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A kind of high toughness die-casting aluminum alloy and preparation method thereof

A casting aluminum alloy, high toughness technology, applied in the field of metal materials, can solve the problems of elongation and strength not meeting the requirements, elongation is not high elongation, casting deformation, etc., to improve tensile strength and elongation, strength and The effect of elongation improvement and fine alloy structure

Active Publication Date: 2018-05-25
苏州慧驰轻合金精密成型科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For structural parts, especially the chassis and body, the replacement of high structural parts with high strength and plasticity has high requirements for the strength and plasticity of castings, but the elongation and strength of conventional AD12 alloys cannot meet the requirements, and the main problems are as follows: 1. ) The strength of the casting is not high; 2) The elongation is not high. The elongation is only 2.5. The current performance of AD12 is far from meeting the requirements of the automotive structural parts for an elongation of more than 6%, especially for new energy vehicles, which require higher casting strength.
The relatively mature foreign alloy is the German brand SF36 alloy, but this alloy needs T7 treatment to exert better performance. For large and complex thin-walled parts die-casting, T7 treatment will cause casting deformation, affect the size of the casting and increase difficulties and difficulties in subsequent processing. cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0033] Taking 25kg as an example, according to the ratio of Al-10Si-0.1Cu-0.2Mn-0.1Ce as an example, calculate the quality of the master alloy and prepare the material.

[0034] 1) Prepare raw materials and clean the furnace. The furnace needs to be cleaned to avoid residual alloys affecting the performance of the alloy. Now prepare materials according to the alloy composition ratio. Alloy elements can be added in the form of pure alloys and master alloys. Si elements can be added as simple substances or Al-Si master alloys. Cu elements can be added as Al-Cu master alloys. Mn elements can be added as Al-Mn master alloys. The alloy is added, and the Ce element is added as an Al-Ce master alloy.

[0035]2) Melting aluminum ingot: After the surface of the aluminum ingot is cleaned, put the pure aluminum ingot into the crucible of the pit furnace, heat the crucible for melting, and control the temperature of the molten aluminum between 690-700°C.

[0036] 3) Add the master alloy:...

Embodiment example 2

[0043] Taking 25kg as an example, according to the ratio of Al-10Si-0.2Cu-0.2Mn-0.1Ce as an example, calculate the quality of the master alloy and prepare the material.

[0044] 1) Prepare raw materials and clean the furnace. The furnace needs to be cleaned to avoid residual alloys affecting the performance of the alloy. Now prepare materials according to the alloy composition ratio. Alloy elements can be added in the form of pure alloys and master alloys. Si elements can be added as simple substances or Al-Si master alloys. Cu elements can be added as Al-Cu master alloys. Mn elements can be added as Al-Mn master alloys. The alloy is added, and the Ce element is added as an Al-Ce master alloy.

[0045] 2) Melting aluminum ingot: After the surface of the aluminum ingot is cleaned, put the pure aluminum ingot into the crucible of the pit furnace, heat the crucible for melting, and control the temperature of the molten aluminum between 690-700°C.

[0046] 3) Add the master alloy...

Embodiment example 3

[0053] Taking 25kg as an example, according to the proportion of Al-10Si-0.3Cu-0.2Mn-0.1Ce as an example, calculate the quality of the master alloy and prepare the material.

[0054] 1) Prepare raw materials and clean the furnace. The furnace needs to be cleaned to avoid residual alloys affecting the performance of the alloy. Now prepare materials according to the alloy composition ratio. Alloy elements can be added in the form of pure alloys and master alloys. Si elements can be added as simple substances or Al-Si master alloys. Cu elements can be added as Al-Cu master alloys. Mn elements can be added as Al-Mn master alloys. The alloy is added, and the Ce element is added as an Al-Ce master alloy.

[0055] 2) Melting aluminum ingot: After the surface of the aluminum ingot is cleaned, put the pure aluminum ingot into the crucible of the pit furnace, heat the crucible for melting, and control the temperature of the molten aluminum between 690-700°C.

[0056] 3) Add the master ...

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Abstract

The invention belongs to the field of metal materials and particularly relates to high-toughness die-casting aluminum alloy and a preparation method thereof. The high-toughness die-casting aluminum alloy is composed of, by weight, 9-10% of Si, 0.1-0.3% of Cu. 0.2-0.3% of Mn, 0.1-0.3% of Ce, and the balance Al and other impurity elements, specifically, the content of other impurity elements is smaller than 0.005%. According to the high-toughness die-casting aluminum alloy and the preparation method thereof, the problem that existing AD12 aluminum alloy can hardly meet the requirement that the elongation percentage of automotive structural parts reaches 6% or over is solved. According to the high-toughness die-casting aluminum alloy, the strength and elongation percentage are remarkably improved, specifically, the tensile strength reaches 322.3 MPa and is increased by 28.9% compared with the tensile strength (250 MPa specifically) of the existing AD12 aluminum alloy, and the elongation percentage is 9.7% and is increased by 300% compared with that of the existing AD12 aluminum alloy. The high-toughness die-casting aluminum alloy completely meets the requirements that the tensile strength of the structural parts is 250 MPa and the elongation percentage of the structural parts is 6% in the automobile industry and the communication industry.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-toughness die-casting aluminum alloy and a preparation method thereof. Background technique [0002] With the development of lightweight in the automotive and communication industries, new materials and new processes for automotive lightweight will be the future demand. Lightweight new materials are the main means of lightweighting, and safety is the premise of lightweighting. While people are optimizing the traditional structure, they also put forward higher requirements for the performance of aluminum alloy materials, not only requiring aluminum alloys to have Higher strength and good plasticity are required. Therefore, it is very necessary to develop a high-toughness die-casting aluminum alloy material for the lightweight development of the automobile and communication industries. [0003] In the automotive and machinery industries, with the advancement of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/02C22F1/043
Inventor 汪时宜周银鹏李德江罗云斌赵华曾小勤
Owner 苏州慧驰轻合金精密成型科技有限公司