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Mg-Ca-Al alloy and preparation method

A mg-ca-al alloy technology, applied in the field of Mg-Ca-Al alloy and its preparation, Mg-Ca-Al alloy with high Ca/Al ratio and its preparation field, can solve the problem of decreased mechanical properties of cast magnesium alloy, alloy without Alloy grades, no in-depth research and other issues, to achieve the effect of improving yield strength, good mechanical properties, and overcoming corrosion

Active Publication Date: 2015-04-22
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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%. So far, Mg-Al alloys with a high Ca / Al ratio have no alloy grades at home and abroad, and no one has conducted in-depth research

Method used

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Embodiment 1

[0043] The room temperature tensile properties of as-cast and extruded Mg-5Ca-5Al alloys are shown in Table 1, and the microstructure of the samples is as follows figure 1 with 2 As shown, the tensile properties of the as-cast samples are poor, which is due to the large amount of brittle high-hard phase Al 2 The continuous precipitation of Ca along the grain boundaries splits the magnesium alloy matrix, resulting in a decrease in tensile properties. Al in extruded microstructure 2 Ca is fully crushed by extrusion, and the distribution on the magnesium matrix becomes uniform, thereby improving the tensile properties. The mechanical properties are shown in Table 1; the extrusion process parameters of this embodiment are extrusion ratio 16, extrusion temperature 420°C, extrusion speed 0.5-2.5m / min, because the extrusion ratio is 16, the mechanical properties are not fully reflected , if the extrusion ratio is increased to 20-40, the above performance can be greatly improved. ...

Embodiment 2

[0047] Extruded Mg-4Ca-5Al, extrusion ratio 18, extrusion temperature 410°C, extrusion speed 0.5-2.5m / min, yield strength and tensile strength are 305MPa and 320MPa, respectively, and elongation is 3%.

Embodiment 3

[0051] The high-temperature tensile properties of the extruded Mg-5Ca-5Al alloy are shown in Table 2 and image 3 As shown, superplasticity begins to be produced at 300 ° C, and the superplasticity of this extruded billet greatly improves the subsequent processing of Mg-Ca-Al alloys. It has great practical value for processing various complex magnesium alloy parts.

[0052] Table 2 High temperature tensile properties of extruded Mg-5Ca-5Al alloy

[0053]

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Abstract

The invention discloses Mg-Ca-Al alloy high in Ca / Al ratio and a preparation method. The alloy comprises, by weight, 4-12% of Ca, 5-10% of Al and the balance of Mg or a solid solution of Mg, and the mass ratio of Ca / Al is 0.8 to 1.2. The alloy is cast through a direct water cooling semicontinuous casting die or a rapid cooling casting die, microscopic structures comprising net-shaped Al2Ca structures are obtained, the net-shaped Al2Ca structures are fully smashed into micrometer or submicron particles through extrusion, and meanwhile, crystal grains are further fined so that a Mg-Al2Ca composite material can be obtained. The prepared Mg-Ca-Al alloy has good mechanical property, high burning temperature, high anti-corrosion performance and superelasticity, and the defects that existing Mg alloy is prone to corrosion and combustion and difficult to machine thermally, and application of the Mg alloy is seriously affected are overcome. The alloy solves the problems that the existing Mg alloy is prone to corrosion and combustion and difficult to machine thermally to a certain degree and can effectively expand the industrial application value of the Mg alloy.

Description

technical field [0001] The invention discloses a Mg-Ca-Al alloy and its preparation method, in particular to a Mg-Ca-Al alloy with a high Ca / Al ratio and its preparation method; it belongs to the technical field of preparation of magnesium alloys and / or magnesium-based composite materials . 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 magnesium alloys is...

Claims

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Application Information

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