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Thermal cracking resistant Al-Cu series cast aluminum alloy and preparation method thereof

A technology of casting aluminum alloy and anti-hot cracking, which is applied in the field of casting alloys, can solve the problems of difficulty in improving the yield and application range, poor alloy casting performance, and large tendency of hot cracking, etc., and achieve excellent thermal cracking resistance and thermal cracking resistance Effects of performance improvement and production cost reduction

Active Publication Date: 2020-04-21
LANZHOU FLIGHT CONTROL
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Problems solved by technology

However, it has the following disadvantages: Although it has high strength, the castability of the alloy is very poor, which shows that the tendency of hot cracking is relatively large, feeding is difficult, and it is difficult to improve the yield and application range

Method used

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Embodiment Construction

[0022] The following introductions are some of the many possible implementation cases of the present invention, aiming to provide a basic understanding of the present invention, but not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0023] The application provides the following technical solutions:

[0024] The percentages by weight of the components in the Al-Cu cast aluminum alloy with excellent thermal cracking resistance and high elongation in this example are: Cu: 5%, Mn: 1.1%, Ti: 0.30%, B: 0.01%, V: 0.01%, the balance is Al.

[0025] The process of the preparation method is as follows: dissolving and refining the raw materials to obtain an alloy solution; pouring the aluminum alloy solution into a mold, and obtaining an alloy casting after cooling; performing solid solution treatment on the obtained alloy casting; aging treatment, and finally carry out cold and hot cycle treatment on the casting after ag...

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Abstract

The invention provides a thermal cracking resistant Al-Cu series cast aluminum alloy and a preparation method thereof. To solve the problem of thermal cracking of Al-Cu series cast aluminum alloys with high copper content, a plurality of strengthening elements and inhibition elements are added, thus the elongation of materials is increased, the solidification temperature interval in the pouring process is reduced, and meanwhile the grain boundary dragging effect is improved. The Al-Cu series cast aluminum alloy comprises the following components in percentage by weight: 4-6% of Cu, 0.7-1.5% ofMn, 0.1-0.4% of Ti, 0.005-0.06% of B, 0.005-0.030% of V, and the balance Al. Through increase of the content ratio of Mn in the Al-Cu series cast aluminum alloy, MnAl16 chemical combination dispersion particles are formed to distribute along the grain boundary to stop growth of recrystallized grains; and meanwhile, iron impurities are molten to form (Fe, Mn) Al16 compounds to reduce harmful influence of iron. The thermal cracking resistance and the elongation of the Al-Cu series cast aluminum alloy are prominently improved.

Description

technical field [0001] The invention relates to a cast alloy, in particular to a thermal cracking-resistant Al-Cu cast aluminum alloy and a preparation method thereof, which improves material performance and expands market application prospects. Background technique [0002] Al-Cu cast aluminum alloy is a typical high-strength and high-toughness alloy with excellent comprehensive mechanical properties. It has high strength, good ductility and plasticity, and excellent high-temperature performance and machinability. It is currently mainly used as a military and Civilian structural materials have great application prospects in aviation, aerospace, and automotive wheel industries. However, since the Al-Cu cast aluminum alloy has a wide crystallization temperature range, and there is Al with poor plasticity in the eutectic structure during solidification 2 Cu phase, easy to crack. At the same time, due to the different solidification speeds of the structural parts during the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12C22F1/057C22C1/03
CPCC22C1/03C22C21/12C22F1/002C22F1/057
Inventor 王军阳冯延泽杨世林
Owner LANZHOU FLIGHT CONTROL
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