Abstract
Direct laser welding, laser welding with Ti interlayer, and ultrasonic-assisted laser welding with Ti interlayer were used to join SiCp/6061 Al matrix composites. Microstructural evolutions, compositional distributions and tensile strengths under three processes were compared and analyzed. The experimental results showed that ultrasonic-assisted laser welding with Ti interlayer can obtain joints with good continuity and without obvious defects. Due to combined effects of Ti interlayer and ultrasonic, formation of brittle Al4C3 phase was greatly suppressed and fine TiC precipitates were also uniformly distributed in weld metal. The strength shown by the welded joints could reach up to 77.2% of the strength of the base material. Because of the internal defects (voids and pores) and the generated large numbers of brittle phases of Al4C3 in weld metal, the joint strength shown by the other two techniques, direct laser welding and laser welding with Ti interlayer, only reached 49.4 and 64.8% of the base material strength, respectively.
Highlights
Silicon carbide particles (SiCp) reinforced aluminum matrix composites (AMCs) have significant advantages such as high specific strength and specific modulus, low thermal expansion coefficient, excellent thermal conductivity and corrosion resistance
A few pores existed in heat affected zone and some irregular shaped shrinkage voids appeared in weld metal, which would weaken the tensile strength of the welded joint
Laser welding with Ti interlayer, and ultrasonic-assisted laser welding with Ti interlayer were used to joint SiCp/6061 Al matrix composites
Summary
Silicon carbide particles (SiCp) reinforced aluminum matrix composites (AMCs) have significant advantages such as high specific strength and specific modulus, low thermal expansion coefficient, excellent thermal conductivity and corrosion resistance. They are widely used in aerospace, aviation, ocean and automobile fields (Xie et al, 2021a; Mao et al, 2021; Xu et al, 2021). High hardness of SiC particles will reduce the service life of the stirring head, which will introduce extra cost the for industrial applications in large scale
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