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Al-Si-Cu-Mg cast aluminum alloy and preparation method thereof

An al-si-cu-mg, casting aluminum alloy technology, applied in the field of Al-Si-Cu-Mg series casting aluminum alloy and its preparation, to achieve the effect of accurate element content control value and reliable operation process parameters

Inactive Publication Date: 2014-10-01
QUZHOU COLLEGE OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of detailed test methods and data to confirm the production methods and material properties of cast aluminum alloys. Therefore, more reliable research is needed to guide production practices

Method used

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  • Al-Si-Cu-Mg cast aluminum alloy and preparation method thereof
  • Al-Si-Cu-Mg cast aluminum alloy and preparation method thereof
  • Al-Si-Cu-Mg cast aluminum alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: it is a kind of cast aluminum alloy and its preparation process, comprising the following steps:

[0029] A: Preparation for smelting. Preheat the crucible to above 200°C and turn dark red. Preheat the charge before loading the furnace. To 200°C-300°C, spray or brush 2-3 coats of paint on all surfaces in contact with molten aluminum, then dry for later use;

[0030] B: During the smelting process, use thermocouples and potentiometers to measure and control the temperature. When the temperature of the alloy melt is 700°C, after the alloy melt is degassed and refined, the alloy liquid is measured for hydrogen, and the hydrogen content is controlled at 0.10. Below ml / 100gAl; aluminum-silicon alloy (Shenyang Institute of Aerospace Metal Materials); b1-first put 2 / 3 of pure aluminum (Xinjiang Zhonghe Co., Ltd.), the aluminum content is not less than 99.99%; and medium-sized blocks Shaped aluminum-silicon master alloy (Shenyang Aerospace Metal Materials Resear...

Embodiment 2

[0037] Embodiment 2: Its preparation procedure is the same as embodiment 1, only has difference on the addition of master alloy and operating parameter. The composition of the Al-Si-Cu-Mg cast aluminum alloy is as follows: the composition includes 89.5wt% aluminum Al, the balance includes 7.5wt% silicon Si and 0.04wt% modificator strontium Sr, the addition amount of Sr 0.04wt%, let it stand for 50 minutes, and the temperature of the molten aluminum was 750°C when it was added; the copper Cu content in the alloy was 1.5wt%, the magnesium Mg content was 0.45wt%, and 0.15wt% zirconium Zr and 0.1wt% Cadmium Cd. The content ratio of Cu and Mg is maintained at 1-3, and the content of trace elements titanium Ti is 0.3wt%, manganese Mn content is 0.2wt%, and the molar ratio of boron B to titanium Ti is 1:5. The mass fraction of the elements A: Zr (%), B: Cd (%), C: Cu (%), D: Mg (%) is A3B3C1D3. After alloying and electromagnetic pump low-pressure casting at the beginning, the pouri...

Embodiment 3

[0038] Example 3, the preparation steps are the same as before, and the addition amount and operating parameters of the master alloy are changed according to the orthogonal test method. The composition of the Al-Si-Cu-Mg series cast aluminum alloy is: Si 7%, Ti 0.12%, Mn0.16%, Sr0.04%, 0.15%Zr, 0.5%Cd, 1.5%Cu, 0.35%Mg. The molar ratio of boron B to titanium Ti is 1:5. The content ratios of the elements Zr:Cd:Cu:Mg are 5:10:50:13 respectively. . Calculate the ingredients according to the composition of the above alloy, prepare raw materials and tools, and smelt the alloy. The amount of Sr added is 0.04wt%, and it is left to stand for 60 minutes. The temperature of the molten aluminum is 750°C when it is added; The same heat treatment process (T6, 540 ° C solution temperature + 170 ° C aging temperature), and prepare standard tensile samples. The pouring temperature is controlled at 720°C. After melt treatment and heat treatment, its mechanical properties are: σb reaches 351M...

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Abstract

The invention relates to metal smelting technology and particularly relates to a Al-Si-Cu-Mg cast aluminum alloy and a preparation method thereof. The cast aluminum alloy comprises 89.5-90.5wt% of aluminum (Al) and the balance of 6.5-7.5wt% of silicon (Si) and 0.02-0.04wt% of modificator strontium (Sr), wherein according to the alloy, the content of copper (Cu) is 1.5-2.5wt%, the content of magnesium (Mg) is 0.35-0.65wt% and 0.05-0.25wt% of zirconium (Zr) and 0.1-0. 5wt% of cadmium (Cd) are both added into the alloy. The preparation method comprises the steps of smelting, refining, carrying out modification treatment, adding 0.04wt% of Sr, standing for 40-60 minutes, carrying out low pressure casting by using an electromagnetic pump and carrying out T6 heat treatment on castings to obtain the corresponding castings. Since more accurate element content control values and reliable operation process parameters are provided by the scheme, the high-performance cast aluminum alloy, especially suitable for the automotive industry can be prepared based on the optimized configuration of trace elements in AlSi7Cu2Mg.

Description

technical field [0001] The invention relates to metal smelting technology, in particular to an Al-Si-Cu-Mg series cast aluminum alloy and a preparation method thereof. Background technique [0002] Cast aluminum alloys have developed from the primary aluminum-zinc alloys in the 1870s and 1880s to the current aluminum-copper, aluminum-silicon, aluminum-magnesium, aluminum rare earth and aluminum-lithium alloys, among which Al-Si alloys and aluminum alloys are more researched and applied. Al-Cu alloy. As a traditional metal material, cast aluminum alloy is widely used in aviation, aerospace, automobile, machinery and other industries due to its low density and high specific strength. Especially with the rapid development of my country's economic construction, it has driven the rapid development of modern industry. Automobiles, motorcycles, electrical appliances, electronics, machinery, etc. have become the pillar industries of the national economy. The rapid development of th...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
Inventor 王宇星
Owner QUZHOU COLLEGE OF TECH
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