Scholarlink

<p>Stress relaxation experiments on a Zr<sub>50</sub>Cu<sub>34</sub>Ag<sub>8</sub>Al<sub>8</sub> amorphous alloy reveal that its dynamic heterogeneity is captured by a Kohlrausch–Williams–Watts stretched exponential function, demonstrating a non-Gaussian, asymmetric relaxation spectrum. The analysis based on the generalized Maxwell model revealed that the relaxation process is accelerated at high temperatures, indicating that increasing temperature makes more deformation units and promotes the formation of “liquid-like” zones. <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\beta }_{\text{KWW}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>β</mi> <mtext>KWW</mtext> </msub> </math></EquationSource> </InlineEquation> exhibits a non-monotonous trend with temperature due to the combined effects of temperature and structural relaxation. Physical aging improves structural stability by shifting the activation energy distribution toward higher values for increasing aging times. This results in a system energetic state closer to equilibrium, lowering the overall energy level and suppressing the relaxation process. Notably, it is found that the dynamic heterogeneity does not decrease but instead increases with aging. These findings provide significant insights into the structural origins of the viscoelastic behavior of amorphous alloys.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Probing the Dynamic Heterogeneity of an Amorphous Alloy from the Perspective of Stress Relaxation

  • 期刊论文

  • 发表日期：

    2026年2月16日

查看全文
  • X. L. Ning,
  • Q. Hao,
  • L. T. Zhang,
  • Y. J. Wang,
  • E. Pineda,
  • E. S. Park,
  • J. C. Qiao

摘要

Stress relaxation experiments on a Zr50Cu34Ag8Al8 amorphous alloy reveal that its dynamic heterogeneity is captured by a Kohlrausch–Williams–Watts stretched exponential function, demonstrating a non-Gaussian, asymmetric relaxation spectrum. The analysis based on the generalized Maxwell model revealed that the relaxation process is accelerated at high temperatures, indicating that increasing temperature makes more deformation units and promotes the formation of “liquid-like” zones. \({\beta }_{\text{KWW}}\) β KWW exhibits a non-monotonous trend with temperature due to the combined effects of temperature and structural relaxation. Physical aging improves structural stability by shifting the activation energy distribution toward higher values for increasing aging times. This results in a system energetic state closer to equilibrium, lowering the overall energy level and suppressing the relaxation process. Notably, it is found that the dynamic heterogeneity does not decrease but instead increases with aging. These findings provide significant insights into the structural origins of the viscoelastic behavior of amorphous alloys.