Two-stage cracking of metallic bi-layers on polymer substrates under tension

SCRIPTA MATERIALIA

卷:145

Article

Putz, B.^1,2  May-Miller, C.^1,2  Matl, V.^1,2  Voelker, B.^1,2  Toebbens, D. M.³  Semprimoschnig, C.⁴  Cordill, M. J.^1,2 

[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[2] Univ Leoben, Dept Mat Phys, Jahnstr 12, A-8700 Leoben, Austria

[3] Helmholtz Zentrum Berlin Mat & Energie HZB, Albert Einstein Str 15, D-12489 Berlin, Germany

[4] European Space Res & Technol Ctr ESTEC, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

关键词: Thin films;    Fracture;    Fragmentation;   

DOI  :  10.1016/j.scriptamat.2017.09.039

来源: Elsevier

【 摘 要 】

This study demonstrates two-stage cracking of an Inconel silver film system on a flexible Teflon substrate under uniaxial tension. In situ fragmentation experiments revealed that primary fracture of the brittle 30 nm Inconel overcoat induced brittle, secondary fracture of the normally ductile 150 nm silver base layer. Good correlation exists between the ratios of primary and secondary saturation crack spacing and individual layer thicknesses. Two stage cracking was confirmed by cross-sectional analysis and explained by different steady state energy release rates of the individual layers. The results further illustrate how brittle layers are detrimental to the mechanical behaviour of polymer-supported thin film multilayer structures. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free