Heat capacity measurements of Ti-Al intermetallic compounds by heat-flux type differential scanning calorimetry with a triple-cell system

The heat capacities of TiAl and Ti₃Al intermetallic compounds in the temperature range between 600 and 1425K have been determined by the heat-flux type differencial scanning calorimeter (DSC). The deviation of the heat capacity value of the synthetic sapphire of α-Al₂O ₃ from the reference data was estimated to be within ±3%. The heat capacity values obtained in this work for TiAl and Ti₃Al intermetallic compounds are given as follows. TiAl: C_p(J· mol^-1·K^-1) = (48.7±6.6) + (13.3±5.4) × 10^-3T - (1.5±1.1) × 10⁶×T ^-2 (from 470 to 1425 K) Ti₃Al: C_p(J· mol^-1·K^-1) = (123.3±30.9) + (33.5±27.7)×10^-3T - (5.2 ± 4.4)×10 ⁶ × T^-2 (from 470 to 1425 K) The experimental uncertainty of the order of ±10% should be suggested for Ti-Al intermetallic compounds and this is mainly attributed to a condition that the sufficient amount of the sample is not available.