A new hcp phase formed in the Ni-Nb system during ion-beam-assisted deposition

作者：Zhao B; Geng KW; Zeng F; Pan F^*

来源：Journal of Materials Science & Technology, 2004, 20(5): 577-579.

• Hcp phase
• Ni-Nb
• ion beam assisted deposition
• thermodynamics
• valence electron effect

The Ni80Nb20 films were prepared by ion beam assisted deposition (IBAD) with various Ar+ ion energies. A phase evolution of fcc-->amorphous-->Ni+Nb-->Ni+hcp was observed with the increasing of ion beam energy from 2 keV to 8 keV. When bombarded by Ar+ ions of 8 keV during deposition, a new crystalline phase with hcp structure was obtained, of which the lattice parameters are a = 0.286 nm and c = 0.483 nm, different from those of the similar A(3)B-type hcp phase previously reported. The experimental results were discussed in terms of thermodynamics and restricted kinetic conditions in the far-from-equilibrium process of IBAD. The formation of hcp phase may also be related to the valence electron effect.

• 出版日期2004-9
• 单位清华大学