Abstrac

t—Some comparative nanoindentation results were presented for the Ti₃AlC₂ MAX phase (nanolayered material), the (001) plane of a LiF single crystal (elastoplastic material), and the PTFE polymer (viscoelastoplastic material). Using quasi-static nanoindentation, the hardness and elastic modulus of specimens were determined, and significant elastic energy dissipation was revealed the for Ti₃AlC₂ MAX phase under cyclic loading (as typical for some other nanolayered materials, such as graphite and high-temperature superconductors). To determine the viscoelastic characteristics for the MAX phase, the indentation depth change was measured in 60 s after fast indenter unloading. The relaxation time was determined for the MAX phase for the first time. In addition, fast unloading also made it possible to separate the components (elastic, viscoelastic, and plastic) of strain upon nanocontact for these materials. Although the share of viscoelastic strain in the total strain upon contact was negligible (~0.1%) for LiF, it was much higher for the Ti₃AlC₂ MAX phase and the PTFE polymer and equal to ~1 and ~17%, respectively.

中文翻译：

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Ti 3 AlC 2 MAX相在室温下的蠕变和粘弹性

Abstrac

t-给出了Ti ₃ AlC ₂ MAX相（纳米层材料），LiF单晶的（001）平面（弹塑性材料）和PTFE聚合物（粘弹塑性材料）的一些比较纳米压痕结果。使用准静态纳米压痕，测定样品的硬度和弹性模量，并发现Ti ₃ AlC _2的显着弹性能量耗散。循环负载下的MAX相（对于某些其他纳米层材料，例如石墨和高温超导体，通常如此）。为了确定MAX相的粘弹性特性，在快速压头卸载后60 s内测量压痕深度变化。首次确定了MAX阶段的弛豫时间。另外，对于这些材料，快速卸载还使得在纳米接触时分离应变的成分（弹性，粘弹性和塑料）成为可能。尽管对于LiF，粘弹性应变在总应变中的份额可忽略不计（〜0.1％），但对于Ti ₃ AlC ₂ MAX相和PTFE聚合物，则要高得多，分别等于〜1％和〜17％。