A heat treatment method for improving toughness of Al-Si alloy
By adding Zr, Er, Sc and Mg to Al-Si alloys, combined with low-temperature short-time holding and two-stage aging treatment, Al3(Sc,Zr,Er) particles and Mg5Si6 phase are formed, which solves the problems of uneven mechanical properties and substandard toughness of Al-Si alloy castings, and improves the toughness and strength of the castings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA HANGFA SOUTH IND CO LTD
- Filing Date
- 2026-06-01
- Publication Date
- 2026-07-17
AI Technical Summary
Existing Al-Si alloys suffer from uneven mechanical properties and substandard toughness in the production of large-size castings. This is mainly due to the reduction in the content of Mg5Si6 precipitates and the coarsening of grains caused by Mg burn-off and storage effects, which affect strength and toughness.
By adding Zr, Er, Sc and Mg to the Al-Si alloy melt, combined with low-temperature short-time holding and two-stage aging treatment, Al3(Sc,Zr,Er) particles and Mg5Si6 phase are formed, providing heterogeneous nucleation cores, refining grains and improving the density and uniformity of precipitated phases.
It significantly improves the toughness and strength of Al-Si alloys, with elongation after fracture and impact toughness increasing by 80% and 44% respectively, solving the problem of toughness reduction caused by Mg burn-off and storage effect.
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Abstract
Citation Information
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