Intrinsic size effects in the mechanical response of taper-free nanopillars of metallic glass
Intrinsic size effects in the mechanical response of taper-free nanopillars of metallic glass
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DOI：
10.1103/physrevb.83.180201
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发表时间：
2011-05-04
影响因子：
3.7
通讯作者：
De Hosson, Jeff Th M.
中科院分区：
文献类型：
--
作者：
Chen, Chang Qiang;Pei, Yu Tao;De Hosson, Jeff Th M.
定量的应力-应变曲线和原位透射电子显微镜观察表明，本质上强大的样品尺寸的影响，锥形的无金属玻璃柱的变形模式。随着柱直径从640 nm逐渐减小到70 nm，变形模式从（i）高度局部化和灾难性的剪切带演变为（ii）最初的非局部化变形向伴随软化的走走停停剪切带发展，（iii）明显均匀和无带变形，但具有间歇性剪切事件，最终（iv）完全均匀和平滑的塑性流动。
Both quantitative stress-strain curves and in situ transmission electron microscope observations demonstrate intrinsically strong sample size effects on the deformation mode of taper-free metallic glass pillars. With the pillar diameter gradually decreasing from 640 to 70 nm, the deformation mode evolves from (i) highly localized and catastrophic shear banding to, (ii) initially nonlocalized deformation developing toward stop-and-go shear banding accompanied by softening, (iii) apparently homogeneous and banding-less deformation but with intermittent shear events, and eventually (iv) fully homogeneous and smooth plastic flow.