0001) poles to the TD, and the sheet exhibited good ductility for both the rolling direction(RD) and TD. In contrast, continuous rolling without intermediate reheating led to the formation of severely deformed regions near double twins. SRX was promoted at such regions, forming a typical basal textural feature with weak RD-split of the(0001) poles. Although extension twins were formed after the continuous rolling, SRX was facilitated at the severely deformed regions with double twins, and the formation of the unique alignment of the(0001) poles to the TD was suppressed. The RD-split texture led to the large elongation to failure along the RD, while it along the TD decreased owing to the narrow distribution of the(0001)poles toward the TD, resulting in the in-plane anisotropy in ductility.