Solderable heat treatment free die cast aluminium alloy and method of making same

By adjusting the aluminum alloy composition and high-pressure die casting process, a heat-free die-cast aluminum alloy that can be brazed was prepared. This solved the problems of softening and porosity defects in aluminum-silicon cast aluminum alloys during high-temperature brazing, achieving high-temperature brazing reliability and castability, and is suitable for brazing automotive parts.

CN118166241BActive Publication Date: 2026-07-24SAIC MOTOR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SAIC MOTOR
Filing Date
2024-01-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing aluminum-silicon cast aluminum alloys have low melting points during high-temperature brazing, leading to material softening and porosity defects, and even melting, making it difficult to achieve reliable brazing of dissimilar aluminum alloys.

Method used

By adjusting the composition of aluminum alloys, including the proportions of Si, Mn, Fe, Mg, Ti, V, Ga, Sn, B, Ni, and RE, a heat-free die-cast aluminum alloy that can be brazed is prepared. Combined with high-pressure die-casting process, this ensures that the alloy does not soften during high-temperature brazing and reduces porosity defects.

Benefits of technology

It achieves high-temperature brazing and castability of aluminum alloys, with as-cast tensile strength, yield strength and elongation reaching 266MPa, 143MPa and 11.6% or more, respectively. It also has excellent fluidity and is suitable for brazing automotive parts.

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Abstract

The application provides a brazable heat treatment-free die-casting aluminum alloy and a preparation method thereof. The heat treatment-free die-casting aluminum alloy comprises Si: 0.03-0.5 wt.%, Mn: 1.0-3.5 wt.%, Fe 0.6-2.3 wt.%, Mg 0.1-0.8 wt.%, Ti 0.05-0.32 wt.%, V 0.008-0.15 wt.%, Ga 0.008-0.026 wt.%, Sn 0.001-0.06 wt.%, B 0.001-0.05 wt.%, Ni 0.005-1.6 wt.%, and RE 0-4.8 wt.%. The heat treatment-free die-casting aluminum alloy has a tensile strength of greater than or equal to 266 MPa, a yield strength of greater than or equal to 143 MPa, and an elongation of greater than or equal to 11.6%, and the aluminum alloy has a solidus temperature of greater than or equal to 632.06 DEG C, thereby achieving good brazability and castability.
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