Year-end Sale % OFF 
Abstract
The precipitation process and reaction kinetics during artificial aging, precipitate microstructure, and mechanical properties after aging of AlMgSi alloys were investigated employing in-situ electrical resistivity measurement, Transmission Electron Microscopy (TEM) observation, and tensile test methods. Three aging stages in sequence, namely formation of GP zones, transition from GP zones to β″ phase, transition from β″ to β′ phase, and coarsening of both phases, were clearly distinguished by the variation of the resistivity. It was discussed together with the mechanical properties and precipitate morphology evolution. Fast formation of GP zones and β″ phase leads to an obvious decrease of the resistivity and increase of the mechanical strength. The formation of β″ phase in the second stage, which contributes to the peak aging strength, has much higher reaction kinetics than reactions in the other two stages. All of these stages finished faster with higher reaction kinetics under higher temperatures, due to higher atom diffusion capacity. The results proved that the in-situ electrical resistivity method, as proposed in the current study, is a simple, effective, and convenient technique for real-time monitoring of the precipitation process of AlMgSi alloys. Its further application for industrial production and scientific research is also evaluated.
Highlights
The light weighting features of the precipitation hardened AlMgSi aluminum alloys trigged tremendous investigation interest in recent years [1,2,3,4,5]
They were stored for one month before conducting artificial aging. 150 ◦ C, 175 ◦ C, and 195 ◦ C were selected as low, medium, and high artificial aging temperatures, which can be considered as representative of the temperatures in industrial production
Sequence is obviously related to the precipitate phase type, particle size, and reaction kinetics, since analysis. This sequence is obviously related to the precipitate phase type, particle size, and reaction different precipitates contribute to the electrical resistivity and strengthening effect in a markedly kinetics, since different precipitates contribute to the electrical resistivity and strengthening effect in a different manner [21,25]
Summary
The light weighting features of the precipitation hardened AlMgSi aluminum alloys trigged tremendous investigation interest in recent years [1,2,3,4,5]. The precipitation behavior during the heat treatment process plays a decisive role in final performance of the AlMgSi alloys. Properties of these alloys, e.g., workability, mechanical strength, electrical conductivity, corrosion resistance etc., are greatly determined by the phase type, morphology, size distribution, and number density of their precipitates [1,3,6,7,8,9]. Significant achievements in the characterization of the precipitation behavior of AlMgSi alloys have been reached since the end of last centenary, with the assistance of advancing technologies, like High Resolution Transmission Electron Microscopy (HRTEM) [5,6,7,10,11,12,13], Atom Probe. The precipitation sequence has been established and gradually accepted as: supersaturated solid solution (SSSS)→clusters/GP
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
