Abstract
AbstractRejuvenation is the structural excitation of glassy materials, and is a promising approach for improving the macroscopic deformability of metallic glasses. This atomistic study proposes the application of compressive hydrostatic pressure during the glass-forming quenching process and demonstrates highly rejuvenated glass states that have not been attainable without the application of pressure. Surprisingly, the pressure-promoted rejuvenation process increases the characteristic short- and medium-range order, even though it leads to a higher-energy glassy state. This ‘local order’–‘energy’ relation is completely opposite to conventional thinking regarding the relation, suggesting the presence of a well-ordered high-pressure glass/high-energy glass phase. We also demonstrate that the rejuvenated glass made by the pressure-promoted rejuvenation exhibits greater plastic performance than as-quenched glass, and greater strength and stiffness than glass made without the application of pressure. It is thus possible to tune the mechanical properties of glass using the pressure-promoted rejuvenation technique.
Highlights
Rejuvenation is the opposite phenomena to ageing, and it has been investigated for decades in relation to molecular and polymeric glasses,[1] and more recently in relation to metallic glasses (MGs).[2,3,4,5,6,7,8] In contrast to rejuvenation, ageing is a structural relaxation of the glassy material that changes both the internal structure and mechanical properties of the glass
To overcome the practical drawbacks, we propose a pressure-promoted thermal rejuvenation technique here, in which pressure is applied during the glass-forming quenching process
We found that pressure-promoted rejuvenation is achieved only when a comprehensive influence of three pressure effects on glass-forming process, i.e., effects of temperature-dependent liquid inherent structure energy, pressure-dependent diffusively slowdown and Tg increase, gains ascendancy over an increase in the Arrhenius–non-Arrhenius diffusivity transition temperature
Summary
Rejuvenation is the opposite phenomena to ageing, and it has been investigated for decades in relation to molecular and polymeric glasses,[1] and more recently in relation to metallic glasses (MGs).[2,3,4,5,6,7,8] In contrast to rejuvenation, ageing is a structural relaxation of the glassy material that changes both the internal structure and mechanical properties of the glass. Prediction of pressure-promoted thermal rejuvenation map We constructed MG models via a melt-quenching process (A → D in Figure 1a) as follows.
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