Effect of pre-ageing on nucleating of GP zones and precipitation, strength and stress corrosion properties of 7N01 alloy
Source abstract
Abstract
Three ageing treatments, known as T6, T74, and P-T74 (a pre-ageing treatment followed by a T74 treatment) were carried out to investigate their effects on aluminium alloy 7N01. The aspects investigated included the alloy’s mechanical properties, microstructure, electrochemical behaviours, and resistance to stress corrosion cracking (SCC). The experimental results showed that in comparison with T74, P-T74 can effectively increase the density of GPI zones in the early stage giving rise to more nucleation sites for the subsequent η′ phase. T74 guarantees more GPII zones than does T6, but only a fraction can transform into the η` phase, which leads to the lowest hardness and mechanical strength of all treated alloys studied here. Compared with the T6 and T74 ageing treatments, P-T74 showed the highest self-corrosion potential, lowest self-corrosion current density, and largest spacing between the η phase along the grain boundaries, which was an indicator of its increased resistance to SCC.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Microstructure and mechanical properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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