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Novel non-rare earth cast magnesium alloy and preparation method thereof

A technology of casting magnesium alloy and non-rare earth, which is applied in the field of metal materials and metallurgy, can solve the problems of poor alloy casting performance, difficulty in commercialization and application, and high cost, and achieves improved strength and plasticity, low price, and high production efficiency Effect

Active Publication Date: 2015-12-16
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing high-strength cast magnesium alloys, such as using a variety of high rare earth elements or high-priced alloy elements, resulting in high cost, high density, and poor casting performance of the alloy so that it is difficult to commercialize and apply it. A novel non-rare earth casting magnesium alloy and a preparation method thereof are provided. The magnesium alloy is a novel Mg-Bi-Zr-Zn magnesium alloy, and Zr element is added in the form of Mg-Zr master alloy during the smelting process to make Zr Elements can be easily added to the alloy, so that it has a strong refining effect in the Mg-Bi alloy, so that the magnesium alloy has excellent comprehensive mechanical properties, and the cost of raw materials and processing is low, and it is easy to achieve mass production

Method used

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  • Novel non-rare earth cast magnesium alloy and preparation method thereof
  • Novel non-rare earth cast magnesium alloy and preparation method thereof
  • Novel non-rare earth cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Take raw materials by the mass percent of alloy Mg-3.8Bi-0.7Zr-1.0Zn (wt%): pure Bi, pure Zn, Mg-20Ca, all the other are Mg (per 1000 grams of target alloy can be made of 35 grams of Mg-20Zr, 10g of Zn, 38g of Bi and 917g of Mg); and do a good job of surface treatment of raw materials (such as removing dirt, scale, etc.).

[0036] ② First clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, heat slowly, the heating rate is 20-40°C / min, Hold after reaching the set temperature.

[0037] ③ After the pure magnesium ingots are completely melted, add pure bismuth, pure zinc and Mg-20Zr master alloy preheated to about 200°C.

[0038] ④Raise the furnace temperature to 740°C, keep it warm for 10-15 minutes, and stir for 2-5 minutes to make all alloy elements evenly distributed in the magnesium alloy melt (this temperature is to make the Zr element fully melt ...

Embodiment 2

[0042] 1. take raw materials by the mass percent of alloy Mg-6.0Bi-0.7Zr-1.0Zn (wt%): pure Bi, pure Zn, Mg-20Ca, all the other are Mg; oxide skin, etc.).

[0043] ② First clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, and heat slowly at a heating rate of 20-40°C / min. Hold after reaching the set temperature.

[0044] ③ After the pure magnesium ingots are completely melted, add pure bismuth, pure zinc and Mg-20Zr master alloy preheated to about 200°C.

[0045] ④Raise the furnace temperature to 740°C, keep it warm for 10-15 minutes, and stir for 2-5 minutes to make all alloy elements evenly distributed in the magnesium alloy melt (this temperature is to make the Zr element fully melt into the alloy melt middle).

[0046] ⑤ Afterwards, adjust the furnace temperature to 720°C, keep it warm for 8-10 minutes, skim off the scum on the surface of the melt, then...

Embodiment 3

[0049] 1. take raw material by the mass percent of alloy Mg-7.0Bi-0.7Zr-1.0Zn (wt%): pure Bi, pure Zn, Mg-20Ca, all the other are Mg; oxide skin, etc.).

[0050] ② First clean the melting furnace and heat it to 450°C, put the magnesium ingot preheated to 200°C into the crucible of the melting furnace, set the furnace temperature to 720°C, heat slowly, the heating rate is 20-40°C / min, Hold after reaching the set temperature.

[0051] ③ After the pure magnesium ingots are completely melted, add pure bismuth, pure zinc and Mg-20Zr master alloy preheated to about 200°C.

[0052] ④ Raise the temperature of the furnace to 740°C, keep it warm for 10-15 minutes, and then stir for 2-5 minutes to make all the alloying elements evenly distributed in the magnesium alloy melt.

[0053] ⑤ Afterwards, adjust the furnace temperature to 720°C, keep it warm for 8-10 minutes, skim off the scum on the surface of the melt, then pour it into a mold, cool and solidify, and obtain the required magn...

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Abstract

The invention provides a novel non-rare earth cast magnesium alloy. The alloy is an Mg-Bi-Zr-Zn alloy and comprises the following components by weight percent: 0.5-8wt% of Bi, 0.35-1.0wt% of Zr, 0.1-2.0wt% of Zn and the balance of Mg. The novel non-rare earth cast magnesium alloy has the beneficial effects that the obvious grain refinement effect of the element Zr in an Mg-Bi alloy series is found on the basis of Mg-Bi, thus improving the strength and plasticity of the alloy; the strength of the alloy is improved in an auxiliary manner by using a small quantity of the element zinc, thus developing the high-strength cast magnesium alloy from the alloy series; the yield strength is 140-155MPa; the tensile strength is 245-285MPa; and the elongation is about 6.5%.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a low-cost non-rare earth cast magnesium alloy and a preparation method thereof, which belong to the field of metal materials and metallurgy; the new magnesium alloy can be used as a potential heat-resistant magnesium alloy and Biomedical magnesium alloy materials. Background technique [0002] Magnesium alloy is the lightest metal structure material. It has many advantages such as high specific strength, high specific stiffness, good electromagnetic shielding performance, excellent casting performance, easy cutting and easy recycling, and has been widely used. Among the existing applications of magnesium alloys, cast magnesium alloys account for more than 90%, and are mainly used in automobiles, aircraft, 3C products and military fields to meet the requirements of weight reduction, noise absorption, shock absorption and radiation protection. In the automotiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03
Inventor 余晖孟帅举秦春玲王志峰赵维民
Owner HEBEI UNIV OF TECH
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