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Anisotropy in the mechanical properties of organic crystals: temperature dependence

机译:有机晶体力学性能的各向异性:温度依赖性

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The nanoindentation technique has recently been utilized for quantitative evaluation of the mechanical properties of molecular materials successfully, including their temperature (T) dependence. In this paper, we examine how the mechanical anisotropy varies with T in saccharin and L-alanine single crystals. Our results show that elastic modulus (E) decreases linearly in all the cases examined, with the T-dependence of E being anisotropic. Correspondence between directional dependence of the slopes of the E vs. T plots and the linear thermal expansion coefficients was found. The T-dependence of hardness (H), on the other hand, was found to be nonlinear and significant when (100) of saccharin and (001) of L-alanine are indented. While the anisotropies in E and H of saccharin and E of L-alanine enhance with T, the anisotropy in H of L-alanine was found to reduce with T. Possible mechanistic origins of these variations are discussed.
机译:纳米压痕技术最近已被成功地用于定量评估分子材料的机械性能,包括它们对温度(T)的依赖性。在本文中,我们研究了糖精和L-丙氨酸单晶中机械各向异性如何随T的变化而变化。我们的结果表明,在所有检查的情况下,弹性模量(E)均呈线性下降,而E的T依赖性是各向异性的。 E与T曲线的斜率的方向相关性与线性热膨胀系数之间存在对应关系。另一方面,硬度(H)的T依赖性是非线性的,并且当糖精(100)和L-丙氨酸的(001)缩进时是显着的。虽然糖精的E和H的各向异性以及L-丙氨酸的E的各向异性随T增强,但L的丙氨酸的H的各向异性却随T降低。讨论了这些变化的可能机理。

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