Microstructural evolution, precipitation behavior and mechanical properties of a novel Al–Zn–Mg–Cu–Li–Sc–Zr alloy
Source abstract
Abstract
Microstructural evolution, precipitation behavior, mechanical properties and strengthening mechanism of a novel Al–Zn–Mg–Cu–Li–Sc–Zr alloy (7075-1.2Li–0.1Sc–0.1Zr alloy, wt%) were investigated. The strong tendency for preferential precipitation of Al3Li was observed. After single-stage aging (120 °C/48 h), the main precipitation phase was core–shell Al3(Sc, Zr, Li), consisting of Al3(Sc, Zr) core formed at homogenization (460 °C/32 h) and Al3Li-shell formed at subsequent aging. However, under two-stage aging (120 °C/16 h + 150 °C/48 h), co-precipitation of core–shell Al3(Sc, Zr, Li) and rod-shape η′ (MgZn2) happened, triggering the further improvement in microhardness of Al–Zn–Mg–Cu–Li–Sc–Zr alloy. The grain boundary precipitates (GBPs) and precipitate free zones (PFZs) existed in the alloys after both single-stage aging and two-stage aging. The strength of Al–Zn–Mg–Cu–Li–Sc–Zr alloy was gradually improved after two aging treatments, however, the ductility was continuously decreased. The strengthening mechanisms of Al3(Sc, Zr, Li) and η′ (MgZn2) at single-step and two-step aging treatments were both bypass strengthening.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
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References (42)
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