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Preparation method of ultrafine grain rare earth magnesium alloy

A technology of rare earth magnesium and ultra-fine crystals, applied in the field of alloys, can solve the problems of difficult control of magnesium alloy powder metallurgy process, unfavorable industrial production, high equipment cost, etc., and achieve the effect of improving dispersion strengthening effect, low equipment cost, and improving mechanical properties

Active Publication Date: 2013-08-14
XINJIANG TENGXIANG MAGNESIUM PROD CO LTD
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Problems solved by technology

The RS / PM method can prepare materials with a grain size between 250nm and 1.0μm, that is, ultra-fine-grained materials, and its mechanical properties are significantly improved. However, the process for preparing the above-mentioned ultra-fine-grained rare earth magnesium alloy materials by the RS / PM method is relatively complicated. , the equipment cost is high, and the powder metallurgy process of magnesium alloy is difficult to control, and the risk factor is high, which is not conducive to large-scale industrial production

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  • Preparation method of ultrafine grain rare earth magnesium alloy

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[0029] The invention discloses a method for preparing an ultrafine-grain rare earth magnesium alloy, which comprises the following steps:

[0030] a) performing solution treatment on the rare earth magnesium alloy ingot to obtain the solution treated rare earth magnesium alloy;

[0031] b) subjecting the solution-treated rare earth magnesium alloy obtained in step a) to thermal deformation processing to obtain a thermally deformed rare earth magnesium alloy plate, and the temperature of the thermal deformation processing is 350°C to 450°C;

[0032] c) Carrying out the hot-deformed rare earth magnesium alloy plate material obtained in the step b) through accumulative stack rolling with a rolling reduction of 50% in a single pass, and annealing to obtain an ultrafine-grained rare earth magnesium alloy.

[0033] The invention prepares high-performance ultra-fine-grained rare earth magnesium alloy plates through thermal deformation processing-cumulative stack rolling composite pro...

Embodiment 1

[0066] (1) Casting of Mg-Y-Zn alloy: first, clean the surface of pure magnesium ingot with alcohol, rinse with deionized water, dry it, put it into a well-type resistance melting furnace, and feed it with a volume ratio of 40:1. CO 2 and SF 6 Protective gas, heated to 750°C, after the pure magnesium ingot is melted, add pure zinc ingot and Mg-Y rare earth master alloy preheated at 300°C for 30 minutes, manually stir and let stand for 10 minutes, then cool to 720°C and pour 45 #Casting is carried out in a steel permanent cylindrical mold, the ingot diameter is 90mm, and the alloy composition is Mg-6.0wt%Y-2.0wt%Zn.

[0067] (2) Preparation of Mg-Y-Zn alloy sheet: heat the alloy ingot at 330°C for 4h, raise the temperature to 400°C for 8h, and perform water quenching at 70°C, then hot-extrude the alloy at 350°C ℃, the extrusion ratio is 20:1, and the extrusion rate is 2.0mms -1 .

[0068] (3) Surface pretreatment of the alloy plate: process the Mg-Y-Zn alloy plate prepared b...

Embodiment 2

[0075] (1) Casting of Mg-Y-Zn alloy: first, clean the surface of pure magnesium ingot with alcohol, rinse with deionized water, dry it, put it into a well-type resistance melting furnace, and feed it with a volume ratio of 40:1. CO 2 and SF 6 Protective gas, heated to 750°C, after the pure magnesium ingot is melted, add pure zinc ingot and Mg-Y rare earth master alloy preheated at 300°C for 30 minutes, manually stir and let stand for 10 minutes, then cool to 720°C and pour 45 #Casting is carried out in a steel permanent cylindrical mold, the ingot diameter is 90mm, and the alloy composition is Mg-10.0wt%Y-4.0wt%Zn.

[0076] (2) Preparation of Mg-Y-Zn alloy sheet: heat the alloy ingot at 330°C for 4h, heat it up to 500°C for 24h, and perform water quenching at 70°C, then hot-extrude the alloy at 450°C ℃, the extrusion ratio is 5:1, and the extrusion rate is 0.2mms -1 .

[0077] (3) Surface pretreatment of the alloy plate: process the Mg-Y-Zn alloy plate prepared by hot extr...

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Abstract

The invention provides a preparation method of an ultrafine grain rare earth magnesium alloy. The method comprises the following steps of: firstly performing solution treatment on a rare earth magnesium alloy cast ingot to obtain the rare earth magnesium alloy after the solution treatment; then performing heat deformation processing on the obtained rare earth magnesium alloy after the solution treatment to obtain a heat-deformed rare earth magnesium alloy plate, wherein the heat deformation processing temperature is 350 DEG C-450 DEG C; and finally performing accumulative roll bonding with the single-pass rolling reduction of 50% on the obtained heat-deformed rare earth magnesium alloy plate, and annealing to obtain the ultrafine grain rare earth magnesium alloy. According to the preparation method provided by the invention, a heat deformation processing-accumulative roll bonding compound process is firstly adopted to successfully prepare the ultrafine grain rare earth magnesium alloy, and the problem of deterioration of mechanical properties, which is caused by non-uniform distribution of thick and big LPSO (long period stacking ordered) phases in the alloy is effectively solved; and furthermore, the preparation method provided by the invention has the advantages of simple process flow and low equipment cost, and is favorable for further large-scale industrial production.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to a method for preparing an ultrafine-grained rare earth magnesium alloy. Background technique [0002] In many industrial fields, the lightweight of materials can effectively reduce energy consumption, which has positive significance for energy conservation and environmental protection. Since magnesium is the lightest metal structure material, its density is only 1.74g / cm 3 , which is 2 / 3 of the density of aluminum and 1 / 4 of the density of steel, and magnesium and its alloys also have high specific strength and specific stiffness, good shock absorption, strong electromagnetic shielding ability and easy recycling In recent years, magnesium and magnesium alloys have been widely used in automobiles, aerospace, electronics and space industries. They are known as "green engineering materials in the 21st century" and have become the first after steel and aluminum alloys. Three major m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C1/03C22C23/06
Inventor 张洪杰佟立波张庆鑫邱鑫田政程丽任孟健
Owner XINJIANG TENGXIANG MAGNESIUM PROD CO LTD
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