Bendable bulk metallic glass: Effects of a thin, adhesive, strong, and ductile coating

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Title:	Bendable bulk metallic glass: Effects of a thin, adhesive, strong, and ductile coating
Authors:	鄭憲清;Chu, Jinn P.;Greene, J.E.;Jang, Jason S.C.;Huang, J.C.;Shen, Yu-Lin;Liaw, Peter K.;Yokoyama, Yoshihiko;Inoue, Akihisa;Nieh, T.G.
Contributors:	工學院材料科學與工程研究所
Keywords:	Applied sciences;Bending test;Coating;Cross-disciplinary physics: materials science;rheology;Exact sciences and technology;Materials science;Metallic glasses;Metals. Metallurgy;Methods of deposition of films and coatings;film growth and epitaxy;Physics;Production techniques;Shear bands;Surface treatment
Date:	2012-04-01
Issue Date:	2026-04-23 11:28:57 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： We demonstrate, for the first time, that a thin, strong, ductile, and adhesive coating renders bulk metallic glasses (BMGs) bendable. The bending ductility of 3mm thick BMGs, Zr50Cu30Al10Ni10 in this case, can be dramatically enhanced from ∼0% to ∼13.7% by the deposition of a thin bilayer film on the tensile side of the BMG sample. The bilayer, consisting of a 25nm thick Ti adhesive layer with a 200nm thick metallic glass (MG) overlayer, exhibits the required synergistic combination of good adhesion, high strength, and ductility compared with other single-layer films examined (Ti, TiN, and MG). Cross-sectional scanning and transmission electron microscopy, together with finite element modeling, reveal that the bilayer coating absorbs deformation while allowing more homogeneous formation of a high density of smaller shear bands at the bilayer/BMG interface. The bilayer coating, in turn, covers surface weak points and minimizes the formation of localized shear bands which lead to catastrophic failure under bending. As a result, the average shear-band spacing in bilayer-coated BMGs is small, 54μm, and approximately equal to that found in bendable, 450μm thick, MG ribbons. Thus, coated BMGs can accommodate large strains and overcome the MG size effect, without sacrificing their extraordinary mechanical properties. Our results for both coated and uncoated BMGs, as well as previously reported results for uncoated metallic glasses, with thicknesses ranging from ribbons to thin plates to bulk, are well described by a simple power law relationship between plastic strain to failure and shear band spacing. This scaling law may be useful in guiding future experiments toward producing more flexible BMGs. 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-04-01 出處： Acta Materialia, 2012-04, Vol.60 (6-7), p.3226-3238 版權： 2012 Acta Materialia Inc. 版權： 2015 INIST-CNRS 識別號： ISSN: 1359-6454 識別號： EISSN: 1873-2453 識別號： DOI: 10.1016/j.actamat.2012.02.037
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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