High-toughness ultrathin die-cast aluminum lithium alloy

Abstract

The invention discloses a high-toughness ultrathin die-cast aluminum lithium alloy which comprises the following components in percentage by weight: 1-3% of zinc, 5-7% of silicon, 0.3-3% of copper, 0.1-10% of magnesium, 0.1-0.5% of lithium, 0.3-0.6% of strontium, 0.1-0.3% of lanthanum, 0.1-0.3% of cerium and the balance of aluminum. The high-toughness ultrathin die-cast aluminum lithium alloy disclosed by the invention has the advantages of better fatigue resistance, crack growth resistance, corrosion resistance and heat resistance.

Description

technical field [0001] The invention relates to a die-casting aluminum-lithium alloy, in particular to a high-toughness ultra-thin die-casting aluminum-lithium alloy. Background technique [0002] Today's die-casting aluminum alloy technology is quite mature, but due to the simple geometry and low mechanical properties of die-casting aluminum alloy, the application range is limited to a certain extent. In order to meet the needs of large-scale production of general decorative parts with certain mechanical properties and good corrosion resistance, my country urgently needs high-toughness ultra-thin die-cast aluminum-lithium alloys. [0003] Chinese patent document CN1062176A discloses a high-performance rare-earth aluminum-lithium alloy. In order to solve the problems of existing aluminum-lithium alloys such as low fatigue crack-free life, fast growth rate of short cracks, and poor corrosion resistance, this alloy provides A kind of Al-Li-Cu-Zr-Ce (or La) rare earth alum...

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Problems solved by technology

[0003] Chinese patent document CN1062176A discloses a high-performance rare earth aluminum-lithium alloy, which solves the fatigue-free life of existing aluminum-lithium alloys with low crack-free life and short cracks Expansion rate is fast, corrosion resistance is poor, and a rare earth aluminum-lithium alloy of Al-Li-Cu-Zr-Ce (or La) is provided. This aluminum-lithium alloy, in actual use, if used as a plate Using it, its fatigue crack-free life has been improved, and the short crack growth rate has been reduced. However, it is used as a die-casting material, but it does not perform very well in these two aspects.

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