Aluminum-silicon alloy and die-casting process thereof

By using a refiner composed of aluminum (Al), titanium (Ti), carbon (C), boron (B) and strontium (Sr) in the die-casting process of aluminum-silicon alloy, combined with pressure and mold chilling technology, the refinement and modification effects of aluminum-silicon alloy are achieved, solving the problems of coarse structure and poor tensile properties of existing aluminum-silicon alloys, and producing aluminum alloy castings with uniform and fine structure and excellent performance.

CN119501013BActive Publication Date: 2025-09-19NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Application Number
CN202411803925.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-09-19
Estimated Expiration
2044-12-10

AI Technical Summary

Technical Problem

Existing aluminum-silicon alloy refiners are insufficient in terms of refinement and modification effects, resulting in coarse alloy structure and poor tensile properties.

Method used

A refiner composed of aluminum (Al), titanium (Ti), carbon (C), boron (B) and strontium (Sr) is added and stirred during the semi-solid slurrying process. Through the dual effects of pressure and mold chilling, the primary grains and dendrites are refined and modified to form a dense casting.

Benefits of technology

The microstructure uniformity and performance of aluminum-silicon alloys have been significantly improved, the problems of coarse grains and poor tensile properties have been solved, and aluminum alloy castings with uniform and fine structure, excellent strength and plasticity have been achieved.

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Abstract

The present invention relates to an aluminum-silicon alloy and a die-casting process thereof. The die-casting process of the aluminum-silicon alloy comprises: melting the alloy raw material, degassing and refining, and performing semi-solid slurrying; adding a refiner during the semi-solid slurrying process; stirring; lowering the temperature of the semi-solid alloy melt and continuously stirring to achieve a one-time refinement and metamorphism of the primary grains and broken dendrites formed in the semi-solid slurry to obtain a semi-solid alloy melt; and solidifying and forming the semi-solid alloy melt, and quenching the semi-solid alloy melt to obtain an aluminum-silicon alloy casting. The present invention also provides an aluminum-silicon alloy produced by a die-casting process. The present invention solves the problem that existing refiners cannot simultaneously meet the requirements of good refinement and metamorphism effects, and also solves the problem that existing aluminum-silicon alloy die-castings have coarse structure and poor tensile properties.
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