材料科学
等轴晶
晶间腐蚀
焊接
开裂
成核
铝
空隙(复合材料)
冶金
极限抗拉强度
复合材料
腐蚀
微观结构
化学
有机化学
作者
Yuqing Hu,Shengchuan Wu,Yi Guo,Zhao Shen,Alexander M. Korsunsky,Yukuang Yu,Xu Zhang,Yanan Fu,Zhigang Che,Tiqiao Xiao,Sergio Lozano-Pérez,Yuan Qin,Xiangli Zhong,Xiaoqin Zeng,Guozheng Kang,Tim L. Burnett
标识
DOI:10.1038/s41467-022-33188-x
摘要
Cracking from a fine equiaxed zone (FQZ), often just tens of microns across, plagues the welding of 7000 series aluminum alloys. Using a multiscale correlative methodology, from the millimeter scale to the nanoscale, we shed light on the strengthening mechanisms and the resulting intergranular failure at the FQZ. We show that intergranular AlCuMg phases give rise to cracking by micro-void nucleation and subsequent link-up due to the plastic incompatibility between the hard phases and soft (low precipitate density) grain interiors in the FQZ. To mitigate this, we propose a hybrid welding strategy exploiting laser beam oscillation and a pulsed magnetic field. This achieves a wavy and interrupted FQZ along with a higher precipitate density, thereby considerably increasing tensile strength over conventionally hybrid welded butt joints, and even friction stir welds.
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