A kind of magnesium alloy and preparation method thereof

A magnesium alloy and master alloy ingot technology, applied in the field of metal materials, can solve problems such as imperfect research and development, limited application range, limited strength and toughness, etc., and achieve the goals of reducing hot cracking sensitivity, strong versatility, and improving comprehensive mechanical properties Effect

Active Publication Date: 2017-10-17
WEIHAI WANFENG MAGNESIUM IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Mg-Al alloy is currently the most widely used die-casting magnesium alloy, but its strength and toughness are limited, which limits its application to a certain extent.
At present, among the commonly used Mg-Al series casting alloys, AZ91 is the most commonly used magnesium alloy. It has high strength and excellent casting performance. It is mostly used in motorcycles, computer accessories, casings, covers, and shells of household appliances, etc. , but its plasticity is poor, and the elongation rate is only 3%; the AM50 or AM60 alloy with better plasticity is used in occasions with high impact load resistance and high safety, such as wheels, car doors, etc., but the strength of this alloy is low
Magnesium alloys AS41, AS21 of the AS series and AFA2 of the AE series are heat-resistant die-casting magnesium alloys developed in the 1970s. They have good heat resistance due to containing silicon and rare earths, but their fluidity is poor and the cost is relatively high. high, so that its application is less
Furthermore, although rare earth elements have a unique arrangement of extranuclear electrons, which can purify the alloy liquid, improve the alloy structure, improve the mechanical properties of the alloy at room temperature and high temperature, and enhance the corrosion resistance of the alloy, etc., there are many types of rare earth elements, and the current research and development are also Imperfection also limits its development

Method used

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  • A kind of magnesium alloy and preparation method thereof
  • A kind of magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The industrial magnesium alloy AM50 is selected as the master alloy, the alloy is preheated to 150 ° C, and the sulfur hexafluoride SF 6 and N 2 Melt under the protection of mixed gas, raise the temperature to 720°C, preheat pure Al, pure Sn and Mg-Nd intermediate alloys and add them directly into the melt, stir and mix evenly, let stand for 10 minutes, and then put them in the metal mold Pouring in the mould. The poured castings were solid solution treated in a resistance crucible furnace at 410°C for 8 hours.

[0023] The composition of the casting obtained is shown in the following table (mass percentage):

[0024] sn

[0025] The tensile strength at room temperature is 249.6MPa, the yield strength is 168.9MPa, and the elongation is 9.5%.

Embodiment 2

[0027] Select the industrial magnesium alloy AM50 as the master alloy, preheat the alloy to 180°C, and 6 and N 2 Melt under the protection of mixed gas, raise the temperature to 720°C, preheat pure Al, pure Sn and Mg-Nd intermediate alloys and add them directly into the melt, stir and mix evenly, let stand for 15 minutes, and then place them in the metal mold Pouring in the mould. The poured castings were solid solution treated in a resistance crucible furnace at 410°C for 9 hours.

[0028] Obtain the composition of casting as follows (mass percentage):

[0029]

[0030] The tensile strength at room temperature is 235.8MPa, the yield strength is 154.7MPa, and the elongation is 10.8%.

Embodiment 3

[0032] Select the industrial magnesium alloy AM50 as the master alloy, preheat the alloy to 200°C, and 6 and N 2 Melt under the protection of mixed gas, raise the temperature to 720°C, preheat pure Al, pure Sn and Mg-Nd master alloy and add it directly into the melt, stir and mix evenly, let it stand for 20 minutes, and then put it in the metal mold Pouring in the mould. The poured castings were solid solution treated in a resistance crucible furnace at 410°C for 10 hours.

[0033] Obtain the composition of casting as follows (mass percentage):

[0034]

[0035] The tensile strength at room temperature is 242.2MPa, the yield strength is 161.7MPa, and the elongation is 10.0%.

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Abstract

The invention discloses a magnesium alloy and a preparation method thereof. On the basis of total mass of the magnesium alloy, the magnesium alloy contains the following components in percentage by weight: 6.0-7.0wt% of Al, 0.8-1.2wt% of Sn, 0.6-1.0wt% of Nd, 0.2-0.4wt% of Mn, 0-0.02wt% of Zn and the balance of magnesium. Through adding a proper amount of metals Sn, Nd and Al on the basis of the AM50 alloy, the performance of the alloy is improved, so that the magnesium alloy has relatively good room-temperature toughness, so as to meet the requirements of industrial field.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys are lightweight materials in the 21st century. Magnesium alloys have light specific gravity, high specific strength and specific stiffness, good damping, thermal conductivity, machinability and castability, and also have strong electromagnetic shielding ability and rich resources. With a series of advantages such as easy recycling and easy recycling, its development and application have attracted more and more attention, and it has become one of the "youngest" metal structural materials, and is widely used in the fields of automobiles, aviation and electronic equipment. Since the 1990s, the demand for magnesium alloys in the world has been increasing, especially the energy-saving and environmental protection issues of automobiles, which have made magnesium alloys with li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 朱训明王爱民徐国松薛冰奇
Owner WEIHAI WANFENG MAGNESIUM IND DEV
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