Thermodynamic Origins of Shear Band Formation and the Universal Scaling Law of Metallic Glass Strength

Y. H. Liu, C. T. Liu, W. H. Wang, A. Inoue, T. Sakurai, and M. W. Chen

Phys. Rev. Lett. 103, 065504 – Published 7 August 2009

Abstract

We report a universal scaling law, $τ_{y} = 3 R (T_{g} − RT) / V$ , that uncovers an inherent relationship of the yield strength $τ_{y}$ with the glass transition temperature $T_{g}$ and molar volume $V$ of metallic glasses. This equation is derived from fundamental thermodynamics and validated by various metallic glasses with well-defined yielding. The linearity between $τ_{y}$ and $T_{g}$ demonstrates the intrinsic correlation between yielding and glass-liquid transition, which contributes to the basic understanding of the strength and deformation of glassy alloys.

Received 18 May 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.065504

Authors & Affiliations

Y. H. Liu¹, C. T. Liu^2,3, W. H. Wang⁴, A. Inoue¹, T. Sakurai¹, and M. W. Chen^1,*

¹WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
²Department of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom Kowloon, Hong Kong
³Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

^*To whom correspondence should be addressed. mwchen@wpi-aimr.tohoku.ac.jp

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Vol. 103, Iss. 6 — 7 August 2009

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