Achieving high-plasticity pure aluminium from wire-based friction stir additive manufacturing
Zeyu Zhang, Long Wan, Yuming Xie, Qi Wen, Dongxin Mao, Wenjiang Dong, Xiuwen Sun, Huijia Tian, Xiangchen Meng, Yongxian Huang
Abstract
In the request for sustainable development in complex components manufacturing, designing room-temperature high-plasticity material with simpler alloys becomes paramount. Here, pure aluminium composed of homogenously equiaxed grain was achieved by wire-based friction stir additive manufacturing, exhibiting an ultimate tensile strength of 143 MPa and a uniform elongation of 52.1%. The significant enhancement in plasticity was attributed to the equiaxed grains sustaining huge plastic strains via grain boundary sliding and grain rotation. Dislocation/disclination motion was discovered for the activation mechanism of the grain boundary sliding and grain rotation. This discovery advances the tailoring approach to developing large-sized materials with higher plasticity.