Preparation method for rear-earth magnesium alloy

A rare earth magnesium and alloy technology, applied in the field of metal materials, can solve the problems that the tensile strength and yield strength need to be improved

Active Publication Date: 2014-09-03
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

The researchers believe that the co-deposited β′ phase and the precipitated phase on the basal plane significantly improve the age hardening effect and the strength of the alloy, even in the under-aging stage, and at the same time, the high temperature (≥200°C) performance of the alloy is also greatly improved , but its tensile strength and yield strength need to be improved

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  • Preparation method for rear-earth magnesium alloy
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  • Preparation method for rear-earth magnesium alloy

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preparation example Construction

[0028] The invention provides a preparation method of a rare earth magnesium alloy, comprising: casting a magnesium melt, extruding after solution treatment, and then performing cold rolling and aging treatment to obtain a rare earth magnesium alloy; the magnesium melt The elements and contents in the rare earth magnesium alloy are the same as those in the rare earth magnesium alloy; the rare earth magnesium alloy includes Mg, Nd, Gd, Y, Zn and Zr.

[0029] Wherein the rare earth magnesium alloy is a rare earth magnesium alloy containing the above elements well known to those skilled in the art, and there is no special limitation. The present invention preferably includes: 0.1 to 10 wt% of Nd, 10 to 12 wt% of Gd, 3 to 5wt% of Y, 0.5-2wt% of Zn, 0.3-0.8wt% of Zr, the balance of Mg and unavoidable impurities.

[0030] The elements and content in the magnesium melt are the same as those in the rare earth magnesium alloy, and the method for obtaining it can be a method well known ...

Embodiment 1

[0046] 1.1 Divide pure Mg ingots, pure Zn ingots, 20% Mg-Gd master alloys, 20% Mg-Y master alloys, 20% Mg-Nd master alloys and 30% Mg-Zr master alloys, remove scale and oil And dry, according to element content Gd11.2wt%, Y4.5wt%, Zn1.5wt%, Nd1wt%, Zr0.5wt%, the balance is the proportioning material taking of Mg. Preheat and dry No. 5 flux.

[0047] 1.2 Under the protection of 99% carbon dioxide and 1% sulfur hexafluoride mixed gas, add No. 5 flux with 2wt% alloy raw materials, pure Mg ingot and pure Zn ingot weighed in 1.1 into the melting furnace, and heat up to 730 ℃, add the Mg-Gd master alloy and Mg-Nd master alloy weighed in 1.1, stir for 2min, heat up to 780℃, add Mg-Y master alloy and Mg-Zr master alloy, stir for 2min, cool down to 730℃, add No. 5 flux of 2wt% alloy raw materials, after stirring for 12 minutes, blowing in argon gas for refining for 15 minutes, heating up to 780°C, keeping the temperature for 25 minutes, cooling to 750°C for 15 minutes, and removing th...

Embodiment 2

[0056] Turn the round bar obtained in 1.2 into a Ф82mm×120mm extrusion ingot, after 525°C, 24h solution treatment, extrude into a Ф15mm round bar at 425°C, the extrusion ratio is 30:1, and then process it Cold rolling into 120mm×8mm×2.8mm thin sheets, the cold rolling direction is the extrusion direction of the magnesium alloy, the initial rolling amount is 5% / pass, and the subsequent pass rolling amount is 3%~5% / pass , the total rolling amount is 10%, and then aging treatment is carried out under the condition of 210° C. for 24 hours to obtain a rare earth magnesium alloy.

[0057] Performance tests were performed on the rare earth magnesium alloy obtained in Example 2, and its tensile strength was 495 MPa, its yield strength was 466 MPa, and its elongation was 3.1%.

[0058] The rare earth magnesium alloy obtained in embodiment 2 is carried out tensile property test, obtains its tensile curve figure, as Figure 4 Shown in b.

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Abstract

The invention provides a preparation method for a rear-earth magnesium alloy. The preparation method comprises the following steps of: casting a magnesium melt, extruding and forming after solution treatment, then carrying out cold-rolling and ageing treatment to obtain the rear-earth magnesium alloy, wherein the rear-earth magnesium alloy comprises Mg, Nd, Gd, Y, Zn and Zr. Compared with the prior art, cold-rolling and ageing treatment is carried out after carrying out solution treatment, extruding and forming, so that a great number of beta phases and LPSO phases exist on a crystal boundary, the crystal boundary is pinned to prevent crystalline grains from growing in a transformation process, crystalline grains in the alloy are refined, and therefore, yield strength of the rear-earth magnesium alloy is improved; the rear-earth magnesium alloy has the LPSO phases with 14H structures, and is regularly distributed along extruding direction; stability of the boundary improves strength and toughness of the rear-earth magnesium alloy; moreover, high-density dislocation is introduced in cold-rolling, and nucleation of beta' phases in an ageing process is promoted, so that ageing hardening effect of the alloy is improved; meanwhile, the beta' phases can be more refined by the cold-rolling.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a preparation method of a rare earth magnesium alloy. Background technique [0002] Magnesium and its alloys have light weight, high specific strength, high specific stiffness, excellent damping performance and electromagnetic shielding performance, which can greatly reduce the weight of structural parts and improve their service performance, which is of great significance in the fields of aerospace, national defense and military industry . However, the commonly used magnesium alloys have problems such as low strength and low service temperature. Research and development of high-strength and heat-resistant magnesium alloys has become an important issue that needs to be solved urgently. [0003] The strength and heat resistance of magnesium alloys can be significantly improved by adding rare earths. Systematically study the effects of rare earth types and addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
Inventor 孟健邱鑫于子健牛晓东孙伟田政张德平王鸿燕
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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