Extreme rejuvenation and softening in a bulk metallic glass.

Extreme rejuvenation and softening in a bulk metallic glass.
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大块金属玻璃的极度再生和软化

DOI:
10.1038/s41467-018-02943-4
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发表时间:
2018-02-08
影响因子:
16.6
通讯作者:
Li Y
Li Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pan J;Wang YX;Guo Q;Zhang D;Greer AL;Li Y

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使金属玻璃回复到更高的能量状态,对改善其塑性是有意义的。人们对返老还童的机制知之甚少,其局限性也尚未探索。我们在压缩中使用约束加载来在锆基块体金属玻璃上施加大量的塑性流动。最大的测量效果是,玻璃的硬度降低了36%,其过剩焓(以上的松弛状态)增加到41%的熔化焓。只有在微观尺度上,在剪切带中心的低体积分数的比较高程度的复兴已被报道。这种极端复兴的散装玻璃给出了一个状态相当于通过淬火液体在~ 10 - 10 K s-1,许多数量级的速度比散装标本是可能的。与早期的结果显示松弛在类似的测试下拉伸强调静水应力的重要性。
Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreases by 36%, and its excess enthalpy (above the relaxed state) increases to 41% of the enthalpy of melting. Comparably high degrees of rejuvenation have been reported only on microscopic scales at the centre of shear bands confined to low volume fractions. This extreme rejuvenation of a bulk glass gives a state equivalent to that obtainable by quenching the liquid at~ 10 10 K s–1, many orders of magnitude faster than is possible for bulk specimens. The contrast with earlier results showing relaxation in similar tests under tension emphasizes the importance of hydrostatic stress.
DOI: 10.1016/s0022-5096(01)00115-6
发表时间: 2002-05-01
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