Besides that the requirement for brazing filler metals suitable for Al-matrix composites can be used in the temperature range of about 450–550 °C, there is a more general need for filler metals that have good wettability with nickel or gold platting layer. The available range is severely limited to materials that are either intrinsically expensive because they contain a large proportion of gold, or they are brittle and cannot be produced in the form of foil and wire preforms. The first type of alloy is represented by 82.7Au-14Ag-3.3Si and 58.5Au-19.5Ag- 22Ge eutectic alloys, with melting points of 457 °C and 450 °C, respectively [37 and 38]. While the second type is Al-based brazing filler, such as 63Al-16.5Ag-20.5Ge and 40.0Al-40.7Ag-19.3Cu, with the melting points of 414.5 °C and 500 °C, respectively [39 and 40]. Previous attempts to develop low-melting-point filler metals for brazing Al-matrix composites have not met with commercial requirement due to the poor mechanical properties of the alloys, corrosion of the joints, toxicity, high cost of constituent metals and volatility of the constituents.