Effect of free-end torsion on microstructure and mechanical properties of AZ31 bars with square section

• 作者: BO Song Zhiwen Du Ning Guo Qingshan Yang Fang Wang Shengfeng Guo Renlong Xin
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（10）
• 页码范围: 20-31
• 页数: 12页
• 语种: 英文

摘要

In this study,a rolled AZ31 bar with square section was used.The reciprocating torsion was performed to maintain the shape of the sample.The microstructure evolution of AZ31 bar during torsion and its influence on compressive anisotropy were investigated in detail.Results showed that reciprocating torsion can simultaneously enhance yield strength in three compressive directions,and reduce compressive anisotropy.Reciprocating torsion generated profuse dislocations and { 10-12} twin boundaries to harden the micro-hardness and yield strength.Reciprocating torsion can also generate new texture component which is mainly from the orientation of newly generated {10-12} twins.The new twin-structures will be responsible for the reduction in compressive anisotropy.Moreover,uneven deformation features in twisted sample were systematically investigated.