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A high-plastic heat-resistant AZ series high-aluminum-magnesium alloy extrusion material and its preparation method

A technology for magnesium alloys and extruded materials, which is applied in the field of preparation of high-plastic heat-resistant AZ high-aluminum magnesium alloys and their extruded materials, can solve the problems of low elongation at room temperature, achieve improved elongation at room temperature, and improve Grain boundary structure state, extrusion process is simple and easy to implement

Active Publication Date: 2018-10-16
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the ZL201310085973.5 patent, a method of adding 0.2 to 1.5% Sm to the AZ80 magnesium alloy to improve its heat resistance was announced. Although the tensile strength can reach more than 300MPa at 150°C, the elongation at room temperature is low. Maximum 11%

Method used

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  • A high-plastic heat-resistant AZ series high-aluminum-magnesium alloy extrusion material and its preparation method
  • A high-plastic heat-resistant AZ series high-aluminum-magnesium alloy extrusion material and its preparation method
  • A high-plastic heat-resistant AZ series high-aluminum-magnesium alloy extrusion material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0027] In this embodiment, the extruded high plastic and heat-resistant AZ series high-aluminum-magnesium alloy consists of the following components in mass percentage: 9.0% Al, 0.7% Zn, 0.2% Mn, 0.4% Sm+0.05% La, and the balance is magnesium and unavoidable impurity elements.

[0028] Its preparation method is as follows:

[0029] Using a resistance melting furnace, in SF 6 with CO 2 Under the protective atmosphere of a mixed gas with a volume ratio of 1:100, heat Mg to 710°C to melt, add Al, Zn and Mn according to the mass percentage of the components, and use RJ-5 flux to purify and cover the magnesium alloy melt , according to the mass percentage of Sm and La, add Mg-30%Sm and Mg-25%La master alloy, heat up to 730°C, continue to add RJ-5 flux for refining and stirring after the alloy is melted, then let it stand for 9min, until the melt temperature When the temperature is lowered to 710°C, the slag is removed, and cast into a low-carbon steel mold preheated to 200°C und...

Embodiment 2

[0032] In this embodiment, the extruded high plastic and heat-resistant AZ series high-aluminum-magnesium alloy consists of the following components in mass percentage: 9.43% Al, 0.5% Zn, 0.1% Mn, 0.15% Sm+0.3% La, and the balance is magnesium and unavoidable impurity elements.

[0033] Its preparation method is identical with embodiment 1.

[0034] The XRD spectrum of the extruded material is attached Figure 5 As shown, the typical metallographic structure is as attached Figure 6 As shown, the SEM tissues are as attached Figure 7 shown. process it into Figure 4 The tensile samples shown were stretched at room temperature and 150°C on an Instron8032 stretching machine, and the stretching speed was 1mm / min. The tensile properties were shown in Table 1, and the average values ​​were: at room temperature, Tensile strength=330MPa, yield strength=180MPa, elongation=26%, yield strength ratio is 0.545; at high temperature (150°C), tensile strength=270MPa, yield strength=177M...

Embodiment 3

[0036] In this embodiment, the extruded high plastic and heat-resistant AZ series high-aluminum-magnesium alloy consists of the following components in mass percentage: 10.5% Al, 0.5% Zn, 0.12% Mn, 0.2% Sm+0.15% La, and the balance is magnesium and unavoidable impurity elements.

[0037] Its preparation method is identical with embodiment 1.

[0038] process it into Figure 4 The tensile samples shown were stretched at room temperature and 150°C on an Instron8032 stretching machine, and the stretching speed was 1mm / min. The tensile properties were shown in Table 1, and the average values ​​were: at room temperature, Tensile strength=333MPa, yield strength=182MPa, elongation=23%, yield strength ratio is 0.550; at high temperature (150°C), tensile strength=260MPa, yield strength=173MPa, elongation=33%, yield strength The ratio is 0.665.

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Abstract

The invention belongs to the field of metal material technologies and metallurgical technologies, and particularly relates to a high-plasticity heat-resisting AZ-series high-aluminum magnesium alloy extruded product and a preparation method thereof. According to the technical scheme, the high-plasticity heat-resisting AZ-series high-aluminum magnesium alloy extruded product comprises, by mass, 9.0%-11.0% of Al, 0.5%-1.0% of Zn, 0.1%-0.25% of Mn, 0.15%-0.55% of Sm and La, 0-0.05% (not including 0.05%) of impurity elements and the balance Mg, wherein the Sm content is 0.1%-0.5%, and the La content is 0.05%-0.4%. According to the high-plasticity heat-resisting AZ-series high-aluminum magnesium alloy extruded product and the preparation method thereof, based on AZ80 magnesium alloy, the Al content and microelement combination are increased, the rare earth elements of Sm and La are added, extrusion technological parameters are adjusted, and therefore the yield ratio of the magnesium alloy is lowered, and elongation and heat resistance of the magnesium alloy are improved.

Description

technical field [0001] The invention belongs to the field of metal material technology and metallurgy technology, and in particular relates to a high-plasticity heat-resistant AZ series high-aluminum-magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is an ideal material for lightweight structure. It has the advantages of low density, high specific strength, easy recycling, and excellent vibration damping, electromagnetic shielding and machining performance. It is widely used in automotive, aerospace, 3C, national defense and other fields. The application has broad application prospects. At present, industrial general-purpose magnesium alloys are mainly divided into two categories: cast magnesium alloys and deformed magnesium alloys. Deformed magnesium alloys can be obtained by forging, extrusion, rolling and other processes. Compared with cast magnesium alloys, they have higher strength and better performance. Extensibility and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/02C22F1/06
CPCC22C1/02C22C23/02C22F1/06
Inventor 乐启炽付丽王熙博构培丽李丹唐岩
Owner NORTHEASTERN UNIV LIAONING
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