Understanding the enhanced ductility of Mg-Gd with Ca and Zn microalloying by slip trace analysis

• 作者: Jun Zhao Bin Jiang Yuan Yuan Qinghang Wang Ming Yuan Aitao Tang Guangsheng Huang Dingfei Zhang Fusheng Pan
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（36）
• 页码范围: 20-28
• 页数: 9页
• 语种: 英文

摘要

This research studied the mechanisms of Ca and Zn microalloying on the enhancement of ductility of extruded Mg-Gd sheet by combing electron backscattered diffraction and slip trace analysis.The ductil-ity and microstructure of extruded Mg-0,6Gd and Mg-0.6Gd-0.3Ca-0,2Zn (wt％) sheets were investigated.Basal slip was the main deformation mode under investigation.Ca and Zn microalloying increased the frequency of grain boundaries (GBs) with misorientation angles (θs) ＜ 35°,promoted slip transfer across GBs and restricted the basal slip localization.In addition,there were a higher number of GB cracks homo-geneously distributed in the Mg-0.6Gd sheet than in the Mg-0.6Gd-0.3Ca-0.2Zn sheet,attributed to the increased cohesion of GBs.The enhancement of basal slip,the suppression of slip localization and the suppression of GB cracking were contributed to the increased ductility for Mg-0.6Gd-0.3Ca-0.2Zn sheet.