Effect of T6I4 with different aging time on microstructure and properties of high strength aluminum alloy
Source abstract
Abstract
The microstructures of high strength alloy (Al–11.0Zn–3.1Mg–1.22Cu–0.1Sr–0.2Zr–0.1Ti–0.45Y) subjected to T6 and three various T6I4 aging treatments were characterized to explore their influences on the corrosion behavior and mechanical properties of alloys, respectively. The result reveals that after T6 aging, the relatively large sizeη′ andηphases are the dominant precipitates, and the grain boundary precipitates (GBPs) are intermittently distributed along grain boundaries. In contrast, when subjected to T6I4, the average radius of precipitates and the average precipitate spacing decreases in that primary phases precipitated during pre-aging provides more nucleation sites. In addition, continuous GBPs is observed. Upon the prolongation of aging time, the precipitates gradually coarsen, resulting in a decrease of the density of precipitates in grains and the appearance of intermittent GBPs. The optimal comprehensive performance can be obtained after the T6I4(121 ℃ × 6 h(Quenching) + 65 ℃ × 120 h) treatment, with tensile strength of 797.932 MPa and the maximum corrosion depth of 51.63 μm.Graphical abstract
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (61)
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