Transient liquid phase diffusion bonding of Al/Mg_2Si metal matrix composite

摘要

As-cast Al/Mg_2Si metal matrix composite was joined by transient liquid phase diffusion bonding using Cu interlayer at various bonding temperatures and durations. This metal matrix composite contained 15% Mg_2Si and was produced through in situ technique by gravity casting. Specific diffusion bonding process was applied as a low vacuum technique. The microstructure of joints consisted of Al-α, CuAl_2 and Mg_2Si or Al-α and Mg_2Si depending on bonding temperature and duration. The maximum shear strength was achieved when samples were bonded at 580 ℃ for 120 min. Micro-hardness and compositional homogeneity of joints across the bonded interface were improved with increasing the bonding duration at 560 ℃ and had no significant changes at 580 ℃.