Er-containing high-strength high-plasticity heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, high-plasticity technology, applied in the field of alloy materials, can solve the problems of reducing alloy plasticity and aggravating dislocation accumulation, so as to achieve the effect of improving strength, improving mechanical properties and hindering dislocation slippage

Pending Publication Date: 2021-12-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existence of the second phase particles in the alloy intensifies the accumulation of dislocations, improves the strength of the alloy, and at the same time promotes the initiation of cracks and reduces the plasticity of the alloy.

Method used

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  • Er-containing high-strength high-plasticity heat-resistant magnesium alloy and preparation method thereof
  • Er-containing high-strength high-plasticity heat-resistant magnesium alloy and preparation method thereof
  • Er-containing high-strength high-plasticity heat-resistant magnesium alloy and preparation method thereof

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preparation example Construction

[0030] The preparation method of the high-strength and high-plastic heat-resistant magnesium alloy containing Er of the present invention comprises the following steps:

[0031] a. Material selection: select raw materials according to the weight percentage of elements, the raw materials are industrial pure magnesium ingots, industrial pure zinc, Mg-30Y (wt.%) master alloy, Mg-30Er (wt.%) master alloy and Mg- 30Zr (wt.%) master alloy;

[0032] b. Smelting: Weigh the raw materials according to the elemental composition of the invented Er-containing high-strength, high-plasticity heat-resistant magnesium alloy, melt them under vacuum or protective atmosphere conditions, and then cast them into castings;

[0033] c. Homogenization treatment: homogenize the casting at 500-550° C. for 10-12 hours;

[0034] d. Extrusion deformation: Extrude and deform the homogenized casting at an extrusion temperature of 350-400°C, an extrusion ratio of 33-35, and an extrusion speed of 0.1-0.3mm / s,...

Embodiment 1

[0039] The Er-containing high-strength and high-plasticity heat-resistant magnesium alloy in this embodiment includes the following components in terms of element weight percentage: 9.0% Er, 4.0% Y, 0.5% Zn, 0.5% Zr, and the rest is Mg.

[0040] The preparation process of the high-strength and high-plastic heat-resistant magnesium alloy containing Er in this embodiment is as follows:

[0041] In the high-frequency electromagnetic induction melting furnace, pure Mg block (99.9wt.%) is added, the furnace temperature rises to 750±5°C and SF 6 :CO 2 The protective gas with a volume ratio of 1:200, after the magnesium block is completely melted, skim off the scum on the surface of the melt, and then add pure Zn (99.9wt.%), Mg-30Y (wt.%) master alloy, Mg- 30Er (wt.%) master alloy, after all melting, when the furnace temperature rises to 780±5°C, add Mg-30Zr(wt.%) master alloy, and then remove the slag on the melt surface and the crucible wall. After the intermediate alloy is compl...

Embodiment 2

[0046] The Er-containing high-strength and high-plasticity heat-resistant magnesium alloy in this embodiment includes the following components by weight percentage of elements: 8.9% Er, 4.0% Y, 0.6% Zn, 0.4% Zr, and the rest is Mg.

[0047] The preparation process of the high-strength and high-plastic heat-resistant magnesium alloy containing Er in this embodiment is as follows:

[0048] In the high-frequency electromagnetic induction melting furnace, add pure Mg block (99.9wt.%), the furnace temperature rises to 750 ° C ± 5 and SF 6 :CO 2 Protective gas with a volume ratio of 1:200. After the magnesium block is completely melted, skim off the scum on the surface of the melt, and then add pure Zn (99.9wt.%), Mg-30Y (wt.%) master alloy, Mg-30Er (wt.%) master alloy, after all melting, when the furnace temperature rises to 780±5°C, add Mg-30Zr(wt.%) master alloy, and then remove the molten slag on the surface of the melt and the crucible wall. After the intermediate alloy is co...

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Abstract

The invention discloses an Er-containing high-strength high-plasticity heat-resistant magnesium alloy and a preparation method thereof. The Er-containing high-strength high-plasticity heat-resistant magnesium alloy comprises the following components of, in percentage by weight, 8.0%-9.0% of Er, 3.0%-4.0% of Y, 0.5%-0.6% of Zn, 0.4%-0.5% of Zr and the balance Mg. The preparation method of the Er-containing high-strength high-plasticity heat-resistant magnesium alloy comprises the steps of material selection, smelting, homogenization treatment, extrusion deformation and aging heat treatment. The Er-containing high-strength, high-plasticity and heat-resistant magnesium alloy has high elongation, can bear large plastic deformation, and can be applied to high-strength, high-plasticity and heat-resistant structural parts in the high-tech fields of aerospace, automobiles, military weapons and the like.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to an Er-containing high-strength, high-plasticity heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is by far the lightest metal structure material, its density is only 2 / 3 of aluminum, 1 / 4 of steel, and it has high specific strength and specific stiffness. In addition, magnesium alloy also has many excellent properties such as good damping, machinability and thermal conductivity, easy recycling and regeneration, and its application fields are expanding day by day. [0003] Usually, the increase in strength of traditional magnesium alloys is often accompanied by a decrease in plasticity, so it is difficult to obtain high-strength and high-plasticity magnesium alloys at the same time. The main reason is that the number of slip coefficients in magnesium alloy is limited, and it is difficult to activate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06
Inventor 房大庆孟琪明李苏植张晓茹丁向东孙军
Owner XI AN JIAOTONG UNIV
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