Isochemical control over structural state and mechanical properties in Pd-based metallic glass by sputter deposition at elevated temperatures
Authors: Magagnosc, DJ; Feng, G; Yu, L; Cheng, XM; Gianola, DS
APL MATERIALS, 4 (8)
Abstract:
Sputter deposition, while varying the substrate temperature, is employed to isochemically control the structural state and concomitant mechanical response in a Pd-based metallic glass at the time of glass formation. Increasing the deposition temperature from 333 K to 461 K results in a 33.5% increase in hardness to 9.69 GPa for amorphous films. Further increasing the temperature leads to a decrease in hardness, indicating low and high temperature deposition regimes where increased surface mobility allows access to a more relaxed and more rejuvenated structure, respectively. Through this mechanism we access the range of achievable structural states, from ultrastable to highly liquid-like glasses. (C) 2016 Author(s).