Free volume gradient effect on mechanical properties of metallic glasses

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• 作者：Yongwei Wang^a ; ^c ; Mo Li^b ; ^c ; ^{mo.li@gatech.edu} ; Jinwu Xu^a
• 关键词：Metallic glass composite ; Free volume theory ; Plasticity ; Shear band ; Spatial distribution ; Statistical distribution
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：12-16
• 全文大小：884 K
• 卷排序：130

文摘

Gradient of free volume distribution in metallic glasses is omnipresent either naturally or artificially in synthesis and application. But how the spatial inhomogeneity affects mechanical properties remains poorly understood. Here we probe this issue using finite element modeling. We find that the strength and toughness improves with increasing gradient; and the larger the gradient, the more effective. But the plasticity is marginally enhanced or even decreases. Too high the gradient value leads to brittle fracture caused by abrupt release of the large stress concentrated at the gradient region. The effects are represented in their relations with the gradient energy coefficient.