Abstract
A high-strength brazable 4343/3003/6A02/3003 aluminum alloy laminar composite and its brazing-aging treatment process were studied for the lightweight of heat exchangers. The high strength which average maximum tensile strength of the composite reaches 298 MPa, and yield strength is up to 263 MPa after brazing-aging treatment, comes from the precipitation strengthening of nanoscale fine dispersed Mg2Si particles generated by the heat-treatable 6A02 layer, while the brazeability is ascribed to the effectively hindrance for the diffusion of Mg elements into the brazing layer and surface by 3003 barrier layer with a thickness ratio of 8%. Both air-quenching and water-quenching after brazing at 600°С for 10 min can simultaneously achieve the brazing joint and full solution treatment, while the maximum mechanical properties of the composite are obtained after aging at 200°С for 2 h. Brazing with air-quenching and aging process is friendly to industrial production, and meets the expected mechanical properties for lightweight of heat exchangers. The laminar structure design with different functional components provides a new strategy for brazed lightweight materials.
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