A nanoindentation study of the viscoplastic behavior of pure lithium

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• 作者：Yikai Wang ; ^{ywa286@g.uky.edu} ; Yang-Tse Cheng
• 关键词：Lithium ; Nanoindentation ; Plasticity ; Finite element analysis
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：191-195
• 全文大小：953 K
• 卷排序：130

文摘

Applying mechanical stresses is a possible approach to suppress dendrite and mossy lithium (Li) in Li metal electrodes. We conducted, in this work, nanoindentation tests on pure Li metal in an argon-filled glove box to study its viscoplastic behavior at room temperature. Both load-controlled and strain rate-controlled nanoindentations showed clear viscoplastic characteristics of Li. Based on an iterative finite element (FE) modeling approach, we determined a viscoplastic constitutive law for Li. In addition, we demonstrated by FE modeling that elastic modulus, on the order of GPas, has a negligible influence on the nanoindentation response of Li at ambient temperature.