| High volume fraction Si C particle reinforced aluminum matrix composite is the ideal material for electronic packages in aerospace, instrumentation, automotive and other fields. However, the weld-ability of the material decreases, which results from the high fraction of Si C reinforced particulate. Cracks and need-like Al4C3 formed between the Si C and Al will seriously reduce the tensile strength of the weld joint.In this paper, high volume fraction(65%) Si Cp/Al aluminum matrix composite was jointed using TA2 as intermediate material by laser. The welding shape quality, mechanical properties and fracture behavior were investigated by single factor test and orthogonal test, respectively. The composition of weld seam and crystallization behavior was analyzed by SEM, EDS and XRD. The airtightness of package box was tested by Helium mass spectrometer leak detector.The results showed that the line energy of laser was of great influence on the quality of weld seam. Weld depth and weld width increased with the line energy increasing. Besides, laser power and the middle layer thickness had great influence on the tensile strength of the joint. When the laser power was 1200 W, the middle layer thickness was 0.3mm and the welding speed was 1.5m/min, the tensile strength of the joint was the highest, which reached 51% of the base material.The interface reaction between Al and Si C was restrained by in-situ reaction. The weld, with crystallization order of Ti Câ†'Ti5Si3â†'Ti3Al, was mainly consisted of Ti5Si3, Ti3 Al and Ti C. In addition, the in-situ reaction products could lead to upgrading weld micro hardness. Results of packing simulation showed that the gas leakage rate was 2.4×10-7Pa·m3/s, which was far below the requirement. |
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