2, Fe 2Al 5 and Fe 4Al 13]]>

摘要

AbstractThe heat capacity of three Fe-rich bcc-based Fe-Al alloys (35, 40 and 45?at.% Al) and of the three Al-rich intermetallicsζ(FeAl2),η(Fe2Al5) andθ(Fe4Al13) were measured by DSC between 120?K and their respective melting points. For the Fe-rich bcc-based alloys, the heat capacity was measured in the temperature range of the A2/B2 transition which reaches a maximum value of 54.7 and86.3J/K?molfor the samples with compositions of 35 and 40?at.% Al close to the order/disorder transition temperature of 1456 and 1555?K, respectively. The Debye temperature and the standard entropy values of the Al-rich intermetallic phasesζ(ΘD=455K,S298.15=24.45J/K?mol),η(ΘD=484K,S298.15=23.00J/K?mol) andθ(ΘD=469K,S298.15=23.65J/K?mol) were estimated based on low temperaturecpvalues. All three intermetallics and the 45?at.% Al sample show a non-linear increase incpby approaching the melting point which pro