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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 >Visco-elasticity and mechanical relaxation behavior in La-based metallic glasses
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Visco-elasticity and mechanical relaxation behavior in La-based metallic glasses

机译：洛基金属眼镜中的粘弹性和机械松弛行为

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Dynamic mechanical relaxation process is one of the important issues to understand mechanical/physical properties of metallic glasses. In the current research, dynamic mechanical relaxation behavior of La62Al14(Cu-5/ Ag-6(1/6))(20)(Ni1/2Co1/2)(4) and (La0.7Ce0.3)(65)Al10Co25 bulk metallic glasses were investigated by mechanical spectroscopy. Unlike the typical Zr- or Cu-based metallic glasses, (La0.7Ce0.3)(65)Al10Co25 metallic glass shows an evident beta relaxation process. On the other hand, La62Al14(Cu5/6Ag1/6)(20)(Ni1/2Co1/2)(4) metallic glass presents a "shoulder" relaxation process. Physical aging below the glass transition temperature Tg induces a decrease of the concentration of "defects", which corresponds to a reduction of the intensity of the beta relaxation. During aging process, the amplitude of beta relaxation (oE") decreases, while the relaxation time (tau beta) increases. In organic glasses, it was reported that the changes of In(tau beta) and In(oEmax) are linearly correlated with In(tau beta)=b-a In (oE"max), this correlation has also been found in metallic glass. This behavior is discussed in the framework of the asymmetric double well potential (ADWP) model, and U and o are used to characterize ADWP. It is suggested that during the aging process, the U/o ratio remains basically unchanged, which is close to the coefficient describing the linear correlation between In(tau beta) and In(oEmax) (U/oa).
机译：动态力学弛豫过程是理解金属玻璃力学/物理性能的重要问题之一。在本研究中，采用力学光谱法研究了La62Al14（Cu-5/Ag-6（1/6））（20）（Ni1/2Co1/2）（4）和（La0.7Ce0.3）（65）Al10Co25大块金属玻璃的动态力学弛豫行为。与典型的锆或铜基金属玻璃不同，（La0.7Ce0.3）（65）Al10Co25金属玻璃表现出明显的β-弛豫过程。另一方面，La62Al14（Cu5/6Ag1/6）（20）（Ni1/2Co1/2）（4）金属玻璃呈现“肩部”松弛过程。低于玻璃化转变温度Tg的物理老化导致“缺陷”浓度降低，这对应于β弛豫强度降低。在老化过程中，β弛豫（oE）的振幅降低，而弛豫时间（tau-beta）增加。在有机玻璃中，有报道称In（tau-beta）和In（oEmax）的变化与In（tau-beta）=b-a In（oE“max）呈线性相关，这种相关性也在金属玻璃中发现。在非对称双阱势（ADWP）模型的框架内讨论了这种行为，并用U和o来表征ADWP。结果表明，在老化过程中，U/o比基本保持不变，接近于描述In（tau-beta）和In（oEmax）（U/oa）之间线性相关的系数。

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