Formation of non-equilibrium solid phases in Fe-Nb multilayered films by ion irradiation
C Lin; J B Liu; G W Yang; B X Liu; C Lin; Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China; J B Liu; Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China; G W Yang; Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China; B X Liu; Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Журнал:
Journal of Physics: Condensed Matter
Дата:
1998-12-07
Аннотация:
In the Fe-Nb system, amorphous alloy, metastable crystalline fcc and hexagonal phases were formed in Nb-rich multilayered films by room temperature 200 keV xenon ion mixing. A heat of formation diagram of the system was constructed based on Miedema's model and Alonso's calculation method, and the diagram gave a relevant interpretation for the observed phase formation. The formation of fcc metastable phase can be interpreted by a reverse martensitic transition of bcc-fcc. The amorphous and hexagonal phases are thought to form through a traditional nucleation and growth mechanism with an additional consideration of the irradiation effect, which kinetically hindered the formation of a complicated intermediate compound.
230.3Кб