Size effect in the Al3Sc dispersoid-mediated precipitation and mechanical/electrical properties of Al-Mg-Si-Sc alloys

doi:10.1016/j.jmst.2020.03.056

Abstract

Abstract:

A significant size effect is found in the Al₃Sc dispersoid-mediated precipitation in an Al-Mg-Si-Sc alloy. When the Al₃Sc dispersoid size smaller than about 40 nm, β″ precipitates nucleate directly on the coherent dispersoids and grow by sacrificing the latter. While the dispersoid size greater than ～ 40 nm, Q' and U2 phases are additionally produced that nucleate on the dislocations induced by the semi-/incoherent dispersoids. Mechanical and electrical properties are highly sensitive to the Al₃Sc dispersoid-tuned precipitation. The co-precipitation of β″, Q' and U2 phases leads to an obvious improvement in hardness and simultaneously in electrical conductivity.

Key words: Al-Mg-Si-Sc alloy, Al₃Sc dispersoids, Precipitation, Size effect, Hardness and conductivity

Ruihong Wang, Shengyu Jiang, Bao’an Chen, Zhixiang Zhu. Size effect in the Al₃Sc dispersoid-mediated precipitation and mechanical/electrical properties of Al-Mg-Si-Sc alloys[J]. J. Mater. Sci. Technol., 2020, 57: 78-84.

Figures/Tables 4

Fig. 1. Representative TEM images to show the Al3Sc dispersoids in the FA-I (a and c) and the FA-II (b and d) samples. (a) and (b) are in low magnification, and (c) and (d) in high magnification. Inset in (c) is a picture overlapping the corresponding GPA εxx strain field with the HRTEM image. The statistical size distribution of Al3Sc dispersoids is shown in (e) and (f), respectively, for the FA-I and FA-II samples.

Fig. 2. Representative TEM images to show the precipitates in the SA-I sample aged for 4 h (a) and 8 h (b), respectively. (c) is a magnified TEM image in the 8 h-aged SA-I sample. (d) - (f) are representative TEM image, locally magnified HRTEM image, and corresponding GPA image (overlapping on the HRTEM image) to demonstrate a β″ nucleus on a coherent Al3Sc dispersoid. (h) and (i) are representative TEM images to show two and three β″ nuclei on a Al3Sc dispersoid. The structure of β″ is determined from (j).

Fig. 3. (a) A representative TEM image to show the precipitation around a coarse Al3Sc dispersoid with a size of ～ 70 nm in the SA-II sample aged for 4 h. The precipitates marked by arrows are Q' phase and marked by triangles are U2 phase. (b) - (d) are representative TEM images and corresponding structural analysis of the lath-shaped Q' precipitates. (e) - (g) are cross-sectional TEM images and corresponding structural analysis of the U2 precipitates.

Fig. 4. Hardness vs. electrical conductivity of the FA-I (open diamond), FA-II (open circle), SA-I (solid circles), and SA-II (solid diamonds) samples for comparison. The properties of Sc-free Al-Mg-Si alloy are also given for reference (half-solid hexagon).

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Size effect in the Al₃Sc dispersoid-mediated precipitation and mechanical/electrical properties of Al-Mg-Si-Sc alloys

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