In this study, the joint at low temperature with nano-Al₂O₃ particles and Al₂O₃ nano+micro particles were fabricated by semisolid assisted ultrasonic vibration with nano-Al₂O₃ particle of 50 nm and volume fractions of 1% and micron-Al₂O₃ particle of 10 μm and volume fractions of 1%. The joints were examined in order to understand the effects of Al₂O₃ additions as microstructure, interface morphology and shear strength as well as mechanical properties of soldering 6061 aluminum alloys. Due to different size, the scallop-shaped solid solution layer was changed into a groove layer, and its thickness of Al₃Zn₂ solid solution layer was decreased. The grain refinement mechanism of Sn-9Zn-1nmAl₂O₃ is mainly sono-crystallization (enhanced nucleation). However, the grain refinement mechanisms of Sn-9Zn-1nm1μm Al₂O₃ change to be mainly sono-crystallization+ sono-fragmentation. With the increase of different size particles, the fracture mode transforms from brittleness to ductile fracture and finally to dimple structure. Micro particles may contribute less to the strength compared to the refining effect, but significantly improve the plasticity.

在这项研究中，通过在50 nm纳米Al ₂ O ₃颗粒和体积分数为1％的纳米Al ₂ O ₃颗粒进行半固态辅助超声振动来制造纳米Al ₂ O ₃颗粒和Al ₂ O ₃纳米+微粒的低温接头。10μm的微米-Al ₂ O ₃颗粒和1％的体积分数。为了了解Al ₂ O ₃的作用，对接头进行了检查添加了6061铝合金焊接的微观结构，界面形态和剪切强度以及机械性能。由于尺寸不同，扇贝形固溶体层变成沟槽层，并且其Al ₃ Zn ₂固溶体层的厚度减小。Sn-9Zn-1nmAl ₂ O ₃的晶粒细化机理主要是声结晶（增强形核）。然而，Sn-9Zn-1nm1μmAl ₂ O ₃的晶粒细化机理变化主要是声波结晶+声波破碎。随着不同尺寸颗粒的增加，断裂模式从脆性转变为韧性断裂，最后转变为凹坑结构。与细化效果相比，微粒可能对强度的贡献较小，但显着提高了可塑性。