Cast aluminum alloy material with high strength and high yield-tensile ratio, and preparation method thereof

A technology for casting aluminum alloys and aluminum alloy materials, which is applied in the field of metal materials, can solve the problems of unsatisfactory structural optimization design, low performance of die castings, and hindering the application of alloys, etc., achieve good self-strengthening characteristics, improve mold life, and reduce heat loss. cracking tendency

Inactive Publication Date: 2018-06-29

潘换珍 +1

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AI-Extracted Technical Summary

Problems solved by technology

Since die castings cannot be strengthened by heat treatment, and there are problems of shrinkage porosity and shrinkage cavities, the performance of die castings is generally not high, and it cannot meet the requirements of further weight reduction through structural optimization design. It is urgent to develop a self-strengthening high performance without heat treatment. Die-casting aluminum alloy materials, which are necessary for the development of automobiles and mobile communications with high lightweight requirements

[0003] At present, there are onl...

Abstract

The invention discloses a cast aluminum alloy material with high strength and a high yield-tensile ratio. The alloy material is prepared from the chemical components in percentage by weight: 13.0 to 19.0 percent of Zn, 8.0 to 13.0 percent of Si, 1.0 to 3.0 percent of Cu, 0.05 to 0.30 percent of Mg, 0.10 to 0.50 percent of Mn, 0.15 to 0.80 percent of Fe, 0.05 to 0.25 percent of Ti, 0.05 to 0.20 percent of RE, and the balance of aluminum and other impurity elements, wherein the content of the other impurity elements is less than or equal to 0.15 percent.

Technology Topic

Aluminium alloyImpurity

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Examples

Experimental program(4)

Example Embodiment

[0026] Example 1:

[0027] According to the ratio of Al-13.1Zn-10.5Si-2.0Cu-0.15Mg-0.2Mn-0.3Fe-0.1Ti-0.06RE as an example, the mass of raw materials required for 15t alloy is calculated and prepared.

[0028] (1) Clean the furnace and prepare raw materials according to the above composition ratio of the alloy.

[0029] (2) Put the aluminum ingot into the furnace and raise the temperature to 750°C. After the aluminum ingot is completely melted, add the prepared metal Si, red copper and electrolytic manganese into the molten aluminum;

[0030] (3) After the metal is completely melted, cool down to 710°C and add the prepared Zn ingot, Mg ingot and Al-Fe master alloy;

[0031] (4) After the metal is completely melted, adjust the temperature of the molten aluminum to 720°C to keep warm, use a refining spoon to press the special refining agent for aluminum alloy into the melt, and stir it up and down fully, or use high-purity inert gas as a carrier to spray the refining agent into the melt Melt, degassing and impurity removal. Remove slag after standing for 5 minutes;

[0032] (5) Add the prepared Al-Ti-B and Al-RE master alloys, stir well and let stand for 10 minutes. Remove slag after standing still.

[0033] (6) Preheat the trough equipped with a 30cm-thick, 30-mesh ceramic filter box, liquid aluminum distribution drum, and chain ingot casting machine mold to 150°C, and start the chain ingot casting machine and aluminum liquid distribution drum, pull out Furnace plug head, start pouring, and produce aluminum alloy ingots with high strength and high yield ratio.

[0034] (7) Test the chemical composition and mechanical properties of the alloy ingot, and observe the metallographic structure of the alloy.

Example Embodiment

[0035] Example 2:

[0036] According to the ratio of Al-14.8Zn-9.5Si-1.6Cu-0.18Mg-0.3Mn-0.4Fe-0.15Ti-0.10RE as an example, calculate the mass of elemental and master alloy required for 15t alloy, and prepare the materials.

[0037] (1) Clean the furnace and prepare raw materials according to the above composition ratio of the alloy.

[0038] (2) Put the aluminum ingot into the furnace and heat up to 760°C. After the aluminum ingot is completely melted, add the prepared Al-Si master alloy, Al-Cu master alloy and Al-Mn master alloy into the molten aluminum;

[0039] (3) After the metal is completely melted, cool down to 720°C and add the prepared Zn ingot, Mg ingot and Al-Fe master alloy;

[0040] (4) After the metal is completely melted, adjust the temperature of the molten aluminum to 720°C to keep warm, use a refining spoon to press the special refining agent for aluminum alloy into the melt, and stir it up and down fully, or use high-purity inert gas as a carrier to spray the refining agent into the melt Melt, degassing and impurity removal. Remove slag after standing for 5 minutes;

[0041] (5) Add the prepared Al-Ti-B and Al-RE master alloys, stir well and let stand for 10 minutes. Remove slag after standing still.

[0042] (6) Preheat the trough equipped with a 30cm-thick, 30-mesh ceramic filter box, liquid aluminum distribution drum, and chain ingot casting machine mold to 150°C, and start the chain ingot casting machine and aluminum liquid distribution drum, pull out Furnace plug head, start pouring, and produce aluminum alloy ingots with high strength and high yield ratio.

[0043] (7) Test the chemical composition and mechanical properties of the alloy ingot.

Example Embodiment

[0044] Example 3:

[0045] According to the ratio of Al-16.60Zn-11.0Si-2.9Cu-0.25Mg-0.36Mn-0.6Fe-0.18Ti-0.15RE as an example, the mass of raw materials required for 15t alloy is calculated and prepared.

[0046] (1) Clean the furnace and prepare raw materials according to the above composition ratio of the alloy.

[0047] (2) Put the aluminum ingot into the furnace and raise the temperature to 780°C. After the aluminum ingot is completely melted, add the prepared metal Si, Al-Cu master alloy and electrolytic manganese into the molten aluminum;

[0048] (3) After the metal is completely melted, cool down to 720°C and add the prepared Zn ingot, Mg ingot and Al-Fe master alloy;

[0049] (4) After the metal is completely melted, adjust the temperature of the molten aluminum to 730°C to keep warm, use a refining spoon to press the special refining agent for aluminum alloy into the melt, and stir it up and down fully, or use high-purity inert gas as a carrier to spray the refining agent into the melt Melt, degassing and impurity removal. Remove slag after standing for 5 minutes;

[0050] (5) Add the prepared Al-Ti-B and Al-RE master alloys, stir well and let stand for 10 minutes. Remove slag after standing still.

[0051] (6) Preheat the trough equipped with a 30cm-thick, 30-mesh ceramic filter box, liquid aluminum distribution drum, and chain ingot casting machine mold to 150°C, and start the chain ingot casting machine and aluminum liquid distribution drum, pull out Furnace plug head, start pouring, and produce aluminum alloy ingots with high strength and high yield ratio.

[0052] (7) Test the chemical composition and mechanical properties of the alloy ingot.

PUM

Property	Measurement	Unit
Tensile strength	320.0 ~ 400.0	mPa
Yield strength	280.0 ~ 360.0	mPa
Hardness	130.0 ~ 170.0

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve alloy strength

Cast aluminum alloy material with high strength and high yield-tensile ratio, and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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