The European Physical Journal B ( IF 1.6 ) Pub Date : 2021-07-26 , DOI: 10.1140/epjb/s10051-021-00160-5 Karina E. Avila 1 , Vardan Hoviki Vardanyan 1 , Herbert M. Urbassek 1
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Abstract
Cutting of metallic glasses produces as a rule serrated and segmented chips in experiments, while atomistic simulations produce straight unserrated chips. We demonstrate here that with increasing depth of cut – with all other parameters unchanged – chip serration starts to affect the morphology of the chip also in molecular dynamics simulations. The underlying reason is the shear localization in shear bands. As the distance between shear bands increases with increasing depth of cut, the surface morphology of the chip becomes increasingly segmented. The parallel shear bands that formed during cutting do no longer interact with each other when their separation is \(\gtrsim \)10 nm. Our results are analogous to the so-called fold instability that has been found when machining nanocrystalline metals.
Graphic abstract
中文翻译：
金属玻璃模拟切割中的切屑锯齿过渡
摘要
在实验中，金属玻璃的切割通常会产生锯齿状和分段的切屑，而原子模拟会产生直的无锯齿状切屑。我们在此证明，在所有其他参数不变的情况下，随着切削深度的增加，切屑锯齿也开始影响分子动力学模拟中的切屑形态。根本原因是剪切带中的剪切局部化。随着剪切带之间的距离随着切削深度的增加而增加，切屑的表面形态变得越来越分段。在切割过程中形成的平行剪切带在它们的间隔为\(\gtrsim \) 10 nm时不再相互作用。我们的结果类似于在加工纳米晶金属时发现的所谓的折叠不稳定性。
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