Efficient microstructure refinement of AlSiMg alloy manipulated by nanocrystals formed by in-situ crystallization in melt

Zhu, L, Qiu, F and Qiu, D., et al, 2019, 'Efficient microstructure refinement of AlSiMg alloy manipulated by nanocrystals formed by in-situ crystallization in melt', Materials Science and Engineering A, vol. 751, pp. 90-98.


Document type: Journal Article
Collection: Journal Articles

Title Efficient microstructure refinement of AlSiMg alloy manipulated by nanocrystals formed by in-situ crystallization in melt
Author(s) Zhu, L
Qiu, F
Qiu, D., et al,
Year 2019
Journal name Materials Science and Engineering A
Volume number 751
Start page 90
End page 98
Total pages 9
Publisher Elsevier BV
Abstract AlSiMg alloys manipulated by in-situ synthesized nanoparticles have been prepared by casting method in this work. The addition of different contents of refiners promoted the obvious grain refinement of the AlSiMg alloys. It was found that 0.10 wt% refiners addition caused a significant and efficient refinement on α-Al (from 1675 µm to 199 µm) and Mg 2 Si in the inoculated AlSiMg alloys. The morphology of the eutectic Si in the inoculated AlSiMg alloys transformed from needle-like structure to a fibrous one, and the mean size sharply decreased (from 26.56 µm to 11.89 µm) and increased a little with the increase of FeBSi amorphous refiners content. Tensile property tests showed that both strength and ductility of the alloys were improved by the addition of FeBSi amorphous refiners. The yield strength, tensile strength, fracture strain and elongation of the alloy inoculated with 0.10 wt% FeBSi amorphous refiners for 20 min were 226 MPa, 343 MPa, 18.4% and 16.7%, compared to those of the uninoculated alloy (170 MPa, 289 MPa, 13.7% and 12.2%), respectively. It was found that the Fe 2 B and Fe 3 Si nano-sized particles which were crystallized from FeBSi amorphous refiner contributed to the grain refinement of α-Al, resulting in higher strength. Moreover, grain refinement shortened the atomic diffusion distance and refines Mg 2 Si. The grain refinement and spheroidization of eutectic Si enhance uniform deformation during tension, and reduce the possibility of crack initiation and expansion, thus improving the plasticity.
Subject Metals and Alloy Materials
Keyword(s) AlSiMg alloy
Grain refinement
Lattice mismatch
Spheroidization of eutectic Si
Strengthening mechanism
DOI - identifier 10.1016/j.msea.2019.02.072
Copyright notice © 2019 Elsevier BV
ISSN 0921-5093
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