Die cast magnesium alloy with heat cracking resistance and high fluidity

A high-fluidity, thermal-crack-resistant technology, applied in the field of metal materials, can solve problems such as reduced fluidity, mold release of castings, reduced yield of air-tightness, poor shrinkage, etc.

Active Publication Date: 2011-05-18
KA SHUI TECH HUIZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existence of these impurities has become the source of the main defects of Mg-Al alloys-shrinkage porosity and thermal cracking, which inc

Method used

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  • Die cast magnesium alloy with heat cracking resistance and high fluidity
  • Die cast magnesium alloy with heat cracking resistance and high fluidity

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1 (test number 1):

[0021] Commercially available AZ91D alloy [currently the most commonly used commercial magnesium alloy, it is the name of the grade in ASTM in the United States, wherein A represents metal aluminum Al, Z represents metal zinc Zn, 9 represents that the content of aluminum is approximately 9%, 1 It means that the content of zinc is approximately 1%, and D refers to diecasting alloy, among which the brand name in the corresponding national standard in China is YZMgAl9Zn1(D)] 800 kg is put into a smelting iron crucible heated by gas, and the temperature is raised under the protection of argon Melting; Stir for 15 minutes at 700°C, remove the slag, and let stand for 30 minutes. Using a mold (the mold can simultaneously obtain a standard test rod and measure the length of the alloy flowing in the spiral tube), die-cast in a hot chamber die-casting machine at 640 ° C, and take 10 die-casting samples to evaluate the die-casting performance, appea...

Embodiment 2

[0022] Embodiment 2 (test number 2):

[0023] On the basis of Example 1, AZ91D is used to heat the alloy to 750°C and add Mg-Cet and Mg-La master alloys. The amount of Ce added accounts for 0.3% (mass percentage) of the total amount of the alloy, and the amount of La added accounts for the total amount of the alloy. The casting performance of 0.2% (mass percentage) is significantly improved (see Table 1), and the spiral flow length is increased by about 30% compared with AZ91D.

Embodiment 3

[0024] Embodiment 3 (test number 3):

[0025] The experimental conditions and process are basically the same as in Example 2, except that in addition to adding Ce0.3%, La0.2%, and adding Y0.08%, (Gd+Ho)0.02%, the casting performance has been greatly improved .

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Abstract

The invention provides a die cast magnesium alloy with heat cracking resistance and high fluidity, which comprises magnesium, aluminum and zinc and further comprise the following components in percentage by weight: 0.1-0.5% of cerium, 0.1-0.5% of lanthanum, 0.1-0.5% of yttrium, 0.01-0.2% of gadolinium, 0.01-0.3% of holmium, 0.01-0.5% of strontium, or/and 0.1-0.8% of calcium. The die cast magnesium alloy with heat cracking resistance and high fluidity has higher casting property.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a hot-cracking-resistant high-fluidity die-casting magnesium alloy. Background technique [0002] Magnesium alloys (called Mg-Al-Zn series die-casting alloys) are the most important alloys used in industrial magnesium alloys. Magnesium alloy has the advantages of light weight, shock absorption and noise reduction, anti-electromagnetic radiation, good thermal conductivity, and no environmental pollution caused by recycling, especially rich in magnesium resources (while steel, aluminum, and copper resources are increasingly depleted), known as the 21st century. Lightweight green construction material. Magnesium is the main element in magnesium alloys (usually accounting for 90% by mass). Due to the active chemical properties of magnesium, it is easy to generate magnesium oxide and magnesium oxide inclusions; the solubility of hydrogen in magnesium alloys is two orders of m...

Claims

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Application Information

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IPC IPC(8): C22C23/00
Inventor 单巍巍李远发唐定骧
Owner KA SHUI TECH HUIZHOU CO LTD
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