Coherent cluster ordering in Fe-xAl and Fe-xGa alloysстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 декабря 2021 г.
Аннотация:The evolution of structural phases and the morphology of the microstructure of several Fe-xAl and Fe-xGa compositions were studied by neutron diffraction with high Δd/d resolution and with high-intensity continuous scanning in a wide temperature range. It was found that the formation of an ordered structure upon a change in the Al or Ga content or during a phase transition upon a change in temperature leads to a decrease in the unit-cell parameter with a “jump” of the order of Δa/a ~ 0.001. A specific microstructure in the form of mesoscopic clusters (L ~ 200–1000 Å) with an ordered atomic structure dispersedly incorporated into a disordered or less ordered matrix can be formed in the ranges of 23 at% < x < 33 at% for Fe-xAl and 19 at% < x < 24 at% for Fe-xGa. Independent determination of the unit-cell parameters of the matrix and clusters showed their coherence, which is manifested in their coincidence or proximity with a high degree of accuracy (Δa/a ≤ 0.0001). This type of phase separation (matrix + clusters) has a completely different nature with an incoherent phase coexisting in the outer or thin layers, which leads to lattice parameters difference at the level of Δa/a ~ 0.001.