The Effect of the Stirring with a Large Size of Stirrer on Formation of the Composite Joint Reinforced with SiC Particle

Abstract

The stirring assisted brazing of SiCp/A356 composites with a large size of diameter in air was investigated. A first stirring was applied in brazing of the composites at 470°C. Then, it was continuously heated up to 510°C. Then, a secondary stirring with a large size (2.4mm) diameter was introduced in process. It was found that a composite joint reinforced with SiC particles can be obtained by stirring at 510°C. The experiment result shows that micro-hardness of joint brazed by 2nd stirring is obviously higher than that of joint brazed without 2nd stirring. Moreover, micro-hardness of the upper part of joint is slightly higher than that of the bottom part.

Trend and Development of Semisolid Metal Joining Processing

“…However, with increasing temperature the solid fraction of the filler alloy decreases quite significantly. In this process, the joining temperature is critical to achieving an ideal shape and a good microstructural interface at the joint [31,32].…”

“…In semisolid stir welding [32], indirect joining of semisolid substrates with the aid of mechanical stirring was carried out. In SSSJ during butt-joining there are different ways to create a localized semisolid pool either by using a gas heating system to heat up the nitrogen gas (shielding gas) or a resistance heating plate or an induction heating coil (vacuumfree).…”