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Method for modifying rare earth Y to AlSi7Mg alloy

An alloy and rare earth technology, applied in the field of metamorphic aluminum-silicon alloy, can solve problems such as AlSi7Mg alloy pore defects, and achieve the effect of improving mechanical properties, improving shape, and easy control of composition

Inactive Publication Date: 2011-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for modifying AlSi7Mg alloy with rare earth Y, obtains AlSi7Mg alloy with good tensile strength and elongation, and solves the problem of pore defects in AlSi7Mg alloy obtained by using modifier Sr

Method used

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  • Method for modifying rare earth Y to AlSi7Mg alloy
  • Method for modifying rare earth Y to AlSi7Mg alloy
  • Method for modifying rare earth Y to AlSi7Mg alloy

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specific Embodiment approach 1

[0015] Specific embodiment 1: The method for modifying AlSi7Mg alloy by rare earth Y in this embodiment is realized through the following steps: 1. Weigh 34.05% to 45.05% of high-purity aluminum with a mass purity of 99.99%, 54.2% to 62.5% by weight percentage Al-12Si master alloy, 0.25%~0.45% mass purity of 99.99% high-purity magnesium and 0.5%~3% Al-10Y master alloy; 2. The high-purity aluminum and Al-12Si master alloy taken in step 1 After cleaning and drying, put it into a crucible resistance furnace with a power of 7.5kW, heat it until it is completely melted, and control the temperature of the melt at 720°C to 730°C; 3. Use a graphite bell jar with a temperature of 300°C to press the high-purity magnesium weighed in step 1 Put it into the melt obtained in step 2, keep it warm for 10-20min, and obtain the AlSi7Mg alloy melt, wherein the graphite bell jar is preheated at 300°C for 10-30min before use; 4. Rotate the AlSi7Mg alloy melt in step 3 After refining treatment by b...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that the volume purity of the high-purity argon gas in Step 4 is not less than 99.999%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, 36.55% to 42% of high-purity aluminum with a mass purity of 99.99%, 56% to 60.6% of Al- 12Si master alloy, 0.35%~0.42% high-purity magnesium with a mass purity of 99.99%, and 1.5%~2.5% Al-10Y master alloy. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for a rare earth Y modified AlSi7Mg alloy, and relates to a method for modified alpax. The invention solves the problem that the AlSi7Mg alloy obtained by adopting a modificator has air hole defects. The method comprises the following steps of: weighing raw materials of high-purity aluminium, an Al-12Si intermediate alloy, high-purity magnesium and a Al-10Y intermediate alloy; melting the high-purity aluminium and the Al-12Si intermediate alloy, pressing the high-purity magnesium, and melting to obtain a melt; and adding the Al-10Y intermediate alloy into the melt, melting and casting. The method is simple, and is suitable for mass production. The obtained Y modified AlSi7Mg alloy does not have air holes, and has the tensile strength of 246MPa and the elongation of 5.6 percent; the Y modified AlSi7Mg alloy subjected to T6 heat treatment has the tensile strength of 351MPa and the elongation of 11.8 percent; and the comprehensive mechanical properties ofthe Y modified AlSi7Mg alloy are equivalent to a Sr modified AlSi7Mg alloy.

Description

technical field [0001] The invention relates to a method for modifying aluminum-silicon alloy. Background technique [0002] Hypoeutectic aluminum-silicon alloy has low density, good casting performance, high mechanical properties, and can cast high-strength castings with complex shapes. It is widely used in automobile, aerospace and other industries. For the unmodified aluminum-silicon alloy, the eutectic silicon phase has a coarse flake or massive structure and is relatively brittle, causing stress concentration at the tip and corners of the Si phase, where early cracks are easy to occur, and the mechanical properties are especially The plasticity is significantly reduced. [0003] At present, in the process of industrial production, Al-Si alloys will be modified to change the shape of eutectic silicon, from thick flakes or needles to fibrous, to improve the mechanical properties of the alloy, especially the elongation, and at the same time, the modification has a negativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03
Inventor 李豹王宏伟邹鹑鸣朱兆军魏尊杰
Owner HARBIN INST OF TECH
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