Abstract
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-1 nmAl2O3 is mainly sono-crystallization (enhanced nucleation). However, the grain refinement mechanisms of Sn-9Zn-1 nm1 μm 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.
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