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Mg-XAl-YCa-ZZn alloy low in cost, high in performance and high in Ca/Al ratio and preparation method

A high-performance, low-cost technology, applied in the field of Mg-Ca-Al-Zn alloy with high Ca/Al ratio and its preparation, Mg-XAl-YCa-ZZn alloy and its preparation, can solve the problem of low strength and plasticity, cast magnesium Problems such as the decline in the mechanical properties of alloys, to achieve good mechanical properties, improve yield strength, and increase plasticity

Active Publication Date: 2017-05-17
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since Al 2 Ca is a hard and brittle phase. Too much addition of Ca will cause a serious decline in the mechanical properties of cast magnesium alloys, such as low strength and plasticity, which seriously affects its use. For example, the as-cast yield strength of Mg-5Ca-5Al alloy is 105MPa, The tensile strength is 110MPa, and the elongation is less than or equal to 1.5%. Therefore, in the case of maintaining high Ca / Al, the amount of Ca should be controlled as much as possible

Method used

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  • Mg-XAl-YCa-ZZn alloy low in cost, high in performance and high in Ca/Al ratio and preparation method
  • Mg-XAl-YCa-ZZn alloy low in cost, high in performance and high in Ca/Al ratio and preparation method
  • Mg-XAl-YCa-ZZn alloy low in cost, high in performance and high in Ca/Al ratio and preparation method

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Experimental program
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Effect test

Embodiment 1

[0048] The tensile properties at room temperature of the extruded Mg-2Ca-2Al-3Zn alloy are shown in Table 1, and the microstructure of the sample is shown in Figure 1. The extruded microstructure is fine and uniform, and the Al 2 Ca and Ca 2 Mg 6 Zn 3 Fully crushed by extrusion, the distribution on the magnesium matrix becomes uniform, thereby improving the tensile properties. After hot extrusion, defects such as keyhole shrinkage and porosity inside the tissue are welded together, and the structure is more dense and continuous. The grains are elongated, thereby increasing the surface area of ​​the grain boundaries and improving deformation resistance. At the same time, some Zn and other elements solid-dissolved in the magnesium matrix can form Coriolis air masses, pin dislocations, and play the role of solid-solution strengthening. The extrusion process parameters of this embodiment are extrusion ratio 16, extrusion temperature 420°C, extrusion speed 0.5-2.5m / min, since t...

Embodiment 2

[0057] Table 2 shows the full immersion test results of Mg-2Ca-2Al-3Zn and AZ31 in 3.5% NaCl solution at 30°C. It can be seen that the corrosion rate of Mg-2Al-2Ca-3Zn is about AZ31 less than AZ31, even better than WE43 with rare earth elements added. The main reason is that a large amount of Al 2 The formation of the Ca phase inhibits the β-Mg 17 Al 12 Phase formation, redistribution of Al elements avoids α-Mg and β-Mg 17 Al 12 The galvanic corrosion between phases increases the self-corrosion potential of the magnesium alloy and reduces the corrosion current density, thereby hindering the corrosion of the magnesium alloy. It can be seen from Figure 4 that the corrosion current density of Mg-2Al-2Ca-3Zn is lower than that of AZ31, indicating that Mg-2Al-2Ca-3Zn has better corrosion resistance. At the same time, in the anode part, the current increases rapidly with the increase of voltage, but the alloy is not passivated, which indicates that the corrosion products have a...

Embodiment 3

[0061] Table 3 compares the ignition point of Mg-2Ca-2Al-3Zn, AZ80, AZ91 and WE43. It is obvious that the ignition point of Mg-2Ca-2Al-3Zn is much higher than that of existing commercial magnesium alloys, even exceeding that of WE43 with rare earth added. This will be very beneficial to the flame retardancy of magnesium alloys in smelting and the use in specific environments, broadening the application of magnesium alloys. The main reason is that the addition of Ca can increase the compactness of the oxide film on the surface of the magnesium alloy. When the molten metal is disturbed, the oxide film containing Ca has better self-repair and regeneration ability. At the same time, the structure contains a large amount of high melting point stable phase Al 2 Ca (melting point 1079°C) hinders the combustion of magnesium and improves the flame retardancy. With the increase of Ca and Al content in Mg-XCa-YAl-ZZn, its flame retardancy will be further improved.

[0062] Table 3 Igni...

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Abstract

The invention discloses an Mg-XAl-YCa-ZZn alloy and a preparation method. The alloy comprises, by weight percentage, 2-4% of Ca, 2-4% of Al, 2.9-6% of Zn and the balance Mg or an Mg solid solution, wherein the mass ratio of the Ca to the Al in the alloy is 0.8-1.2. According to the preparation method of the alloy, direct water-cooling semicontinuous casting is conducted, so that a microscopic structure which surrounds an Mg substrate and is of a solid solution structure containing a netlike Al2Ca phase and a granulous MgZn phase is obtained; and the extrusion mode is adopted for further refining crystalline grains, and meanwhile the netlike structure of Al2Ca and Ca2Mg6Zn3 is fully crushed into micron grains and submicron grains, so that a composite uniform in structure, fine in crystalline grain and obvious in reinforcing effect is obtained. The Mg-XAl-YCa-ZZn alloy is low in cost; the obtained composite is small in weight and excellent in mechanical performance, flame retardation performance, corrosion resistance and processing performance; and the defects that existing magnesium alloys are easy to corrode and combust, difficult to process and the like are overcome. The Mg-XAl-YCa-ZZn alloy has extremely high industrial application value in all fields.

Description

technical field [0001] The invention discloses a Mg-XAl-YCa-ZZn alloy and a preparation method, which is a low-cost, high-performance Mg-Ca-Al-Zn alloy with a high Ca / Al ratio and a preparation method; it belongs to magnesium alloy or The technical field of magnesium-based composite material preparation. Background technique [0002] Magnesium alloys have the characteristics of high specific strength, high dimensional stability, good machinability and easy recycling. It has broad application prospects in automobile, aerospace, electronics and other industries. However, magnesium alloys are easy to corrode, easy to burn, and difficult to form by thermal processing, which limits the large-scale industrial application of magnesium alloys. Therefore, improving the processing performance, corrosion resistance and combustion temperature of magnesium alloys has always been an important topic in the research of magnesium alloys. . The combustion temperature of most existing magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/02C22C23/04C22F1/06
CPCC22C23/00C22C23/02C22C23/04C22F1/06
Inventor 陈鼎
Owner HUNAN UNIV
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