Effect of structural relaxation on plastic flow in a Ni-Nb metallic glassy film

被引：35
作者：
Ma, Y. [1 ,2 ]
Cao, Q. P. [1 ,2 ]
Qu, S. X. [1 ,2 ,3 ]
Wang, X. D. [1 ,2 ]
Jiang, J. Z. [1 ,2 ]
机构：
[1] Zhejiang Univ, Int Ctr New Struct Mat, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, Dept Mat Sci & Engn, Lab New Struct Mat, Hangzhou 310027, Peoples R China
[3] Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Peoples R China
来源：
ACTA MATERIALIA | 2012年 / 60卷 / 08期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
Metallic glasses; Mechanical properties; Annealing; Shear band; Non-localized deformation; MECHANICAL-BEHAVIOR; DEFORMATION MODE; COMPRESSION; STRENGTH; STATE;
D O I：
10.1016/j.actamat.2012.03.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of structural relaxation on the deformation behavior of Ni60Nb40 glassy films was systematically investigated. The film and Ti substrate were co-bent and morphology evolution of the film during bending was monitored. With a decrease in thickness there was a mode change from highly localized to non-localized deformation, with the critical thickness dependent on annealing temperature. During co-bending only a proportion of the stored elastic energy in the metallic glassy film can transfer to the shear band due to the presence of the Ti substrate, which increases with annealing temperature due to the decrease in interfacial adhesion between the film and the substrate. Thus the decrease in critical thickness and the "thickness window" for deformation mode change caused by annealing arises from the enhanced hardness/Young's modulus and the reduced interfacial adhesion. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3667 / 3676
页数：10
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