Effect of Sn Alloying on the Diffusion Bonding Behavior of Al-Mg-Si Alloys
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Effect of Sn Alloying on the Diffusion Bonding Behavior of Al-Mg-Si Alloys SILA ECE ATABAY, ZIYA ESEN, and ARCAN F. DERICIOGLU Effect of Sn as an alloying element on the diffusion-bonding behavior of Al-Mg-Si alloy has been studied by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical testing of the diffusion-bonded joint. XRD results revealed the formation of Mg2Sn and (Sn) phases during solidification following induction casting. DSC results showed local liquid (Sn) formation during the bonding process for Sn-containing alloys, where its amount was found to be increasing with the increasing Sn content. Results revealed that Sn addition leads to an increase in the bond shear strength of the diffusion-bonded joints and elimination of the irregularities formed on the bonded interface. Fractured surfaces showed that formation of (Sn) layer at the bonded interface causes the fracture to transform from the ductile to the mixed fracture mode. DOI: 10.1007/s11661-017-4089-7 The Minerals, Metals & Materials Society and ASM International 2017
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INTRODUCTION
DEVELOPMENT of new joining techniques draws increasing attention due to the need in smart fabrication methods of structural materials to make them available for multifunctional engineering tasks.[1] Diffusion bonding (DB) is a widely used industrial joining technique applied on both similar and dissimilar materials without causing any macroscopic deformation and uncontrolled phase transformations.[2] DB is a solid-state joining technique controlled mainly by three important process parameters: time, temperature, and pressure which should be adjusted precisely to control the microstructure scale to obtain the desired properties.[3–5] Bonding temperature should be from 0.5 to 0.8 of the melting point (Tm) of the processed material, and the applied pressure should be below the yield strength of the material at the process temperature to prevent macroscopic deformation during the bonding.[6] Holding time should be high enough to form a solid joint without causing any degradation in the physical and chemical properties of the base material.[7–9] Al-Mg-Si alloys (6000 series Al alloys) have widespread applications as structural materials highly in-demand due to the combined properties of their high strength, good formability, and high corrosion resistance.[10,11] These alloys have the potential of SILA ECE ATABAY and ARCAN F. DERICIOGLU are with the Metallurgical and Materials Engineering Department, Middle East Technical University, 06800, Ankara, Turkey. Contact e-mail: [email protected] ZIYA ESEN is with the Department of Materials Science and Engineering, Cankaya University, 06810 Ankara, Turkey. Manuscript submitted January 9, 2017. Article published online April 24, 2017 METALLURGICAL AND MATERIALS TRANSACTIONS A
precipitation hardening with the formation of the intermetallic compound Mg2Si via solution treatment and artificial aging.[12,13] Despite all of these properties, the stable oxide film form
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