多元系B2相的热力学描述

A thermodynamic description of a multicomponent B2 phase

B2相广泛存在于铁基、钴基和镍基合金中.B2相的析出对于合金组织和性能具有重要影响.本文指出了合理描述B2相的热力学模型,并就如何简单有效地描述多元合金系中的B2相,以及如何处理在此过程中可能出现的各种问题,进行了深入的探讨和研究.

An ordered B2 phase widely exists in Fe-, Co- and Ni-based alloys, and insert important effects on the microstructures and mechanical properties of these alloys. In developing a multicomponent thermodynamic database, it is still a problem to establish a thermodynamic description of a B2 phase. By comparing several thermodynamic models available for a B2 phase, it was proposed that a modified two-sublattice model is the most suitable to describe a multicomponent B2 phase. Some problems that could be encountered in making a thermodynamic description of a B2 phase have been discussed, and it was suggested that more attention should be paid to the phenomenon such as a possible metastable A2 and B2 phase as well as a magnetic contribution to the ordering, which are often ignored in assessing a binary or ternary system.