Heating and structural disordering effects of the nonlinear viscous flow in a Zr55Al10Ni5Cu30 bulk metallic glass

Hidemi Kato, Akihisa Inoue, H. S. Chen

研究成果: Conference article査読


Heat evolution of stress-induced structural disorder, ΔH s(ε), of a Zr55Al10Ni5Cu 30 bulk metallic glass (BMG) during constant ram-velocity deformation at the glass transition region (Tg= 680 K) was deduced from in-situ measurements of temperature change of the deforming sample. At the transition from the linear to nonlinear viscoelasticity, the behavior of viscosity change with strain, η(ε), is qualitatively consistent with the enthalpy evolution of the structural disordering, ΔHs(ε), but not with the temperature change, ΔT(ε). It is concluded that the initial softening deformation is due to the stress-induced structural disordering. The change in the nonlinearity, -logη̃ -logη/ηN, is found to be proportional to the ΔHs and the slope of ΔHs(-logη̃) can be estimated to ∼ 400 J/mol, where ηN is the Newtonian viscosity. On the other hand, the temperature raise, ΔT(ε), is pronouncedly delayed as compared with the η(ε) and ΔHs(ε) at the transition, but is determined by the product of stress and plastic strain-rate, σ· ε̇p, and is nearly proportional to it at the steady-state. The slope of ΔT(σ· ε̇p) can be estimated to 5.2×10-2 K mol/W.

ジャーナルMaterials Research Society Symposium - Proceedings
出版ステータスPublished - 2003
イベントAmorphous and Nanocrystalline Metals - Boston, MA., United States
継続期間: 2003 12 12003 12 4

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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