Elevated and cryogenic temperature micropillar compression of magnesium–niobium multilayer films

Elevated and cryogenic temperature micropillar compression of magnesium–niobium multilayer films
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镁铌多层薄膜的高温和低温微柱压缩

DOI:
10.1007/s10853-019-03422-x
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发表时间:
2019
影响因子:
4.5
通讯作者:
Michler, J
Michler, J
中科院分区:
材料科学3区
文献类型:
--
作者:
Thomas, K;Mohanty, G;Wehrs, J;Taylor, AA;Pathak, S;Casari, D;Schwiedrzik, J;Mara, N;Spolenak, R;Michler, J

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通过在广泛的温度范围内进行微柱压缩实验,研究了由镁和铌交替层组成的多层薄膜的机械性能。从变温微柱压缩测试和应变率跳跃测试中收集的数据用于深入了解材料内的操作变形机制。在较高温度下,基于扩散的变形机制可确定多层膜的塑性行为。沿着镁-铌界面比在本体内部更容易发生扩散,充当镁扩散的途径。当单层厚度足够小时,扩散在直至室温下仍然是主要的变形机制。多层强化模型历来仅依赖于基于位错的论证;因此,考虑具有低熔化温度成分的纳米层压材料中基于扩散的变形可以更好地理解多层行为。
The mechanical properties of multilayer films consisting of alternating layers of magnesium and niobium are investigated through micropillar compression experiments across a broad range of temperatures. The data collected from the variable temperature micropillar compression tests and strain rate jump tests are used to gain insight into the operative deformation mechanisms within the material. At higher temperatures, diffusion-based deformation mechanisms are shown to determine the plastic behavior of the multilayers. Diffusion occurs more readily along the magnesium–niobium interface than within the bulk, acting as pathway for magnesium diffusion. When individual layer thicknesses are sufficiently small, diffusion can remain the dominant deformation mechanism down to room temperature. Multilayer strengthening models historically rely solely on dislocation-based arguments; therefore, consideration of diffusion-based deformation in nanolaminates with low melting temperature components offers improved understanding of multilayer behavior.
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