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Nanoindentation investigation on the creep mechanism in metallic glassy films
Ma Y; Peng GJ; Feng YH(冯义辉); Zhang TH(张泰华); Zhang, TH (reprint author), Zhejiang Univ Technol, Coll Mech Engn, Hangzhou 310014, Zhejiang, Peoples R China.
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2016-01-10
Volume651Pages:548-555
ISSN0921-5093
AbstractUsing the magnetron sputtering technique, two metallic glassy films namely Cu44.3Zr45.1Al10.6 and Cu44.2Zr43Al11.3Ti1.5 were prepared by alloy targets. The minor Ti addition effectively induces excess free volume. Upon spherical nanoindentation, the creep behaviors of both films were studied at various peak loads. As the increase of peak load, the creep deformations became more severely in both samples. Interestingly, Cu-Zr-Al-Ti film crept stronger than Cu-Zr-Al at small-load holdings (nominal elastic regimes), whereas it is opposite at high-load holdings (plastic regimes). The creep characteristic could be intrinsically related to the scale variation of the shear transformation zone (STZ) with Ti addition. Statistical analysis was employed to estimate the STZ volume, which increased by 60% with Ti addition in the Cu-Zr-Al film. The finite element modeling indicated that STZs would be activated even at the minimum load we adopted. Higher activation energy of larger STZs in Cu-Zr-Al-Ti enables less flow units, which offsets the creep enhancement by the excess free volume with Ti addition. The deeper the pressed depth of the indenter, the more contribution of the STZ operation on creep deformation. In addition, experimental observation on the creep flow rates implies that STZ could be the dominating mechanism at the steady-state creep. This study reveals that STZ volume could also be important to the time-dependent plastic deformation in metallic glass, besides as a key parameter for instantaneous plasticity. (C) 2015 Elsevier B.V. All rights reserved.
KeywordMetallic Glass Nanoindentation Creep Free Volume Shear Transformation Zone
DOI10.1016/j.msea.2015.11.014
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000367486800065
WOS KeywordSHEAR TRANSFORMATION ZONES ; VISCOPLASTIC DEFORMATION ; PLASTIC-DEFORMATION ; INDENTATION CREEP ; AMORPHOUS-ALLOYS ; SIZE ; FLOW ; DYNAMICS ; BEHAVIOR
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationThe support from the National Natural Science Foundation of China (Grant nos. 11025212, 11272318, 11402233, 11302231 and 11502235) and Zhejiang Provincial Natural Science Foundation of China (Grant no. LQ15A020004) are gratefully acknowledged.
DepartmentLNM实验平台
Classification一类
RankingFalse
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58644
Collection非线性力学国家重点实验室
Corresponding AuthorZhang, TH (reprint author), Zhejiang Univ Technol, Coll Mech Engn, Hangzhou 310014, Zhejiang, Peoples R China.
Recommended Citation
GB/T 7714
Ma Y,Peng GJ,Feng YH,et al. Nanoindentation investigation on the creep mechanism in metallic glassy films[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2016,651:548-555.
APA Ma Y,Peng GJ,冯义辉,张泰华,&Zhang, TH .(2016).Nanoindentation investigation on the creep mechanism in metallic glassy films.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,651,548-555.
MLA Ma Y,et al."Nanoindentation investigation on the creep mechanism in metallic glassy films".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 651(2016):548-555.
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