Softening and heating behaviors during the nonlinear viscous flow in a Zr-based bulk metallic glass

Hidemi Kato, Akihisa Inoue, H. S. Chen

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Heat evolution of stress-induced structural disorder ΔHs(ε) of a Zr55Al10Ni5Cu30 bulk metallic glass (BMG) during compressive constant ram-velocity deformation in the glass transition region (Tg = 680 K) was deduced from in situ measurements of temperature change ΔT(ε) of deforming samples, where ε is true strain. At transition from the linear to nonlinear viscoelasticity, i.e., a softening phenomenon, viscosity η(ε) does not change consistently with ΔT(ε) but with ΔHs(ε). Therefore, it is concluded that the stress-induced structural disorder triggered this softening phenomenon. The viscous frictional heating of the softened alloy brings about the increase in ΔT, which also influences ΔHs. Because ΔT is determined by relationship between the power of the frictional heating and heat convection to the sample-surroundings, ΔHs and η can be positively controlled with varying thermal conductivity D of the surrounding materials, especially after the transition period.

本文言語English
ページ(範囲)3764-3768
ページ数5
ジャーナルJournal of Non-Crystalline Solids
353
32-40
DOI
出版ステータスPublished - 2007 10 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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