Why are coils of electric toasters and electric irons are made of an-alloy rather than a pure metal ?

The coils of electric toasters and electric irons are made of an alloy rather than a pure metal because the resistivity of an alloy is much higher than that of a pure metal, and also at high temperatures, the alloys do not melt easily i.e, the melting point of alloys is higher than that of pure metals to retain more heat without melting.