Compressive creep behavior of cast Bi2Te3

Compressive creep behavior of cast Bi2Te3
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铸造 Bi2Te3 的压缩蠕变行为

DOI:
10.1016/j.msea.2012.12.052
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发表时间:
2013-03
影响因子:
6.4
通讯作者:
David Dun
David Dun
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhiping Guan;Zhiping Guan;David Dun;David Dun

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在热电器件中,bi2te3必须能够在高温梯度下工作很长时间(数年)而不会出现明显的变形,同时承受由内部热失配和外力(例如振动)产生的应力。在温度为400 ~ 500℃的单轴压应力范围为2 ~ 16MPa的条件下,测量了铸态粗晶bi2te3的变形速率。在所有温度下,观察到幂律行为,应力指数n= 3-6,活化能为~ 145kJ/mol。在重复实验中观察到蠕变速率的显著差异,这可能是由于粗粒试样的各向异性蠕变阻力。bi2te3在400°C和450°C时呈脆性,但在500°C时表现出一定的抗压延展性,这表明热锻是可能的。
In thermoelectric devices, Bi2Te3must be able to operate under high temperature gradients for very long times (years) without appreciable deformation, while being subjected to stresses created by internal thermal mismatch and external forces (e.g., vibrations). The deformation rate of cast, coarse-grained Bi2Te3was measured under uniaxial compressive stresses from 2 to 16MPa at temperatures between 400 and 500°C. At all temperatures, a power-law behavior is observed, with a stress exponent n=3–6 and an activation energy of ∼145kJ/mol. Significant differences in creep rates are observed in duplicate experiments, which may be due to anisotropic creep resistance in coarse-grained specimens. Bi2Te3is brittle at 400 and 450°C but shows some compressive ductility at 500°C, indicating that hot forging may be possible.
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影响因子: 0.8
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