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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Relating metallic glass mechanical properties to liquid structure
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Relating metallic glass mechanical properties to liquid structure

机译：将金属玻璃的机械性能与液体结构联系起来

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Molecular dynamics simulations indicate that the mechanical properties of a model metallic glass depend critically on the degree of supercooling attained in the liquid prior to vitrification. A well-characterized binary glass-forming system roughly analogous to ZrTi was quenched instantaneously from a series of liquid temperatures. These temperatures ranged from approximately twice that of the onset of supercooled liquid behaviour down to just above the mode-coupling temperature (T_(MCT)). The low-temperature mechanical properties of these glass samples is studied in simple shear at constant strain rate while the density of the system is held constant. All the glasses exhibit an initial linear response at small strain and approached a steady-state flow regime at large strain. However, glasses obtained by quenching from supercooled liquids just above T_(MCT), which we will refer to as T_(MCT) glasses, exhibit higher shear strength and modulus than glasses obtained by quenching from higher temperature liquids. The T_(MCT) glasses also exhibit pronounced shear softening. The change in pressure during shear is markedly different in these glasses, and indicates that the T_(MCT) glasses retain aspects of the quenched-in structure out to as much as 25% strain. The changes in pressure also indicate significant structural changes occur even during nearly linear stress-strain response.
机译：分子动力学模拟表明，模型金属玻璃的机械性能主要取决于玻璃化之前液体中的过冷度。从一系列液体温度下，立即淬灭了一个与ZrTi大致相似的，特性良好的二元玻璃成型系统。这些温度的范围大约是过冷液体行为开始温度的两倍，再到刚好高于模式耦合温度（T_（MCT））。在系统密度保持恒定的情况下，以恒定的应变速率在简单剪切下研究了这些玻璃样品的低温机械性能。所有的玻璃在小应变时都表现出初始线性响应，在大应变时达到稳态流态。然而，从刚好高于T_（MCT）的过冷液体淬火获得的玻璃（我们称为T_（MCT）玻璃）比通过高温液体淬火获得的玻璃具有更高的剪切强度和模量。 T_（MCT）玻璃还表现出明显的剪切软化。这些玻璃在剪切过程中的压力变化显着不同，这表明T_（MCT）玻璃将淬火结构的各个方面保持高达25％的应变。压力的变化也表明，即使在几乎线性的应力应变响应期间，也会发生重大的结构变化。

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