Abnormal alloying behaviour observed in an immiscible Zr-Nb system

作者：Wang T L; Liang S H; Li J H; Tai K P; Liu B X^*

来源：Journal of Physics D: Applied Physics , 2008, 41(9): 095310.

DOI：10.1088/0022-3727/41/9/095310

For the immiscible Zr-Nb system characterized by a positive heat of formation (+ 6 kJ mol(-1)), thermodynamic calculation showed that the Gibbs free energy of the properly designed Zr-Nb multilayered films could be elevated to a higher level than that of the corresponding amorphous phase as well as the supersaturated solid solutions. Accordingly, nano-sized Zr-Nb multilayered films were prepared and then irradiated by 200 keV xenon ions. It was found that amorphous phases could be obtained within a composition range 12-92 at% of Nb. Also, two metastable crystalline phases of fcc structures with different lattice parameters were also obtained. Molecular dynamic simulation was carried out, based on a proven realistic Zr-Nb potential, to reveal the atomistic mechanism of the solid-state crystal-to-amorphous transition. A brief discussion on the formation of the two metastable crystalline phases is presented.

• 出版日期2008-5-7
• 单位清华大学