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Ultrahigh-strength magnesium alloy preparation method adopting prestretching composite two-stage ageing technology

A composite two-stage, magnesium alloy technology, applied in the field of magnesium alloy processing, can solve the problems of inability to prepare large components and structural diversification, limited processing size, low production efficiency, etc., to shorten the aging treatment time and improve the yield strength. , reducing the effect of grain boundary precipitation

Active Publication Date: 2019-04-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The materials prepared by these methods usually have low elongation, and the material processing size is limited, the volume is small, the production efficiency is low, and the cost is high, which cannot meet the engineering needs of preparing large components and structural diversification.

Method used

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  • Ultrahigh-strength magnesium alloy preparation method adopting prestretching composite two-stage ageing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The hot-extruded Mg-10Gd-1Er-1Zn-0.6Zr (wt.%) magnesium alloy was pre-stretched at room temperature, pre-stretched parallel to the extrusion direction to produce 2% deformation, and then double-stage aging: first Heat preservation at 100°C for 1 hour for first-stage aging, water quenching and cooling, then aging at 200°C for 36 hours, water quenching and cooling to room temperature. Carry out tensile test on the alloy after the above treatment until it breaks, and obtain the stress-strain curve, such as figure 1 As shown, the yield strength is 454MPa, the tensile strength is 483MPa, and the elongation is 11.1%.

Embodiment 2

[0022] The hot-extruded Mg-10Gd-1Er-1Zn-0.6Zr (wt.%) magnesium alloy was pre-stretched at room temperature, pre-stretched parallel to the extrusion direction to produce 5% deformation, and then double-stage aging: first Heat preservation at 100°C for 1 hour for first-stage aging, water quenching and cooling, then aging at 200°C for 34 hours, water quenching and cooling to room temperature. The alloy after the above treatment is subjected to a tensile test until it breaks, and a stress-strain curve is obtained. The yield strength is 469MPa, the tensile strength is 488MPa, and the elongation is 9.8%.

Embodiment 3

[0024] The hot-extruded Mg-12Gd-1Er-1Zn-0.6Zr (wt.%) magnesium alloy was pre-stretched at room temperature, pre-stretched parallel to the extrusion direction to produce 2% deformation, and then double-stage aging: first Heat preservation at 100°C for 1 hour for first-stage aging, water quenching and cooling, then aging at 200°C for 40 hours, water quenching and cooling to room temperature. Carry out tensile test on the alloy after the above treatment until it breaks, and obtain the stress-strain curve, such as figure 2 As shown, the yield strength is 506MPa, the tensile strength is 549MPa, and the elongation is 8.2%.

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Abstract

The invention discloses an ultrahigh-strength magnesium alloy preparation method adopting a prestretching composite two-stage ageing technology. The method comprises the steps that a thermal deformation magnesium alloy is subjected to prestretching deformation under a certain temperature, and the deformation is controlled to be within 0.5-20%; and then appropriate two-stage ageing treatment is performed, that is, water quenching cooling is performed after heat preservation is performed for 0.25-20 h under the temperature of 80-130 DEG C, then a sample is heated to 140-250 DEG C and subjected to heat preservation for 5-200 h, and an ultrahigh-strength magnesium alloy can be obtained. By means of the method provided by the invention, good plasticity can still be guaranteed while the yield strength of the magnesium alloy is effectively improved, equipment requirements are simple, and operation is easy; and the magnesium alloy with the excellent comprehensive mechanical performance can beprepared, and the industrial application prospects are wide.

Description

technical field [0001] The invention relates to the improvement of the comprehensive mechanical properties of deformed magnesium alloys, especially the yield strength, and specifically relates to a method for preparing ultra-high-strength magnesium alloys by using a pre-stretching composite double-stage aging process, which belongs to the technical field of magnesium alloy processing. Background technique [0002] The density of magnesium alloy is only 2 / 3 of that of aluminum alloy, and it is the lightest structural material in current application. It has broad application prospects in aerospace, automobile transportation, electronic products and medical fields. my country is rich in magnesium resources and is the world's largest producer of primary magnesium. Magnesium alloys have become an ideal substitute for steel and aluminum alloys. Therefore, magnesium alloys are increasingly valued by countries and are known as "green engineering materials in the 21st century". Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 杜文博贾林玥王朝辉刘轲李淑波杜宪
Owner BEIJING UNIV OF TECH
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