A heat-free aluminum alloy and its preparation method

By adding specific elements and processing techniques to Al-Si aluminum alloys, the problems of insufficient thermal conductivity, corrosion resistance, and strength in die casting of aluminum alloys have been solved. This has enabled the preparation of aluminum alloys with high corrosion resistance, high thermal conductivity, and high strength and toughness, which are suitable for die casting production and can be applied in the electronics, communications, and new energy vehicle industries.

CN117987701BActive Publication Date: 2026-07-17HUNAN JIANGBIN MASCH GRP CORP LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN JIANGBIN MASCH GRP CORP LTD
Filing Date
2024-02-04
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing aluminum alloys are difficult to simultaneously achieve high thermal conductivity, high corrosion resistance, and high strength and toughness in die casting, and require heat treatment processes, which affect production efficiency and cost.

Method used

An Al-Si aluminum alloy was developed, containing 6–11% Si, 0.4–1.1% Mg, 0.2–0.6% Sn, 0.05–0.25% Ti, 0.05–0.2% Zn, 0.01–0.025% Sr, and ≤0.35% Fe. It was prepared using a segmented degassing process and die casting, avoiding heat treatment. The addition of Mg, Sn, and Zn elements forms the Mg2Sn phase, and Sr forms an adsorption film, refining the grain size and inhibiting corrosion.

Benefits of technology

This invention achieves an aluminum alloy with high corrosion resistance, high thermal conductivity, and high strength and toughness, suitable for die casting production, eliminating the need for heat treatment, and improving the overall performance of the material and production efficiency.

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Abstract

This application discloses a heat-free aluminum alloy, the composition of which and the mass percentage of each component are as follows: Si 6-11, Mg 0.4-1.1, Sn 0.2-0.6, Ti 0.05-0.25, Zn 0.05-0.2, Sr 0.01-0.025, Fe≤0.35, with the remainder being Al. The contents of Mg, Sn, and Zn (X, Y, Z) satisfy the following relationships: 0.45Y+0.24Z+0.1≤X≤0.75Y+0.44Z+0.4; 0.2≤Sn≤0.6; 0.05≤Zn≤0.2. This application also provides a method for preparing the heat-free aluminum alloy. This application develops an Al-Si aluminum alloy system with high corrosion resistance, high thermal conductivity, and high strength and toughness suitable for die casting production. It can ensure excellent corrosion resistance and good thermal conductivity, while also meeting certain casting properties, strength, and plasticity requirements; and it does not require heat treatment.
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