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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Dependence of the atomic dynamics of metallic glasses on quenched-in density fluctuations and on temperature
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Dependence of the atomic dynamics of metallic glasses on quenched-in density fluctuations and on temperature

机译：金属玻璃的原子动力学对淬火密度波动和温度的依赖性

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Results from two different series of neutron inelastic scattering experiments are presented. In the first series the dependence of the atomic dynamics of a metallic glass. NiPdP, on rapid quenching hits been Studied. The quenched-in density fluctuations and especially the free volume lead to an increase of the low energy modes (LEMs) for energies between 2 and 20 meV for this glass. This intensity increases in the low energy region is however, not much more than was found for a rapidly quenched, i.e., highly defective fcc-Al lattice. The change of the calculated vibrational entropy due to these additional LEM is of the order of 3%. In search for anharmonic modes in metallic glasses, it second series of experiments investigated the dependence of the atomic dynamics on temperature using it conventional metal-metal glass, NiZr, and one of the more stable Zr-based glasses, ZrCuAl. Anharmonic effects in the form of a shift of the complete generalised vibrational density of states to lower energies on heating were in fact observed for the first time. However these effects can be attributed to the expansion of the glass, which for it metallic glass obviously proceeds by an increase of the atomic distances rather than by formation of additional free volume, or by anharmonic modes expected from the soft potential model. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 10]
机译：给出了两个不同系列的中子非弹性散射实验的结果。在第一个系列中，金属玻璃的原子动力学具有依赖性。研究了NiPdP对快速淬火的影响。淬火后的密度波动，尤其是自由体积，导致该玻璃的2至20 meV之间的能量的低能模式（LEM）增大。然而，该强度在低能量区域中的增加不多于快速淬火即高度缺陷的fcc-Al晶格所发现的强度。由于这些额外的LEM，计算出的振动熵的变化约为3％。为了寻找金属玻璃中的非调和模态，第二系列实验使用传统的金属-金属玻璃NiZr和一种更稳定的Zr基玻璃ZrCuAl研究了原子动力学对温度的依赖性。实际上，第一次观察到了以状态的完全广义振动密度向较低能量转变的非谐效应。但是，这些影响可以归因于玻璃的膨胀，对于金属玻璃而言，金属玻璃显然是通过增加原子距离而不是通过形成额外的自由体积或通过软势模型预期的非谐模来进行的。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：10]

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