Decoupling of Component Diffusion in a Glass-Forming Zr46.75Ti8.25Cu7.5Ni10Be27.5 Melt Far above the Liquidus Temperature

被引：27

作者：

Basuki, Sri Wahyuni ^{[1
]}

Bartsch, Alexander ^{[1
]}

Yang, Fan ^{[2
]}

Raetzke, Klaus ^{[1
]}

Meyer, Andreas ^{[2
]}

Faupel, Franz ^{[1
]}

机构：

[1] Univ Kiel, Tech Fak, Inst Mat Wissensch, Lehrstuhl Materialverbunde, D-24143 Kiel, Germany

[2] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 16期

关键词：

BULK METALLIC GLASSES; SELF-DIFFUSION; DEPENDENCE; TRANSITION; DYNAMICS; VOLUME; TIME;

D O I：

10.1103/PhysRevLett.113.165901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report Zr-95 and Co-57 radiotracer diffusivities and viscosity data in the equilibrium liquid state of a bulk metallic glass forming Zr46.75Ti8.25Cu7.5Ni10Be27.5 melt (Vitreloy 4) far above the liquidus temperature T-l that are not affected by convection, as evidenced via quasielastic neutron scattering. Zr diffusion is strongly decoupled from diffusion of the smaller components by more than a factor of 4 at T-l, although it obeys the Stokes-Einstein equation. The results suggest that, in the present Zr-based metallic glass forming systems, diffusion and viscous flow start to develop solidlike, i.e., energy-landscape-controlled, features already in the stable liquid state more than 300 K above the mode coupling temperature T-c.

引用

页数：5

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