Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2017 - zeszyt 1

Effect of heat treatment on quality and properties of solid bonded 6061 aluminum alloy

10.15199/28.2017.1.6

nr katalogowy: 104143
10.15199/28.2017.1.6

In these studies, the effect of heat treatment on solid bonded AA6061 aluminium alloy has been investigated. The examined material in the form of powder and rapidly solidified ribbons was subjected to pre-compacting and extrusion carried out at elevated temperature. As a reference material, a billet from the solid AA6061 alloy was subjected to the same procedure. Samples of obtained profiles were subjected to the subsequent heat treatment operation. Surface quality and mechanical properties of materials before and after annealing were compared. The increase in mechanical properties was accompanied by a well visible post-heat treatment blistering effect. Key words: heat treatment, solid bonding, aluminium alloy.1. INTRODUCTION High popularity of Al-Mg-Si alloys in the extrusion industry is mainly derived from their unique properties such as high specific strength, good corrosion resistance, and excellent formability. Furthermore, the heat treatability of these alloys allows improving their mechanical properties though at the cost of ductility [1, 2]. Technical literature provides rich information on the kinetics of Al-Mg-Si precipitation strengthening [3÷7]. According to [8], the precipitation sequence can be divided into the following stages: Al SSS → clusters of Si/Mg → GP zones → β″ → (βʹ + U2 + U1 + Bʹ) → β In the early phase of heat treatment, “clustering" of Si and Mg atoms occurs inside the saturated solid solution (Al SSS) and is followed by subsequent dissolution of Mg clusters and formation of Mg/Si co-clusters. These structural changes lead to exothermic effects and changes in electrical properties [4]. GP zones are the first important metallic phase that arises during precipitation strengthening and is stabilized by high silicon content [9]. The major hardening effect in Al-Mg-Si alloys is attributed to the presence of the needle-shaped β″ phase[...]

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