Hypercooling and the thermodynamic properties of Cu-Ni alloys

The glass fluxing technique was used to undercool Cu-25%Ni, Cu-33%Ni, Cu-50%Ni and Cu-75%Ni alloy melts and their undercoolings were found to be 381 K, 380 K, 349 K and 431 K, respectively. Thermophysical simulation was used to get a linear relationship between the time duration of the thermal arrest t_a and the undercooling ΔT. The hypercooling limits ΔT_h derived from this relationship were 457.7 K, 461.1 K, 448.4 K and 528.3 K respectively for the four kinds of Cu-Ni alloys. The integral mean specific heat capacity c_PL was predicted using the hypercooling definition, which was considered as the ratio of the latent heat of fusion ΔH_m to the hypercooling limit ΔT_h. The c_PL of the four Cu-Ni alloys was found to be 0.442 J/(g·K), 0.451 J/(g·K), 0.490 J/(g·K) and 0.428 J/(g·K).