Abstract
The microstructural evolution and shear strength of the infrared brazed Cu and Ti with two silver-based braze alloys are studied. The dissolution between the molten braze and Cu substrate is much more prominent than that of Ti substrate. For specimens infrared brazed with pure Ag, the molten braze is separated into Ag-, Cu- and Ti-rich liquids. The Ag-rich liquid overflows out of the joint, so only the liquid rich in Cu and Ti is left in the joint. The joint is primarily comprised of Cu 4Ti and Cu 2Ti phases, and three interfacial reaction layers, CuTi 2, CuTi and Cu 4Ti 3 are observed after infrared brazing. For specimens infrared brazed with 72Ag–28Cu, the microstructural evolution is well elucidated by the Ag–Cu–Ti ternary alloy phase diagram, and its shear strength is strongly related to the presence of interfacial phases between Ti and the braze alloy.
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