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Heat resisting casting magnesium alloy and preparation method thereof

A technology for casting magnesium alloys and magnesium alloys, applied in the field of magnesium alloys and their preparation, can solve the problems of affecting the casting properties of the alloys, reducing the fluidity of the alloys, low tensile strength, etc. Strength, low cost effect

Inactive Publication Date: 2009-03-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are: on the one hand, there are too many types of alloying elements added, and the process is more complicated; on the other hand, the tensile strength of the alloy at room temperature and high temperature is low
In addition, in the current research on Mg-Y-Zn-Zr quaternary alloys, the content of Y is generally relatively high, and there are obvious shortcomings: on the one hand, the content of Y is high, and the cost is high; on the other hand, the content of Y in the alloy is relatively high. The high content of the alloy obviously reduces the fluidity of the alloy and affects the casting performance of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] The composition (percentage by weight) of the alloy is: 1.5% Y, 1.5% Zn, 0.7% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The melting process of the alloy is as follows: configure the alloy according to the above ingredients, add 172Kg of industrial pure magnesium into the resistance crucible boiler, and use CO 2 +0.2% SF 6 Mixed gas protection, after the magnesium is completely melted, add 3Kg of industrial pure zinc at 660°C, add 17.1Kg of Mg-25Y master alloy at 720°C, add 15.5Kg of Mg-30Zr master alloy at 760°C, and keep warm for 2 to 3 minutes Stir, heat up to 780°C and hold at this temperature for 10 minutes, then lower the temperature to 750-760°C for refining, then hold for about 30 minutes, cool down to 740°C for gravity casting or die casting at 705°C or 700°C Squeeze casting.

[0019] In this example, the room temperature tensile strength of the alloy under the gravity pouring condition is 205MPa, the yield strength is 93MPa,...

example 2

[0021] The composition (percentage by weight) of the alloy is: 3% Y, 0.8% Zn, 0.45% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The melting process of the alloy is as follows: configure the alloy according to the above ingredients, add 160Kg of industrial pure magnesium into the resistance crucible boiler, and use CO 2 +0.2% SF 6 Mixed gas protection, after the magnesium is completely melted, add 1.4Kg of industrial pure zinc, 33.8Kg of Mg—25Y master alloy at 660°C, add 10Kg of Mg—30Zr master alloy at 760°C, keep warm for 2 to 3 minutes, stir, and heat up to 780°C ℃ and keep it at this temperature for 10 minutes, then lower the temperature to 750-760 ℃ for refining, then keep it for about 30 minutes, then cool down to 730 ℃ for gravity casting or 705 ℃ for die casting or 700 ℃ for squeeze casting.

[0022] The room temperature tensile strength of the alloy under gravity pouring conditions in this example is 208MPa, the yield strength is 96MPa,...

example 3

[0024] The composition (percentage by weight) of the alloy is: 4.5% Y, 0.4% Zn, 0.2% Zr, the content of impurity elements is less than 0.02%, and the rest is Mg. The melting process of the alloy is as follows: configure the alloy according to the above ingredients, add 146Kg of industrial pure magnesium into the resistance crucible boiler, and use CO 2 +0.2% SF 6 Mixed gas protection, after the magnesium is completely melted, add 0.8Kg of industrial pure zinc, 51.3Kg of Mg—25Y master alloy at 660°C, add 5Kg of Mg—30Zr master alloy at 760°C, keep warm for 2 to 3 minutes, stir, and heat up to 780°C ℃ and hold at this temperature for 10 minutes, then lower the temperature to 750-760°C for refining, then hold for about 30 minutes, cool down to 720°C for gravity casting or cool down to 705°C for die-casting or squeeze casting at 700°C .

[0025]The room temperature tensile strength of the alloy under gravity pouring conditions in this example is 209MPa, the yield strength is 98MP...

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Abstract

The invention provides a heat-resistant cast magnesium alloy, which belongs to the technical field of metal material and comprises the following compositions in percentage by weight: 1.5 to 4.5 percent of yttrium, 0.4 to 1.5 percent of zinc, 0.2 to 0.7 percent of zirconium, impurity elements: less than 0.005 percent of ferrite, less than 0.015 percent of copper and less than 0.002 percent of nickel and the balance of magnesium. The heat-resistant cast magnesium alloy is low in cost and high in efficiency, has good tensile strength, yield strength and elongation, and meanwhile has perfect creep resistance property and good casting property.

Description

technical field [0001] The invention relates to a magnesium alloy in the technical field of metal materials and a preparation method thereof, in particular to a heat-resistant cast magnesium alloy. Background technique [0002] At present, lightweight has gradually become the development direction of modern automobiles, and magnesium alloys, as the most promising light alloys, will be more widely used in the automobile industry. At present, the magnesium alloy parts in automobiles are basically die-casting parts. Among the existing cast magnesium alloys, AZ91D, AM50 and other alloys are most widely used. These magnesium alloys have excellent mechanical properties, corrosion resistance and die-casting properties. However, when the operating temperature exceeds 120°C, the creep properties of these alloys drop sharply, so they cannot be used to produce structural parts such as automotive power transmission and load bearing systems. The heat-resistant magnesium alloys for auto...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
Inventor 王渠东金正力郑江
Owner SHANGHAI JIAO TONG UNIV
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