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High-elongation-rate heat-resistant aluminum alloy suitable for gravity casting and preparation method thereof

A high-elongation, gravity casting technology, applied in the field of industrial aluminum alloys and manufacturing, can solve the problems of application limitations, elongation, heat resistance, etc., and achieve the requirements of reducing inclusions, improving recycling rate, and low impurity content Effect

Active Publication Date: 2019-07-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the industrial problem that the existing cast aluminum alloys such as A380 have insufficient elongation and heat resistance, which greatly restricts their application, the present invention provides a high elongation and heat-resistant cast aluminum alloy and its preparation method , to solve the above problem

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  • High-elongation-rate heat-resistant aluminum alloy suitable for gravity casting and preparation method thereof

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Embodiment 1

[0038] The weight percentage of a high elongation heat-resistant aluminum alloy suitable for gravity casting is: according to the theoretical ratio, 9.0% Si, 0.05% Cu, 0.05% Mg, 0.05% Sc, 0.3% Zr, 0.3% V, the remainder For Al and inevitable impurity Fe.

[0039] The preparation method is: (1) removing the oxide layer from industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si intermediate alloy AlSi23, drying and preheating to 200 DEG C; calculating the required raw materials according to the composition of the alloy and the stoichiometric ratio. (2) After melting the industrial pure aluminum ingots accounting for 25% of the crucible height into a molten pool at 710 ° C, add the remaining aluminum ingots; (3) After all the aluminum ingots are melted, the temperature is raised to 720 ° C, and the Al- The Si master alloy is added in two times, and the temperature is kept constant at 720 °C; (4) After the Al-Si master alloy is completely melted, the temperature...

Embodiment 2

[0042] The weight percentage of a high elongation heat-resistant aluminum alloy suitable for gravity casting is: according to the theoretical ratio, 11.0% Si, 0.4% Cu, 0.02% Mg, 0.1% Sc, 0.3% Zr, 0.3% Ti, the remainder For Al and inevitable impurity Fe.

[0043] The preparation method is: (1) removing the oxide layer from industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si intermediate alloy AlSi23, drying and preheating to 200 DEG C; calculating the required raw materials according to the composition of the alloy and the stoichiometric ratio. (2) After melting the industrial pure aluminum ingots that account for 25% of the crucible height into a molten pool at 720 ° C, add the remaining aluminum ingots; The Si master alloy is added in 4 times, and the temperature is kept constant at 720°C; (4) After the Al-Si master alloy is completely melted, the temperature is raised to 770°C, and AlCu50, AlZr4 master alloy, AlTi5B1 master alloy, and AlSc2 master alloy...

Embodiment 3

[0046] The weight percentage of a high elongation heat-resistant aluminum alloy suitable for gravity casting is: according to the theoretical ratio, 11.0% Si, 0.2% Cu, 0.04% Mg, 0.05% Sc, 0.1% Zr, 0.3% Ti, 0.3% V, the balance is Al and inevitable impurity Fe.

[0047]The preparation method is: (1) removing the oxide layer from industrial pure aluminum ingot, industrial pure magnesium ingot and Al-Si intermediate alloy AlSi28, drying and preheating to 200 DEG C; calculating the required raw materials according to the composition and stoichiometric ratio of the alloy (2) After melting the industrial pure aluminum ingots accounting for 25% of the crucible height into a molten pool at 715 ° C, add the remaining aluminum ingots; The Si master alloy is added in 3 times, and the temperature is kept constant at 720°C; (4) after the Al-Si master alloy is completely melted, the temperature is raised to 770°C, and AlCu50, AlTi5B1, AlTi10 master alloy, AlV5 master alloy, AlZr4 master all...

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Abstract

The invention provides a high-elongation-rate heat-resistant aluminum alloy suitable for gravity casting and a preparation method thereof. The alloy comprises the following elements of, by weight, 9.0-12.0% of Si, 0.05-0.4% of Cu, 0.02-0.05% of Mg, 0.05-0.1% of Sc, 0.6-0.8% of M and and the balance Al and inevitable Fe impurities, wherein the M comprises at least two elements of Ti, Zr and V. After gravity casting of the high-elongation-rate heat-resistant aluminum alloy suitable for gravity casting, room-temperature yield strength of the as-cast alloy can reach 143-152MPa, the elongation ratecan reach 8.0%-12.0%, high-temperature tensile strength at 200 DEG C can reach 158-170MPa, the high-temperature elongation rate can reach 10.0%-20.0%, the room-temperature yield strength and heat resistance are excellent, the alloy can be applied to automobile parts without solid solution heat treatment, so that the requirements of light-weight development of automobiles can be met.

Description

technical field [0001] The invention relates to a high elongation heat-resistant aluminum alloy suitable for gravity casting and a preparation method thereof, and belongs to the field of industrial aluminum alloy and manufacturing. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength and specific stiffness, good corrosion resistance, excellent electrical and thermal conductivity, easy recycling, and good low temperature performance. It is widely used in transportation, aerospace, electronic appliances and other fields. Gravity casting refers to the casting method in which molten metal is injected into the mold under the action of the earth's gravity, including sand casting, investment casting, metal mold casting, etc. Compared with the currently commonly used alloy die casting process, the investment cost of gravity casting is greatly reduced, and it is the main method for producing castings with complex geometric shapes...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/02
Inventor 叶兵张澍蒋海燕
Owner SHANGHAI JIAO TONG UNIV
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