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首页> 外文期刊>Philosophical Magazine Letters >Size-dependent plasticity in micron- and submicron-sized ionic crystals
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Size-dependent plasticity in micron- and submicron-sized ionic crystals

机译:微米和亚微米级离子晶体的尺寸依赖性可塑性

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Uniaxial microcompression methodology is applied to study the mechanical behaviour of (1 00)-oriented NaCl, KC1, LiF and MgO single-crystal pillars ranging from 250 nm to 4um in diameter. As in metallic materials a strong size effect with regard to compressive strength is observed, NaCl, KCl, LiF and MgO pillars exhibit scaling exponents of -0.64 ±0.02, -0.72 ±0.02, —0.68 ±0.02 and —0.8 ±0.03, respectively. These compare well to face centered cubic (fcc) metals, but the normalized stress levels of LiF and MgO are higher than those of NaCl, KCl and fcc metals. The differences in strength levels are interpreted in terms of susceptibility to ion-induced damage, which is intrinsic to the fabrication process. In addition, the strong size-dependent plasticity of (1 0 0)-oriented ionic crystals can be correlated with their lower critical temperatures.
机译:单轴微压缩方法用于研究(1 00)取向的NaCl,KCl,LiF和MgO单晶柱的力学行为,直径范围从250 nm到4um。与在金属材料中一样,观察到关于抗压强度的强烈尺寸效应,NaCl,KCl,LiF和MgO柱分别显示出-0.64±0.02,-0.72±0.02,-0.68±0.02和-0.8±0.03的缩放指数。这些与面心立方(fcc)金属比较好,但LiF和MgO的归一化应力水平高于NaCl,KCl和fcc金属。强度水平的差异是根据对离子诱导损伤的敏感性来解释的,这是制造过程所固有的。此外,(1 0 0)取向的离子晶体具有很强的尺寸依赖性,其可塑性与其较低的临界温度有关。

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