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A kind of heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, heat-resistant technology, applied in the field of alloy materials, can solve the problems of casting, alloy sticking, etc., and achieve the effects of excellent tensile strength, low cost, and good heat resistance.

Active Publication Date: 2020-05-05
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although a single trace alkaline earth element (Ca or Sr) or rare earth element can improve the heat resistance of the Mg-Al system alloy, it will bring casting problems such as mold sticking to the alloy

Method used

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  • A kind of heat-resistant magnesium alloy and preparation method thereof
  • A kind of heat-resistant magnesium alloy and preparation method thereof
  • A kind of heat-resistant magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Dosing according to the following mass percentages: Al: 6%; Ca: 2%; Y: 0.6%; Mn: 0.6%; unavoidable impurities ≤ 0.2%; the balance is Mg.

[0051] Pure Mg, pure Al, master alloys Mg-20wt% Ca, Mg-10wt% Mn, Mg-30wt% Y are mechanically polished to remove surface dirt and oxides. Before smelting, raw materials, stirring rods, slag scoops and stainless steel crucibles are preheated to 150°C in a drying oven for drying.

[0052] The raw material pure Mg, pure Al in CO 2 +SF 6 Mixed gas (CO 2 : SF 6 The volume ratio is 99:1) under the protection of melting, after all melting, when the melt temperature reaches 750°C, add the raw material master alloy Mg-20wt%Ca, Mg-10wt%Mn, Mg-30wt%Y, and then keep it at 750°C After 20 minutes, remove slag and stir, add RJ-6 refining agent (the amount added accounts for 0.6wt% of the total amount of the melt) and then raise the temperature to 780°C, let it stand for 20 minutes, and when the temperature drops to 700°C, perform water cooling t...

Embodiment 2

[0055] Dosing according to the following mass percentages: Al: 6%; Ca: 2%; Y: 0.8%; Mn: 0.8%; unavoidable impurities ≤ 0.2%; the balance is Mg.

[0056] Pure Mg, pure Al, master alloys Mg-20wt% Ca, Mg-10wt% Mn, Mg-30wt% Y are mechanically polished to remove dirt and oxides on the surface. Before smelting, raw materials, stirring rods, slag scoops and stainless steel crucibles are preheated to 150°C in a drying oven for drying.

[0057] The raw material pure Mg, pure Al in CO 2 +SF 6 Mixed gas (CO 2 : SF 6 The volume ratio is 99:1) under the protection of melting, after all melting, when the melt temperature reaches 750°C, add the raw material master alloy Mg-20wt%Ca, Mg-10wt%Mn, Mg-30wt%Y, and then keep it at 750°C After 20 minutes, remove slag and stir, add RJ-6 refining agent (the amount added accounts for 0.6wt% of the total amount of the melt) and then raise the temperature to 760°C, and let it stand for 30 minutes. When the temperature drops to 690°C, perform water co...

Embodiment 3

[0060] Dosing according to the following mass percentages: Al: 6%; Ca: 2%; Y: 1%; Mn: 1%, unavoidable impurities ≤ 0.2%; the balance is Mg.

[0061] Pure Mg, pure Al, master alloys Mg-20wt% Ca, Mg-10wt% Mn, Mg-30wt% Y are mechanically polished to remove dirt and oxides on the surface. Before smelting, raw materials, stirring rods, slag scoops and stainless steel crucibles are preheated to 150°C in a drying oven for drying.

[0062] The raw material pure Mg, pure Al in CO 2 +SF 6 Mixed gas (CO 2 : SF 6 The volume ratio is 99:1) under the protection of melting, after all melting, when the melt temperature reaches 750°C, add the raw material master alloy Mg-20wt%Ca, Mg-10wt%Mn, Mg-30wt%Y, and then keep it at 750°C After 20 minutes, remove slag and stir, add RJ-6 refining agent (the amount added accounts for 0.6wt% of the total amount of the melt), then raise the temperature to 770°C, let it stand for 25 minutes, and when the temperature drops to 700°C, perform water cooling t...

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Abstract

The invention provides heat-resistant magnesium alloy and a preparation method thereof. The heat-resistant magnesium alloy comprises the following components in parts by weight: 4 to 9 percent of Al,1.6 to 3 percent of Ca, 0.6 to 1 percent of Y, 0.6 to 1 percent of Mn, less than or equal to 0.2 percent of unavoidable impurities and the balance of Mg. The heat-resistant magnesium alloy has the characteristics of high high-temperautre tensile strength, simple preparation process, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a heat-resistant magnesium alloy material. Background technique [0002] Magnesium alloy has the advantages of low density and high specific strength, and is widely used in automobiles, aerospace and other fields. However, cast magnesium alloys generally have problems such as low strength and insufficient high-temperature heat resistance, which limit their large-scale application. Mg-Al alloys have good mechanical properties, casting properties and atmospheric corrosion resistance. They are currently the most widely used series of cast magnesium alloys. Typical grades are AZ91A-E series, AZ63A, AZ81A, AZ92A, AM100A. Mg-Al alloys have excellent mechanical properties at room temperature, but their strength drops sharply when the service temperature exceeds 120-130°C. This is mainly due to the existence of a large amount of low melting point precipitated phase Mg in the al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 马百常周吉学庄海华王金伟刘运腾林涛刘洪涛
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI