Al-Si-Mg-Er rare earth casting aluminium alloy

An al-si-mg-er, casting aluminum alloy technology, applied in the field of metal alloys, can solve the problems that the mechanical properties research has not been reported yet, and the modification effect of rare earth element Er has not been studied, and achieves comprehensive performance improvement, tensile strength. and the effect of increasing yield strength

Inactive Publication Date: 2010-05-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no one has studied the modification of rare earth element Er, espe

Method used

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  • Al-Si-Mg-Er rare earth casting aluminium alloy
  • Al-Si-Mg-Er rare earth casting aluminium alloy
  • Al-Si-Mg-Er rare earth casting aluminium alloy

Examples

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Example Embodiment

[0014] Example 1: Using conventional gravity casting to prepare Al-Si-Mg-Er alloy, the raw materials used are high-purity Al (purity 99.99%), industrial pure Mg (purity 99.9%), Al-12% Si master alloy and Al-6% Er master alloy. First, 631.7g of high-purity aluminum and 838.4g of Al-12%Si master alloy were added to a graphite clay crucible, and the alloy was smelted in a resistance furnace at a melting temperature of 750°C. After the metal is completely melted, use a bell jar to press 6.4g of pure Mg into the molten metal. Use C for the alloy at 720℃. 2 Cl 6 Degassing and refining. After standing for 20 minutes, the temperature was increased to 750°C and 25g Al-6% Er master alloy was added. After standing, it was poured into an iron mold to obtain an Al-7%Si-0.4%Mg-0.1%Er alloy ingot, and the pouring temperature was 720°C.

Example Embodiment

[0015] Example 2: Using conventional gravity casting to prepare Al-Si-Mg-Er alloy, the raw materials used are high-purity Al (purity 99.99%), industrial pure Mg (purity 99.9%), Al-12%Si master alloy and Al-6% Er master alloy. First, 581.7g of high-purity aluminum and 838.4g of Al-12%Si master alloy were added to a graphite clay crucible, and the alloy was smelted in a resistance furnace at a melting temperature of 750°C. After the metal is completely melted, use a bell jar to press 6.4g of pure Mg into the molten metal. Use C for the alloy at 720℃. 2 Cl 6 Degassing and refining. After standing for 20 minutes, the temperature was increased to 750° C. and 75 g of Al-6% Er master alloy was added. After standing, it was poured into an iron mold to obtain an Al-7%Si-0.4%Mg-0.3%Er alloy ingot, and the pouring temperature was 720°C.

Example Embodiment

[0016] Example 3: Using conventional gravity casting to prepare Al-Si-Mg-Er alloy, the raw materials used are high-purity Al (purity of 99.99%), industrial pure Mg (purity of 99.9%), Al-12% Si master alloy and Al-6% Er master alloy. First, 531.7g of high-purity aluminum and 838.4g of Al-12%Si master alloy were added to a graphite clay crucible, and the alloy was smelted in a resistance furnace at a melting temperature of 750°C. After the metal is completely melted, use a bell jar to press 6.4g of pure Mg into the molten metal. Use C for the alloy at 720℃. 2 Cl 6 Degassing and refining. After standing for 20 minutes, the temperature was increased to 750° C. and 125 g Al-6% Er master alloy was added. After standing, it was poured into an iron mold to obtain an Al-7%Si-0.4%Mg-0.5%Er alloy ingot, and the pouring temperature was 720°C.

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Abstract

The invention belongs to the technical field of metal alloy, and provides Al-Si-Mg-Er rare earth casting aluminium alloy which is characterized in that rare earth Er element accounting for 0.1-0.8% of the weight percent of final product is added into ZL101 alloy matrix. The ZL101 alloy comprises the following components by weight percent: 6.5-7.5 percent of Si, 0.25-0.45 percent of Mg and the balance of Al. As trace rare earth Er element is added, primary a-Al phase is thinned, eutectic silicon phase is changed into tiny coral shape from thick needle piece shape, the combination property of the alloy can be improved, the tensile strength and the yield strength are slightly enhanced compared with those of the alloy which has the original components and is not added with Er, and the elongation is 2 times higher than that thereof.

Description

technical field [0001] The invention belongs to the technical field of metal alloys. Background technique [0002] Aluminum-silicon cast aluminum alloy has good liquid fluidity, corrosion resistance, good weldability, low shrinkage and low thermal expansion coefficient, and is the most widely used cast aluminum alloy. Hypoeutectic aluminum-silicon alloy ZL101 (GB / T 1173-1995) is widely used in the automotive industry and aerospace manufacturing. The main function of adding Si to the cast aluminum-silicon alloy is to improve the fluidity of the alloy, reduce the tendency of thermal cracking, reduce porosity, and improve air tightness. The main function of adding a small amount of Mg is to form a strengthening phase Mg with Si. 2 Si increases the strength of the alloy. The eutectic silicon phase of the Al-Si alloy without modification treatment is in the shape of coarse needle flakes. The silicon phase splits the matrix and reduces the strength and plasticity of the alloy. ...

Claims

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Application Information

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IPC IPC(8): C22C21/02
Inventor 聂祚仁郑学斌苏学宽
Owner BEIJING UNIV OF TECH
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