The temperature and time dependencies of viscosity of the liquid alloys, Al87Ni8Y5, Al86Ni8La6, Al86Ni8Ce6, and the binary Al-Ni and Al-Y melts with Al concentration over 90 at.% have been studied. Non-monotonic relaxation processes caused by destruction of nonequilibrium state inherited from the basic-heterogeneous alloy have been found to take place in Al-Y, Al-Ni-REM melts after the phase solid-liquid transition. The mechanism of nonmonotonic relaxation in non-equilibrium melts has been suggested.
Mode Localization and Suppressed Heat Transport in Amorphous Alloys
玻璃通常代表固体热导率的下限,但对非晶材料中晶格热传输的基本理解可以提供超越这种限制的设计规则。在这里,我们调查的质量无序在玻璃中的作用,通过研究非晶硅锗合金(a-Si $_{1-x}$ Ge $_x$)在整个范围内的原子浓度从$x=0$到$x=1$,使用分子动力学和准谐波Green-Kubo晶格动力学形式主义。我们发现,a-Si $_{1-x}$ Ge $_x$的热导率作为$x$的函数表现出比在晶体质量无序合金中更平滑的U形。在低Ge浓度下,对热导率初始下降的主要贡献源于其他扩展模式的局部化,这些模式构成了频率最低的8%的群体。从中频模式的贡献逐渐减少,随着Ge的增加,以达到一个广泛的最小热导率之间的Ge浓度从$x=0.25$到$0.75$。
Constructing material network representations for intelligent amorphous alloys design
Songshan Lake Materials Laboratory, Dongguan, China(松山湖材料实验室,东莞,中国);Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA(劳伦斯伯克利国家实验室,伯克利 CA 94720,美国);Institute of Physics, Chinese Academy of Sciences, Beijing, China(物理研究所,中国科学院,北京,中国)
Pressure-induced s,p-d electron redistribution accompanies structural transformation in amorphous Zr-Cu alloy under compression
Warsaw University of Technology(华沙理工大学);Cranfield University(克兰菲尔德大学);The University of Bristol(布里斯托大学);Diamond Light Source(钻石光源);University of Edinburgh(爱丁堡大学);Ehime University(爱媛大学)
Possible origin of $β$-relaxation in amorphous metal alloys from atomic-mass differences of the constituents
我们采用原子尺度的非仿射晶格动力学的框架内的理论,揭示了金属玻璃(MG)的Johari-Goldstein(JG)$β$ -弛豫的起源。结合模拟和实验数据与我们的理论方法,我们揭示了大的质量不对称的元素之间的La $_{60}$ Ni $_{15}$ Al $_{25}$ MG导致一个明确的分离,在各自的弛豫时间尺度,给出了强有力的证据,JG弛豫控制的最轻的原子物种存在。此外,我们表明,只有定性特征的振动态密度确定的整体观察到的玻璃的机械响应,铺平了道路,一个可能的统一理论的二次弛豫玻璃。
Hall coefficient in amorphous alloys: critical behavior and quantitative test of quantum corrections due to weak localization and electron-electron interactions