Characterization of Nanoscale Mechanical Heterogeneity in a Metallic Glass by Dynamic Force Microscopy
Characterization of Nanoscale Mechanical Heterogeneity in a Metallic Glass by Dynamic Force Microscopy
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DOI：
10.1103/physrevlett.106.125504
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发表时间：
2011-03-23
影响因子：
8.6
通讯作者：
Chen, M. W.
中科院分区：
文献类型：
--
作者：
Liu, Y. H.;Wang, D.;Chen, M. W.
我们报告的动态力显微镜表征的金属玻璃的纳米级力学异质性。观察到表观能量耗散的变化类似于12%，源于局部粘弹性的不均匀分布。测量的相关长度的异质性是类似于2.5 nm，与塑性流动的剪切转化区的尺寸一致。该研究首次提供了金属玻璃纳米尺度粘弹性非均匀性的实验证据，并可能填补原子模型与宏观玻璃性质之间的差距。
We report nanoscale mechanical heterogeneity of a metallic glass characterized by dynamic force microscopy. Apparent energy dissipation with a variation of similar to 12%, originating from nonuniform distribution of local viscoelasticity, was observed. The correlation length of the heterogeneity was measured to be similar to 2.5 nm, consistent with the dimension of shear transformation zones for plastic flow. This study provides the first experimental evidence on the nanoscale viscoelastic heterogeneity in metallic glasses and may fill the gap between atomic models and macroscopic glass properties.