Acopper-nickel alloy of composition 60 wt% ni-40 wt% cu is slowly heated from a temperature of 1250°c (2280 °f). (a) at what temperature does the first liquid phase form? (b) what is the composition of this liquid phase? (c) at what temperature does complete melting of the alloy occur? (d) what is the composition of the last solid remaining prior to complete melting? see animated figure 10.3a at what temperature, in ˚c, does the first liquid phase form? what is the composition of this liquid phase in wt% ni? at what temperature, in ˚c, does complete melting of the alloy occur? what is the composition, in wt% ni, of the last solid remaining prior to complete melting?