Combined microalloying high-temperature-resistant aluminum alloy and preparation method thereof

Abstract

The invention provides a united microalloying high-temperature-resistant aluminum alloy and a preparation method thereof. The aluminum alloy comprises the following components in percentage by mass: 0.03 wt.% of Sb, 0.2 wt.% of Mn, 0.01 wt.% of Ti, 0.01 wt.% of Ti, 0.01 wt.% of Ti and the balance And the balance of Al-4wt.% Cu alloy. The preparation method comprises the following steps: (1) smelting in percentage by mass to obtain an aluminum alloy ingot containing Sb and Mn; (2) the aluminum alloy cast ingot in the step (1) is subjected to solution treatment; and (3) the aluminum alloy ingot subjected to solution treatment is subjected to artificial aging treatment, and the aluminum alloy is prepared. The particle size of an aging precipitation strengthening phase is reduced through combined microalloying of Sb and Mn, the high-temperature strength of the aluminum alloy is improved by improving the number density and thermal stability of the aging precipitation strengthening phase, the aluminum alloy has excellent high-temperature mechanical properties after short-time high-temperature exposure and long-time high-temperature thermal exposure, and the preparation process is simple.

Description

technical field [0001] The invention relates to an alloy material and a preparation method thereof, in particular to a combined microalloyed high temperature-resistant aluminum alloy and a preparation method thereof. Background technique [0002] Metal aluminum has attracted extensive attention in the industry due to its abundant reserves, low density, and good corrosion resistance. However, the strength and casting performance of pure aluminum are poor, and it is generally difficult to use it directly in the industry as a structural material, so it needs to be properly strengthened and its casting performance improved. The commonly used strengthening method is to add Mg and Cu to aluminum. The two solid solution elements are combined with the corresponding heat treatment to achieve the purpose of solid solution strengthening and aging strengthening, thereby significantly improving the hardness of the aluminum alloy. The casting properties of aluminum alloys can be signific...

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Problems solved by technology

However, the mechanical properties that can be improved simply by adding Cu and Mg can only work stably below 200°C. When the temperature is close to 300°C, the main strengthening phase will be coarsened and the strengthening effect will be lost. Therefore, improving the aluminum alloy at 300°C The high temperature strength at ℃ is particularly important

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