1. Achieving fully equiaxed grains with minor Sc addition of a novel Al-Li alloy fabricated by laser direct energy deposition.
- Author
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Sun, Zeyu, Shao, Wenpeng, He, Bei, and Wang, Huaming
- Subjects
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ALUMINUM-lithium alloys , *PRECIPITATION (Chemistry) , *GRAIN , *COPPER , *THERMOCYCLING , *LASERS - Abstract
[Display omitted] • A novel Al-Cu-Li-Mg-Ag-Sc alloy was fabricated by laser direct energy deposition. • The fully equiaxed grain structure of as-built alloy can be obtained by adding 0.3 wt% Sc. • The precipitation behavior of primary Al 3 Sc particles was studied based on transient nucleation theory. • T 1 , Al 3 Sc, T B , and quasicrystalline T 2 phases serve as primary strengthening phases. In this study, a novel Al-Li alloy with minor Sc addition was fabricated by laser directed energy deposition (LDED), resulting in a fully equiaxed grain structure. The precipitation behavior of primary Al 3 Sc particles was studied based on transient nucleation theory, and the results showed that sufficient heterogeneous nuclei by primary Al 3 Sc particles could preferentially form at initial solidification stage and induce into equiaxed grains. Besides, a large number of acicular T 1 (Al 2 CuLi) phases and spherical Al 3 Sc phases, as well as rod-shaped T B (Al 7 Cu 4 Li) phases and quasicrystalline T 2 (Al 6 CuLi 3) phases, were distributed in as-built alloy that served as primary strengthening phases by thermal cycling. However, the specific nucleation behavior of α-Al grains on primary Al 3 Sc particles and subsequent growth behavior during rapid solidification need to be further investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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