in-situ reinforced active liquid-phase diffusion welding method of aluminium base composite and three-element active solder of Al-Cu-Ti system

Abstract

The invention discloses an in-situ reinforced active liquid-phase diffusion welding method using a three-element active solder containing melting-point-rising active elements, and discloses an Al-Cu-Ti three-element active solder suitable for a cast-aluminium-based composite material. The method enables the interfaces of aluminium matrix / soldering seam and ceramic reinforced phase / soldering seam to be compact and can realize in-situ reinforcement for a soldering seam. Due to the capacity of realizing in-situ reinforcement for a soldering seam, the method has the prominent advantages that: on one hand, a soldering seam matrix becomes solid solution after melting-point-depressing elements diffuse to an aluminium matrix; on the other hand, the relative concentrations of the melting-point-rising active elements automatically rise in the soldering seam due to the difficulty to diffuse in the aluminium matrix of the melting-point-rising active elements, so that a submicron-sized or micron-sized three-element intermetallic compound reinforced phase containing the dispersive distribution of the melting-point-rising active elements is enough to be formed in situ in the soldering seam, thereby obtaining a high-quality soldering seam using the fine and infusible three-element intermetallic compound as a reinforced phase and using the solid solution as a matrix. When 10 Vol.% SiCp / ZL101 is welded at 550 DEG C, the shear performance achieves 99.7% of parent material; and a fracture can penetrate in the parent material and is not completely located in the interface.

Description

Technical field:

[0001] The invention relates to an aluminum-based composite material welding method and the used welding material—brazing filler metal. In particular, a method of "in situ enhanced active liquid phase diffusion welding" (In situ A-TLP) using a ternary active solder containing melting-type active elements was proposed; Composition design results and preparation methods of the Al-Cu-Ti system ternary active solder of the new process. Background technique:

[0002] As the low-cost technology for the preparation of aluminum matrix composites becomes more and more mature, the commercial scope of aluminum matrix composites is becoming more and more extensive. The current main preparation methods are: stirring casting, squeeze casting, pressureless impregnation, powder metallurgy and so on. Among them, stirring casting is widely accepted because of its low cost and easy operation. SiCp / ZL101 aluminum matrix composite material can be prepared by stir casting or s...

Images