Deformation behavior of Al-rich metallic glasses under nanoindentation
Deformation behavior of Al-rich metallic glasses under nanoindentation
复制标题
纳米压痕下富铝金属玻璃的变形行为
DOI：
10.1016/j.jmst.2016.10.014
复制
发表时间：
2017-11-01
影响因子：
10.9
通讯作者：
Wang, Jianqiang
中科院分区：
文献类型：
--
作者：
Guo, Hui;Jiang, Chuanbin;Wang, Jianqiang
为了研究富铝非晶合金的变形行为，采用纳米压痕法对两种不同凝固过量体积的富铝非晶合金（块状和带状）进行了分析。结果表明，随着冻入过量体积的减小，锯齿状变形现象逐渐消失，硬度逐渐增加。此外，剪切转换区（STZs），有关的剪切带的发生，已被评估通过不同的方法：合作剪切模型（CSM），率跳跃法（RJM）和动态力学响应（DMR）。与此相反，由RJM计算的STZ体积从体相的2.77 nm（3）增加到带相的3.59 nm（3），这与富Al MG中二十面体超团簇中程有序结构模型得到的2.60 nm（3）吻合得很好。这一结果反映了STZ的形成与中程有序（MRO）之间存在内在的相关性。此外，根据冻结过量体积含量分析了STZ体积的变化趋势。(C)2017由Elsevier Ltd代表Journal of Materials Science & Technology编辑部出版。
To clarify the deformation behavior of Al-rich metallic glasses (MGs), two kinds of Al-rich MGs (i.e. bulk and ribbon samples) with different frozen-in excess volume have been analyzed under nanoindentation. It was found that, with the decrease of frozen-in excess volume, the serration behavior becomes inconspicuous together with the increase of hardness. Further, shear transformation zones (STZs), related to the occurrence of shear banding, have been evaluated by different methods: the cooperative shearing model (CSM), the rate-jump method (RJM) and the dynamic-mechanical response (DMR). In contrast, the STZ volumes, calculated by the RJM, increase from 2.77 nm(3) in the bulk to 3.59 nm(3) in the ribbon, which are in good agreement with 2.60 nm(3) obtained from the icosahedral supercluster medium-range order structure model in Al-rich MGs. This result reflects that an intrinsic correlation exists between the formation of STZs and the medium-range orders (MROs). Moreover, the variation trend of the STZ volume was analyzed in terms of the frozen-in excess volume content. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.