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Evolution of bonding interface in solid-liquid cast-rolling bonding of Cu/Al clad strip

Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1019-1025页

作者： Hua-gui HUANG Yi-kang DONG Meng YAN Feng-shan DU National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China

Cu/Al clad strips are prepared using solid?liquid cast-rolling bonding(SLCRB)technique with a d160mm×150mm twin-roll experimental *** extent of interfacial reactions,composition of the reaction products,and their micro-morphology evolution in the SLCRB process are investigated with scanning electron microscope(SEM),energy dispersive spectrometer(EDS),and X-ray diffraction(XRD).In the casting pool,initial aluminized coating is first generated on the copper strip surface,with the diffusion layer mainly consisting ofα(Al)+CuAl2and growing at high temperatures,with the maximum thickness of10μ*** sequent rolling below the kiss point,the diffusion layer is broken by severe elongation,which leads to an additional crack bond process with a fresh interface of virgin base *** average thickness is reduced from10to5μ*** reaction products,CuAl2,CuAl,and Cu9Al4,are dispersed along the rolling *** and bending test results indicate that the fracture occurs in the aluminum substrate,and the morphology is a dimple *** crack or separation is found at the bonding interface after90°-180°*** presented method provides an economical way to fabricate Cu/Al clad strip directly.

关键词： Cu/Al clad strip solid.liquid cast-rolling bonding bonding interface reaction diffusion peeling test

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A Dugdale model based geometrical amplifier enables the measurement of separation-to-failure for a cohesive interface

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Theoretical & Applied Mechanics Letters 2011年第1期1卷 25-29页

作者： Yu-Jie Wei~(a)) State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences, Beijing 100190,China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

Regardless of all kinds of different formulae used for the traction-separation relationship in cohesive zone modeling,the peak tractionσ_m and the separation-to-failureδ_0(or equivalently the work-to-separationΓ) are the primary parameters which control the interfacial fracture behaviors. Experimentally,it is hard to determine those quantities,especially forδ_0,which occurs in a very localized region with possibly complicated geometries by material *** on the Dugdale model,we show that the separation-to-failure of an interface could be amplified by a factor of L/r_p in a typical peeling test,where L is the beam length and r_p is the cohesive zone *** an amplifier makesδ_0 feasible to be probed quantitatively from a simple peeling test. The method proposed here may be of importance to understanding interfacial fractures of layered structures,or in some nanoscale mechanical phenomena such as delamination of thin films and coatings.

关键词： cohesive zone dugdale model separation-to-failure thin film peeling test

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