Ordering and phase separation of the BCC phase in the Fe-Cu-Al system

Cui Ping Wang, Xing Jun Liu, Ikuo Ohnuma, Ryosuke Kainuma, Shi Ming Hao, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Phase equilibria at 1073 K, 1173 K, and 1273 K in the Fe-Cu portion of the Fe-Cu-Al system were determined by a diffusion couple technique, metallography, and transmission electron microscopy (TEM). It is shown that there is a miscibility gap of the bcc phase which is divided into A2 + A2, A2 + B2 and B2 + B2 two-phase regions. Based on the experimental data of phase equilibria of the present as well as of previous studies, a thermodynamic assessment of phase equilibria was made, in which the order-disorder transition of the bcc phase is taken into account. The thermodynamic parameters of fcc, bcc, and liquid phases were evaluated to describe the Gibbs energy of each phase leading to a better fit between calculations and experimental findings above 1073 K.

Original languageEnglish
Pages (from-to)828-835
Number of pages8
JournalInternational Journal of Materials Research
Issue number12
Publication statusPublished - 1998 Dec


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