Structure and dynamics of shear bands in amorphous-crystalline nanolaminates

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• 作者：Wei Guo^a ; ^c ; ^{wguo2007@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Bin Gan^b ; Jon M. Molina-Aldareguia^b ; Jonathan D. Poplawsky^c ; Dierk Raabe^a
• 关键词：Nanolaminates ; Metallic glass ; Nanocrystallization ; Shear band ; Atom probe tomography
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：110
• 期：Complete
• 页码：28-32
• 全文大小：1825 K

文摘

The velocities of shear bands in amorphous CuZr/crystalline Cu nanolaminates were quantified as a function of strain rate and crystalline volume fraction. A rate-dependent transition in flow response was found in a 100 nm CuZr/10 nm Cu nanolaminates. When increasing the Cu layer thickness from 10 nm to 100 nm, the instantaneous velocity of the shear band in these nanolaminates decreases from 11.2 渭m/s to <∼500 nm/s. Atom probe tomography and transmission election microcopy observation revealed that in post-deformed pillars both grain rotation in the crystalline portion and non-diffusive crystallization in the amorphous layer affect the viscosity of shear bands.