Ca and heavy rare earth Gd-containing die-casting heat resisting magnesium alloy and preparation thereof

A technology of heavy rare earth and magnesium alloy, which is applied in the field of die-casting heat-resistant magnesium alloy and its preparation, can solve the problems of poor plasticity of the alloy, reduce the elongation of the alloy, etc., and achieve the effect of low cost, simple process, and improved shape and distribution

Inactive Publication Date: 2009-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the Al in the alloy 2 Ca elongated grain boundaries are distributed in a net

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] The alloy composition (percentage by weight) is: 3.5% Al, 2.8% Ca, 0.2% Gd, 0.1% Mn, the content of impurity elements is less than 0.02%, and the rest is Mg. The alloy smelting process is as follows: configure the alloy according to the above ingredients, add 100 kg of industrial pure magnesium to the resistance crucible boiler, and use N 2 +0.2% SF 6 Mixed gas protection, after the magnesium is completely melted, add 1.00Kg of industrial pure aluminum, 3.00 kg of industrial pure calcium and 1.1Kg of Al-10Mn master alloy at 660°C, add Mg-Gd master alloy at 670°C, raise the temperature to 752°C and Keep the temperature at this temperature for 30 minutes, cool down to the pouring temperature of 680°C, and then pour it into the die-casting machine through the quantitative pouring system for die-casting. The room temperature tensile strength of the alloy in this example is 225MPa, the yield strength is 162MPa, and the elongation is 5.1%; the tensile strength at 200°C is 18...

example 2

[0020] The composition (percentage by weight) of the alloy is: 8.0% Al, 1.1% Ca, 2.9% Gd, 0.4% Mn, the composition 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 100 kg of industrial pure magnesium to the resistance crucible boiler, heat and melt, and sprinkle a small amount of covering agent for protection at the same time, after the magnesium is completely melted, add 4.50 kg of industrial pure aluminum at 655 ° C , industrial pure calcium 1.3Kg and Al-10Mn master alloy 4.5Kg, add Mg-Gd master alloy at 670°C, raise the temperature to 758°C and keep it at this temperature for 30 minutes, cool down to 682°C, and then pour in through the quantitative pouring system Die casting machine for die casting. The room temperature tensile strength of the alloy in this example is 234MPa, the yield strength is 176MPa, and the elongation is 6.3%; the tensile strength at...

example 3

[0022] The alloy composition (percentage by weight) is: 4.7% Al, 2.1% Ca, 2.3% Gd, 0.3% Mn, the content of impurity elements is less than 0.02%, and the rest is Mg. The alloy smelting process is as follows: configure the alloy according to the above ingredients, add 100 kg of industrial pure magnesium to the resistance crucible boiler, and use N 2 +0.2% SF 6 Mixed gas protection, after the magnesium is completely melted, add 2.0Kg of industrial pure aluminum, 2.3Kg of industrial pure calcium and 3.3Kg of Al-10Mn master alloy at 660°C, add Mg-Gd master alloy at 675°C, raise the temperature to 755°C and Keep it warm at this temperature for 30 minutes, cool down to 680°C, and then pour it into a die-casting machine through a quantitative pouring system for die-casting. The room temperature tensile strength of the alloy in this example is 245MPa, the yield strength is 168MPa, and the elongation is 5.1%; the tensile strength at 200°C is 205MPa, the yield strength is 183MPa, and th...

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Abstract

The invention relates to a die-casting heat resistant magnesium alloy containing Ca and heavy rare earth element Gd and a preparation method thereof, pertaining to the metal material technical field. The components and weight percentage thereof of the alloy are: 3.0 to 8.0 percent of Al, 0.1 to 3.0 percent of Ca, 0.1 to 3.0 percent of Gd, 0 to 0.5 percent of Mn, lower than 0.02 percent of impurity elements and the rest is Mg. The preparation method of the alloy comprises the following steps: the materials are weighed, and industrial pure Mg is heated under the protection of the mixed gas of N2 and 0.2 percent of SF6; after Mg is wholly melted, industrial pure Al, industrial pure Ca and Al-Mn interalloy are added at the temperature of 650 to 680 DEG C, Mg-Gd interalloy is added at the temperature of 660 to 680 DEG C, the temperature is increased to 740 to 760 DEG C, and when the Mg liquid is cooled to 670 to 690 DEG C, the mixture carries out die casting. The preparation method of the invention has the advantages of low cost and high production efficiency, obviously increases the tensile strength, the yield strength, the elongation percentage and the creep resistance of the alloy at room temperature, and has excellent die-casting performance.

Description

technical field [0001] The invention relates to a die-casting heat-resistant magnesium alloy in the technical field of metal materials and a preparation method thereof, in particular to a die-casting heat-resistant magnesium alloy containing Ca and heavy rare earth Gd and a preparation method thereof. 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...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03
Inventor 王渠东郑江顾金海金正力
Owner SHANGHAI JIAO TONG UNIV
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