Abstract
Aluminium alloy foam is a lightweight material with high energy absorption properties and can potentially replace bulk Al-components. The aim of this work is to develop a brazing technique to join aluminium facing sheets to aluminium alloy foam to obtain aluminium foam sandwich panels for applications where high service temperature is a requirement. Al-6016 alloy sheets were brazed to aluminium alloy foam using two aluminium based (Al-Cu-Mg and Al-Si-Mg-Ti) metal glasses at 560 °C–590 °C in an argon atmosphere. Microstructure and microhardness profiles of the aluminium alloy sheet/aluminium alloy foam brazed joints were analysed using a microhardness tester and scanning electron microscope equipped with electron dispersion spectroscopy. A three-point bending test was conducted to study the flexural behaviour of the aluminium foam sandwich composite panels.
Highlights
Aluminium foam sandwich (AFS) panels, compared to bulk Al components of the same mass, are multifunctional, stiffer, and offer excellent corrosion resistance for many industrial applications including automotive, marine, aerospace, construction and railway [1,2]
All three-point bending tests weremodes conducted using a universal testing machine (MTS-810 behaviour of Al-alloy foam and the failure of AFS components were determined by analysing digital images and video recorded fortemperature each test event. (25 ◦ C) and 65% relative humidity
Analysis of Al-alloy foam and the failure of AFS components were determined by analysing digital images and the video recorded for each testofevent
Summary
Aluminium foam sandwich (AFS) panels, compared to bulk Al components of the same mass, are multifunctional, stiffer, and offer excellent corrosion resistance for many industrial applications including automotive, marine, aerospace, construction and railway [1,2]. Most recently Al-alloy metal foam parts were developed by the Technical University. Different applications of AFS have led to the development of various Al-alloy foam manufacturing and Al-alloy foam/Al-alloy sheet joining techniques, such as casting, brazing [5], and soldering [6]. The current practice of AFS components joining using adhesives and solders restrict the applications of AFS composite panels in the range 220 ◦ C–380 ◦ C. The fabrication of AFS composite panels for higher service temperatures requires alternative joining methods and materials, which is focused in this study. The AFS obtained by brazing the facing sheets to the core can meet the heat resistance, stability at elevated temperatures and non-flammability requirements, which are not satisfied when the facing sheets are joined to the core by an adhesive or a solder alloy [7]
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