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Multilevel microstructure control of cast Al–7.0Si–4.0Cu alloy with high strength–toughness synergy viamicro-alloying combined with manipulation by in-situnano-ceramics
- Source :
- Journal of Materials Research and Technology; November-December 2022, Vol. 21 Issue: 1 p3248-3261, 14p
- Publication Year :
- 2022
-
Abstract
- Incident Ti–Si poisoning when applying traditional agents of microstructure manipulation in Al–Si alloys is always adverse to realize multilevel microstructure control. This work combined the manipulation by physically formed in-situnano-ceramics from Fe79.58B11.26Si9.26amorphous alloy and the micro-alloying to comprehensively improve the microstructure configuration of Al–7.0Si–4.0Cu alloy. It was suggested that micro-alloying of Mg and Sb prominently refined α-Al dendrites and eutectic silicon. Micro-alloying with Mg increased the nucleating temperature of α-Al, meanwhile Mg atoms can hinder the growth of α-Al and eutectic silicon. Sb atoms can also be adsorbed to the growth interfaces of eutectic silicon hindering the growth process. On this basis, trace Fe79.58B11.26Si9.26amorphous alloy brought further optimization on α-Al dendrites and eutectic silicon, especially Al2Cu and Mg2Si, realizing the multilevel microstructure control. In-situFe2B and Fe3Si nano-ceramics were confirmed to have low lattice misfits with α-Al and silicon, serving as efficient nucleation sites and growth retardants. After combined micro-alloying and manipulation, the mean sizes of α-Al and eutectic silicon were significantly refined by 72.7% and 79.9%, respectively, meanwhile, the ultimate tensile strength (UTS) and plastic strain (δ) were improved to 480 MPa and 9.4%, corresponding to 30.1% and 77.4% improvement, respectively. This work provides new mentality to realize multilevel microstructure control and improvement of strength–toughness synergy in Al–Si alloys.
Details
- Language :
- English
- ISSN :
- 22387854
- Volume :
- 21
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Journal of Materials Research and Technology
- Publication Type :
- Periodical
- Accession number :
- ejs61442005
- Full Text :
- https://doi.org/10.1016/j.jmrt.2022.10.140