text: AuAl has low electrical conductivity and relatively low melting point. AuAl's formation at the joint causes increase of electrical resistance, which can lead to electrical failure. AuAl typically forms at 95% of Au and 5% of Al by mass, its melting point is about 575 °C, which is the lowest among the major gold-aluminum intermetallic compounds. AuAl is a bright-purple compound and a brittle, its composition is about 78.5% Au and 21.5% Al by mass. AuAl is the most thermally stable specie of the Au–Al intermetallic compounds, it has a melting point of 1060 °C (see phase diagram), which is similar to the melting point of pure gold. AuAl can react with Au, therefore is often replaced by AuAl, a tan-colored substancewhich forms at composition of 93% of Au and 7% of Al by mass. It is also a poor conductor and can cause electrical failure of the joint, which further lead to mechanical failure.