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Heat-proof magnesium-base rare earth alloy and its preparation method

A rare-earth alloy and heat-resistant technology, which is applied in the field of heat-resistant magnesium-based alloys and their preparation, can solve the problems of limited varieties of heat-resistant magnesium-based rare-earth alloys, unsatisfactory performance/price ratio, and inefficient utilization of rare-earth resources. Excellent comprehensive performance, the effect of reducing the cost of the alloy

Inactive Publication Date: 2007-08-01
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a heat-resistant magnesium-based rare-earth alloy and a preparation method thereof, in view of the shortage of rare-earth element types and quantity combinations existing in the existing heat-resistant magnesium-based rare-earth alloys, and the problem of unsatisfactory performance / price ratio. High-performance heat-resistant magnesium-based rare-earth alloy with multiple combinations of Gd-Nd, Gd-Sm, Gd-MY, Gd-Dy, Gd-Ho and Gd-Er and its preparation method
To solve the problems that there are not many types of heat-resistant magnesium-based rare earth alloys available in industry, the price / performance ratio is not ideal, and the rare earth resources cannot be efficiently utilized

Method used

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  • Heat-proof magnesium-base rare earth alloy and its preparation method
  • Heat-proof magnesium-base rare earth alloy and its preparation method
  • Heat-proof magnesium-base rare earth alloy and its preparation method

Examples

Experimental program
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Embodiment 1

[0037] Raw material proportioning is carried out according to the composition of Mg-6%Gd-3%Dy-0.5%Zr, wherein the percentages are weight percentages, and Mg is the balance. The raw materials used in this formula are commercially available Mg ingots with a purity of 99.9%, 99.5% Mg-20%Gd and Mg-25%Dy master alloy ingots, and 99.5% Mg-30%Zr master alloy ingots. After metal ingots and alloy ingots are cut, degreased, dried and descaled, the degreasing method is mainly to soak the metal and alloy raw materials in lye containing surfactants for scrubbing and then rinse with clean water; drying is natural Drying; the method of descaling is mechanical removal by filing or planing.

[0038] Counterweight according to the designed content. The weighted metal block and alloy block are dipped in molten salt in the molten salt pool and then added to the melting temperature T f In the melting furnace at 780°C, the order of adding raw materials is: metal Mg, Mg-20%Gd, Mg-25%Dy and Mg-30%Z...

Embodiment 2

[0048] All the other are with embodiment 1. The composition of the heat-resistant magnesium alloy is Mg-8%Gd-1%Dy-0.5%Zr. Its preparation process parameter is: T f is 650℃, ts is 2min, t p 10min, T w at 200°C, T p at 670°C, T wg at 60°C, T at at 200°C, t at for 50h.

[0049] The mechanical properties of the as-cast Mg-8%Gd-1%Dy-0.5%Zr heat-resistant magnesium alloy of the present invention are:

[0050] Room temperature: tensile strength: 202MPa; yield strength: 113MPa; elongation: 7.8%.

[0051] 250°C: tensile strength: 179MPa; yield strength: 107MPa; elongation: 11%.

[0052] The mechanical properties of the Mg-8%Gd-1%Dy-0.5%Zr heat-resistant magnesium alloy of the present invention after heat treatment are:

[0053] Room temperature: tensile strength: 367MPa; yield strength: 270MPa; elongation: 6.7%.

[0054] 250°C: tensile strength: 290MPa; yield strength: 215MPa; elongation: 8.9%.

Embodiment 3

[0056] All the other are with embodiment 1. The composition of the heat-resistant magnesium alloy is Mg-7%Gd-5%Dy-0.4%Zr. Its preparation process parameter is: T f is 715℃, ts is 6min, t p 15min, T w 210°C, T p 690°C, T wg at 60°C, T at at 230°C, t at It is 72h.

[0057] The mechanical properties of the as-cast Mg-7%Gd-5%Dy-0.4%Zr heat-resistant magnesium alloy of the present invention are:

[0058] Room temperature: tensile strength: 242MPa; yield strength: 123MPa; elongation: 7.1%.

[0059] 250°C: tensile strength: 199MPa; yield strength: 128MPa; elongation: 9.4%.

[0060] The mechanical properties of the Mg-7%Gd-5%Dy-0.4%Zr heat-resistant magnesium alloy of the present invention after heat treatment are:

[0061] Room temperature: tensile strength: 379MPa; yield strength: 275MPa; elongation: 7.7%.

[0062]250°C: tensile strength: 298MPa; yield strength: 235MPa; elongation: 9.8%.

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Abstract

The invention relates to thermal resistant magnesium-base rare earth alloy and the preparing method. The alloy comprises following components: Gd 6-8wt%, R 1- 5wt%, Zr 0.3-0.6wt%, mixture of Ni, Cu, Fe, Si and Al, not more than 100 wt%, and the left is Mg. The general formula is Mg-(6-8%)Gd-(1-5%)R-(0.3-0.6%)Zr, R is Nd, or Sm, or MY, or Dy or Ho, or Er; and the RE total weight in alloy is controlled between 7%- 13%. The invention is to solve problem of less varieties of available rare earth thermal resistant magnesium alloy, and to provide high- performance thermal resistant magnesium-base rare earth alloy with proper amount combination of GD and RE and the preparing method. The invention employs cheap MY to replace pure Y for alloy element, which can not only guarantee good comprehensive performance, but aslo reduce aloy cost, and gets high perfromance price ratio alloy.

Description

Technical field: [0001] The invention relates to a heat-resistant magnesium-based rare earth alloy and a preparation method thereof. In particular, it relates to a heat-resistant magnesium-based alloy with gadolinium and another rare earth as main alloying elements and a preparation method thereof. Background technique [0002] Magnesium-based rare earth alloys are one of the materials with the best properties among heat-resistant magnesium alloys. In particular, alloys with high rare earth content have excellent mechanical properties in the temperature range of 150°C to 300°C. However, so far, there are two main deficiencies in the design, preparation and application of this type of alloy: ① The research on rare earth elements as strengthening elements of magnesium alloys is not enough, and there are not many types available for practical use. . ② There is still great potential to improve the performance / price ratio of this type of heat-resistant alloy by using the combi...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03B22D21/04C22F1/06
Inventor 彭秋明王立民吴耀明董含武王立东孟健张洪杰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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