Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 3

Analysis of precipitation strengthening process in 2xxx aluminium alloys

10.15199/28.2016.3.2

nr katalogowy: 99367
10.15199/28.2016.3.2

This paper is showing the results of study devoted to determination of the chemical composition and strengthening process parameters effect on the precipitation sequence of intermetallic phases in the supersaturated 2xxx aluminium alloys. This study was based on a calorimetric study where temperature’s effects were determined when precipitation process occurred during heating with different heating rate of the supersaturated alloys group of 2xxx. Based on the calorimetric curves and estimated values of ln(Q/T2) and 1000/RT an activation energy for precipitation and dissolution of phase components were evaluated. Key words: aluminium alloys, precipitation strengthening, calorimetry, activation energy. Inżynieria Materiałowa 3 (211) (2016) 104÷108 DOI 10.15199/28.2016.3.2 © Copyright SIGMA-NOT MATERIALS ENGINEERING 1. INTRODUCTION The 2xxx series of aluminium alloys generally contain 2 up to 10% copper, with smaller additions of other elements. The copper provides substantial increases in strength and facilitates precipitation hardening. The introduction of copper to aluminum can also reduce ductility and corrosion resistance [1, 2]. Thus, the most common applications for these type of alloys are aerospace and automotive industries. Due to both the development of new alloys, as well as the constantly increasing demands on their performance, there was a still need to examine the effect of chemical composition, kinetic of precipitation processes from supersaturated solutions and the influence of strengthening phases on the final mechanical properties of newly developed aluminium alloys. The mechanism of age hardening responsible for strengthening is based on the formation of intermetallic products through the decomposition of a metastable supersaturated solid solution SSS obtained by solution treatment and quenching. Since the interactions between the decomposition products and the dislocations are mainly responsible for the[...]

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