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Mg-Zn-Y directional solidification alloy and preparing method thereof

A directional solidification, mg-zn-y technology, applied in the field of Mg-Zn-Y alloy, can solve the problems of coarse solidification structure and insufficient quasi-crystal strengthening effect.

Active Publication Date: 2016-01-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solidification structure of the existing quasicrystal reinforced Mg-Zn-Y alloy is coarse, and the quasicrystals are mostly connected in the form of a eutectic structure and distributed in a network between α-Mg dendrites, resulting in the inability to fully exert the strengthening effect of the quasicrystals. , then the high-temperature mechanical properties of the Mg-Zn-Y alloy cannot be improved in a real sense

Method used

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  • Mg-Zn-Y directional solidification alloy and preparing method thereof
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  • Mg-Zn-Y directional solidification alloy and preparing method thereof

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Embodiment 1

[0058] Embodiment 1 of the present invention: a kind of Mg-Zn-Y directionally solidified alloy is prepared by the following method (as Figure 13 shown):

[0059] a. Take 88g of Mg ingot, 12g of Zn ingot with a purity (mass fraction) of 99.9%, and 2.5g of Mg-30Y (30%, mass fraction) master alloy, mix the above-mentioned raw materials, heat and melt, and obtain an alloy liquid;

[0060] b. continue to heat the alloy liquid, and control the alloy liquid to be cast into the down-drawing system of the directional solidification equipment at different casting temperatures, and simultaneously control the down-drawing system to pull at different pulling speeds; wherein, the directional The vacuum in the furnace chamber of the solidification equipment is 2.4×10 -2 Pa;

[0061] c. Utilize the down rod, water-cooled copper ring and gallium-indium alloy to form the cold end of the quenching table capable of directional movement, the temperature of the alloy liquid and the cold end form...

Embodiment 2

[0065] Embodiment 2: a kind of Mg-Zn-Y directionally solidified alloy is prepared by the following method (as Figure 13 shown):

[0066] a. Take 92g of Mg ingot with a purity (mass fraction) of 99.9%, 8g of Zn ingot, and 1.2g of Mg-30Y (30%, mass fraction) master alloy, mix the above-mentioned raw materials, heat and melt, and obtain an alloy liquid;

[0067] b. continue to heat the alloy liquid, and control the alloy liquid to be cast into the down-drawing system of the directional solidification equipment at different casting temperatures, and simultaneously control the down-drawing system to pull at different pulling speeds;

[0068] c. Utilize the down rod, water-cooled copper ring and gallium-indium alloy to form the cold end of the quenching table capable of directional movement, the temperature of the alloy liquid and the cold end form a temperature gradient, and maintain the solid-liquid interface at the beginning of casting through the insulation jacket and the pulli...

Embodiment 3

[0072] Embodiment 3: A Mg-Zn-Y directionally solidified alloy prepared by the following method:

[0073] a. Take 89.2 g of Mg ingots with a purity (mass fraction) of 99.9%, 9 g of Zn ingots, and 1.8 g of Mg-30Y (30%, mass fraction) master alloy, mix the above-mentioned raw materials, heat and melt them, and obtain an alloy liquid;

[0074] b. continue to heat the alloy liquid, and control the alloy liquid to be cast into the down-drawing system of the directional solidification equipment at different casting temperatures, and simultaneously control the down-drawing system to pull at different pulling speeds;

[0075] c. Utilize the down rod, water-cooled copper ring and gallium-indium alloy to form the cold end of the quenching table capable of directional movement, the temperature of the alloy liquid and the cold end form a temperature gradient, and maintain the solid-liquid interface at the beginning of casting through the insulation jacket and the pulling speed The formed t...

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Abstract

The invention discloses Mg-Zn-Y directional solidification alloy and a preparing method thereof. The Mg-Zn-Y directional solidification alloy comprises, by mass, 6.00%-9.00% of Zn, 1.00%-2.00% of Y and the balance Mg. The Mg-Zn-Y directional solidification alloy and the preparing method thereof have the beneficial effects that the Mg-Zn-Y directional solidification alloy has columnar crystal tissue, has high strength and certain plasticity under the room temperature, and more importantly has high-temperature mechanical performance; particularly, the Mg-Zn-Y directional solidification alloy obtains a columnar crystal tissue with specific orientation, wherein in the columnar crystal tissue, primary arm growing is parallel, a longitudinal crystal boundary is straight, and a transverse crystal boundary does not exist. Granular phases are dispersed and distributed in crystals, and the crystal boundary phases and the crystal internal granular phases are icosahedron quasi-crystals I-Mg3Zn6Y; and the problems that in the prior art, Mg-Zn-Y alloy solidification tissue is thick, quasi-crystals are connected into a net shape in an eutectic structure form to be distributed among alpha-Mg dendritic crystals, and the quasi-crystal strengthening function cannot be developed fully are solved.

Description

technical field [0001] The invention relates to a Mg-Zn-Y directionally solidified alloy and a preparation method thereof, belonging to the technical field of Mg-Zn-Y alloys. Background technique [0002] As the lightest metal structural material, magnesium alloy material has excellent performance in many aspects, and is known as "green engineering material in the 21st century". However, the existing magnesium alloys have poor high-temperature mechanical properties. When the temperature exceeds 120°C, their strength and creep resistance tend to drop significantly, making it difficult to use them for a long time at high temperatures. Therefore, how to improve the high-temperature mechanical properties of magnesium alloys has always been an important topic in the field of magnesium alloy research. [0003] Mg-Zn-Y alloy is a new type of magnesium alloy material, which has special properties due to its unique structure. According to data records, quasicrystal I-Mg in Mg-Zn-Y ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03
Inventor 林小娉罗晶吴厚卜印策朱壮徐献义
Owner NORTHEASTERN UNIV
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