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Magnesium alloy for bicycle frame and preparation method thereof

A bicycle frame and magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of low strength, high cost, expensive rare earth, etc., and achieve the effects of easy welding, enhanced creep resistance, and disappearance of weld crack tendency.

Active Publication Date: 2014-03-19
山东宏泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg-Mn series magnesium alloy has the best welding performance among existing magnesium alloys, so it is very suitable for bicycle frame pipes, but its disadvantage is that its strength is not high
There are two types of alloys belonging to the Mg-Mn system, MB1 and MB8. MB8 adds rare earth Ce to MB1. Although the strength of the alloy is improved, the cost is high because rare earths are expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 94.9Kg of Mg9998 primary magnesium ingot, 3.1Kg of pure Cu powder, 0.4Kg of pure manganese powder, and 1.6Kg of 30%Mg-Nd alloy. Heat to 750°C and melt for 4 hours, stir with a stirrer for 15 minutes, and take samples for analysis after completion. The measured content is Cu3.031%, Mn0.329%, Nd0.312%, Si<0.01%, Fe<0.01%, Ni<0.001%, which meet the requirements of element content, and stand for 40 minutes after passing; casting; extrusion; Then heat treatment.

[0020] Using electromagnetic casting technology, the grains are refined by increasing the nucleation number. The electromagnetic frequency is 15Hz and the current is 90A.

[0021] The billet is repeatedly extruded 3 times before extrusion; the temperature of the furnace charge is controlled at 400°C, the temperature of the extrusion barrel is controlled at 380°C, and the extrusion ratio is controlled at 40.

[0022] The solid solution temperature of heat treatment is 500°C, the holding time is 3h, and the ...

Embodiment 2

[0026] (1) Weigh 92.4Kg of Mg9998 primary magnesium ingot, 4Kg of pure Cu powder, 0.8Kg of pure manganese powder, and 2.8Kg of 30%Mg-Nd alloy. Heat to 730°C and melt for 5 hours, stir with a stirrer for 20 minutes, and take samples for analysis after completion. The measured content is Cu3.926%, Mn0.719%, Nd0.653%, Si<0.01%, Fe<0.01%, Ni<0.001%, which meet the requirements of element content, and stand for 50 minutes after passing; casting; extrusion; Then heat treatment.

[0027] Using electromagnetic casting technology, the grains are refined by increasing the nucleation number. The electromagnetic frequency is 20Hz and the current is 100A.

[0028] The blank was repeatedly extruded 5 times before extrusion; the temperature of the furnace charge was controlled at 500°C, the temperature of the extrusion barrel was controlled at 450°C, and the extrusion ratio was controlled at 90.

[0029] The solid solution temperature of heat treatment is 550°C, the holding time is 5h, an...

Embodiment 3

[0033] Weigh 92.4Kg of Mg9998 primary magnesium ingot, 3.6Kg of pure Cu powder, 0.6Kg of pure manganese powder, and 2.3Kg of 30%Mg-Nd alloy. Heat to 740°C and melt for 4 hours, stir with a stirrer for 15 minutes, and take samples for analysis after completion. The measured content is Cu3.504%, Mn0.527%, Nd0.432%, Si<0.01%, Fe<0.01%, Ni<0.001%, which meet the requirements of element content, and stand for 1h after passing.

[0034] Using electromagnetic casting technology, the grains are refined by increasing the nucleation number. The electromagnetic frequency is 17Hz and the current is 95A.

[0035] The billet was repeatedly extruded 4 times before extrusion; the temperature of the furnace charge was controlled at 450°C, the temperature of the extrusion barrel was controlled at 480°C, and the extrusion ratio was controlled at 60.

[0036] The solid solution temperature of heat treatment is 530°C, the holding time is 8h, and the water transfer time does not exceed 5S; the ag...

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Abstract

The invention relates to magnesium alloy for a bicycle frame and a preparation method thereof. The magnesium alloy comprises the following elements in percentage by weight: 3 to 4 percent of Cu, 0.3 to 0.8 percent of Mn, 0.3 to 0.7 percent of Nd, less than 0.01 percent of Si, less than 0.01 percent of Fe, less than 0.001 percent of Ni, and the balance of Mg. The preparation method comprises the following steps of heating raw materials to 730 to 750 DEG C till the raw materials are molten, stirring by utilizing a stirrer, sampling and analyzing the samples; standing after the samples are qualified; casting; extruding; and thermally treating. The magnesium alloy maintains a majority of advantages of Mg-Mn alloy, the tensile strength and the yield strength are improved, the tensile strength is at least increased by one third compared with the tensile strength of the ordinary magnesium alloy, and the yield strength is at least increased by 50 percent; the fatigue resisting strength exceeds 150Mpa, the creep resistance is obviously enhanced; the magnesium alloy provided by the invention is easy to weld and is free of the weld seam crack tendency, has a compact metallic organization structure and is free from the segregation caused by the gathering of the manganese ions.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a magnesium alloy for a bicycle frame and a preparation method thereof. Background technique [0002] Magnesium alloy has a series of unique advantages such as low density, high specific strength and specific stiffness, good casting performance, electromagnetic shielding ability, and easy recycling. It is known as "the most promising and promising material in the 21st century". The domestic bicycle market is developing in the direction of sports, health, lightness and comfort. Magnesium alloy bicycles are lighter than aluminum alloy bicycles, which conforms to its development trend. However, the strength of the most widely used AZ31B magnesium alloy is generally only about 240Mpa, the damping coefficient is also low, and the shock absorption effect is poor. [0003] Mg-Mn series magnesium alloy is a kind of wrought magnesium alloy. It has good corrosion resistance and best weldability, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 翟慎宝王增委柴绍春王鲁东石宪柱
Owner 山东宏泰科技有限公司