Shear stress induced reduction of glass transition temperature in a bulk metallic glass

Shear stress induced reduction of glass transition temperature in a bulk metallic glass
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剪切应力导致块体金属玻璃的玻璃化转变温度降低

DOI:
10.1016/j.actamat.2005.03.015
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发表时间:
2005-06
期刊:
影响因子:
9.4
通讯作者:
--
中科院分区:
材料科学1区
文献类型:
--
作者:

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与先前观察到的玻璃化转变温度(Tg)在静水压力下略有增加相反,我们首次报告了Tg的急剧降低(40 K/500 MPa)剪切应力作用下的Zr46.75Ti8.25Cu7.5Ni10.0Be27.5大块非晶合金,这引起了在施加压缩应力时流动温度急剧下降的实验观察。T的显著降低归因于在剪切应力(126 Ω 3)下有较大的弛豫激活体积ΔVτ,并可用自由体积模型进行定量解释。
In contrast to previous observations of a slight increase in glass transition temperature (Tg) under hydrostatic pressure, we report, for the first time, a drastic reduction of Tg(40K/500MPa) induced by shear stress in a Zr46.75Ti8.25Cu7.5Ni10.0Be27.5bulk metallic glass, which gives rise to the experimental observation of the drastic decrease in flow temperature while a compressive stress was applied. The significant Tgreduction is attributed to a large activation volume of relaxation ΔVτunder shear stress (126Å3), and can be quantitatively interpreted in terms of the free volume model.
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