Zhang L, Jin ZH, Zhang LH, Sui ML, Lu K
State Key Laboratory of Rapidly Solidified Non-equilibrium Alloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China.
Phys Rev Lett. 2000 Aug 14;85(7):1484-7. doi: 10.1103/PhysRevLett.85.1484.
In this work we report, for the first time, an experimental observation of a superheating phenomenon in metal thin films. By means of cold rolling, Pb thin films of about 20 nm thick were sandwiched by Al layers, and between them semicoherent epitaxial Pb/Al interfaces were formed. In situ x-ray diffraction analysis indicated that the confined Pb thin films could be superheated for at least 6 degrees C. Thermodynamic analysis indicated that such a substantial superheating in the confined two-dimensional thin films may originate from suppression of growth of the molten droplets by the epitaxial Al/Pb/Al confinement, instead of suppression of melt nucleation for the confined particle superheating.
在这项工作中，我们首次报告了在金属薄膜中过热现象的实验观察结果。通过冷轧，约20纳米厚的铅薄膜夹在铝层之间，并在它们之间形成了半共格外延Pb/Al界面。原位X射线衍射分析表明，受限的铅薄膜可以过热至少6摄氏度。热力学分析表明，在受限的二维薄膜中如此显著的过热可能源于外延Al/Pb/Al限制对熔滴生长的抑制，而不是对受限颗粒过热中熔体成核的抑制。
