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Title: Low-cycle fatigue of metallic glass nanowires

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Publication Date:
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
Grant/Contract Number:
00119262; FE-0008855; FE0011194
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 87; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-05-18 09:12:12; Journal ID: ISSN 1359-6454
Country of Publication:
United States

Citation Formats

Luo, Jian, Dahmen, Karin, Liaw, Peter K., and Shi, Yunfeng. Low-cycle fatigue of metallic glass nanowires. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2014.12.038.
Luo, Jian, Dahmen, Karin, Liaw, Peter K., & Shi, Yunfeng. Low-cycle fatigue of metallic glass nanowires. United States. doi:10.1016/j.actamat.2014.12.038.
Luo, Jian, Dahmen, Karin, Liaw, Peter K., and Shi, Yunfeng. 2015. "Low-cycle fatigue of metallic glass nanowires". United States. doi:10.1016/j.actamat.2014.12.038.
title = {Low-cycle fatigue of metallic glass nanowires},
author = {Luo, Jian and Dahmen, Karin and Liaw, Peter K. and Shi, Yunfeng},
abstractNote = {},
doi = {10.1016/j.actamat.2014.12.038},
journal = {Acta Materialia},
number = C,
volume = 87,
place = {United States},
year = 2015,
month = 4

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.actamat.2014.12.038

Citation Metrics:
Cited by: 13works
Citation information provided by
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  • In this paper, a coating of the Zr-based thin-film metallic glass (TFMG) was deposited on the Zr 50Cu 30Al 10Ni 10 bulk metallic glass (BMG) to investigate shear-band evolution under four-point-bend fatigue testing. The fatigue endurance-limit of the TFMG-coated samples is ~ 33% higher than that of the BMG. The results of finite-element modeling (FEM) revealed a delay in the shear-band nucleation and propagation in TFMG-coated samples under applied cyclic-loading. The FEM study of spherical indentation showed that the redistribution of stress by the TFMG coating prevents localized shear-banding in the BMG substrate. Finally, the enhanced fatigue characteristics of themore » BMG substrates can be attributed to the TFMG coatings retarding shear-band initiation at defects on the surface of the BMG.« less
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  • Compared to their crystalline counterparts, nanowires made of metallic glass have not only superb properties but also remarkable processing ability. They can be processed easily and cheaply like plastics via a wide range of methods. To date, the underlying mechanisms of how these different processing routes affect the wires' properties as well as the atomic structure remains largely unknown. Here, by using atomistic modeling, we show that different processing methods can greatly influence the mechanical properties. The nanowires made via focused ion beam milling and embossing exhibit higher strength but localized plastic deformation, whereas that made by casting from liquidmore » shows excellent ductility with homogeneous deformation but reduced strength. The different responses are reflected sensitively in the underlying atomic structure and packing density, some of which have been observed experimentally. The presence of the gradient of alloy concentration and surface effect will be discussed.« less
  • Nanowires made of metallic glass have been actively pursued recently due to the superb and unique properties over those of the crystalline materials. The amorphous nanowires are synthesized either at high temperature or via mechanical disruption using focused ion beam. These processes have potential to cause significant changes in structure and chemical concentration, as well as formation of defect or imperfection, but little is known to date about the possibilities and mechanisms. Here, we report chemical segregation to surfaces and its mechanisms in metallic glass nanowires made of binary Cu and Zr elements from molecular dynamics simulation. Strong concentration deviationmore » are found in the nanowires under the conditions similar to these in experiment via focused ion beam processing, hot imprinting, and casting by rapid cooling from liquid state. Our analysis indicates that non-uniform internal stress distribution is a major cause for the chemical segregation, especially at low temperatures. Extension is discussed for this observation to multicomponent metallic glass nanowires as well as the potential applications and side effects of the composition modulation. The finding also points to the possibility of the mechanical-chemical process that may occur in different settings such as fracture, cavitation, and foams where strong internal stress is present in small length scales.« less
  • The recent development of metallic alloy systems which can be processed with an amorphous structure over large dimensions, specifically to form metallic glasses at low cooling rates ({approximately}10 K/s), has permitted novel measurements of important mechanical properties. These include, for example, fatigue-crack growth and fracture toughness behavior, representing the conditions governing the subcritical and critical propagation of cracks in these structures. In the present study, bulk plates of a Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} alloy, machined into 7 mm wide, 38 mm thick compact-tension specimens and fatigue precracked following standard procedures, revealed fracture toughnesses in the fully amorphous structuremore » of K{sub Ic}{approximately}55 MPa{radical}m, i.e., comparable with that of a high-strength steel or aluminum alloy. However, partial and full crystallization, e.g., following thermal exposure at 633 K or more, was found to result in a drastic reduction in fracture toughness to {approximately}1 MPa{radical}m, i.e., comparable with silica glass. The fully amorphous alloy was also found to be susceptible to fatigue-crack growth under cyclic loading, with growth-rate properties comparable to that of ductile crystalline metallic alloys, such as high-strength steels or aluminum alloys; no such fatigue was seen in the partially or fully crystallized alloys which behaved like very brittle ceramics. Possible micromechanical mechanisms for such behavior are discussed. {copyright} {ital 1997 American Institute of Physics.}« less