Twinning via the motion of incoherent twin boundaries nucleated at grain boundaries in nanocrystalli

• 作 者: 宋旼;
• 机 构: 中南大学
• 出 处: 第六届海内外中华青年材料科学技术研讨会暨第十五届全国青年材料科学技术研讨会
• 发表日期: 2015年期

　　We report the formation of deformation twins in nanocrystalline Cu alloys with medium stacking fault energy via the propagation of □ 3 {112} incoherent twin boundaries(ITBs)that are nucleated from grain boundaries.This deformation twinning process does not generate net macroscopic strain since the Burgers vectors of the three partial dislocations on three successive { 111 } planes comprising an ITB sum to zero.The moving direction of ITBs determines the occurrence of twinning or detwinning in nanocrystalline materials.