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Preparation method of VW93M super-high-strength large block body nano magnesium alloy

A technology of nano-magnesium and magnesium alloys, which is applied in the field of bulk nano-material preparation and can solve problems such as lack of methods

Inactive Publication Date: 2018-11-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for preparing bulk nano-magnesium alloys are scarce, and it is urgent to develop new methods for preparing bulk nano-magnesium alloys.

Method used

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  • Preparation method of VW93M super-high-strength large block body nano magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0019] b. Extruding and deforming the homogenized alloy billet;

[0020] c. The extruded bar is subjected to rotary forging deformation at 125°C, and the deformation amount of each pass is controlled to be 15%, 15%, 10%, and the total deformation amount is 35%, and the feeding speed is controlled to be 2mm / min. In the feeding direction, the average grain size of the obtained nano-magnesium alloy is 30nm, and the finished product size is 3.5mm in diameter and 1500mm in length;

[0021] d. The swaged bar is subjected to aging heat treatment.

[0022] According to GB / T228-2002, the mechanical properties of the obtained nano-magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 2

[0024] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0025] b. Extruding and deforming the homogenized alloy billet;

[0026] c. The extruded bar is subjected to swaging deformation at 150°C, the deformation of each pass is controlled at 10%, 15%, 10%, 10%, the total deformation is 38%, and the feeding speed is controlled at 2mm / min. After the deformation, the feeding direction is changed, and the average grain size of the obtained nano-magnesium alloy is 50nm, and the finished product size is 5mm in diameter and 2000mm in length;

[0027] d. The swaged bar is subjected to aging heat treatment.

[0028] According to GB / T228-2002, the mechanical properties of the obtained nano-magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 3

[0030] a. The mass percentage composition of the magnesium alloy is: Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, the magnesium alloy ingot is prepared by a semi-continuous casting method, and homogenized heat treatment is performed;

[0031] b. Extruding and deforming the homogenized alloy billet;

[0032] c. The extruded bar is subjected to rotary forging deformation at 200°C, and the deformation amount of each pass is controlled to be 15%, 15%, 15%, and the total deformation amount is 39%, and the feeding speed is controlled to be 3mm / min. In the feeding direction, the average grain size of the obtained nano-magnesium alloy is 70nm, and the finished product size is 3mm in diameter and 1000mm in length;

[0033] d. The swaged bar is subjected to aging heat treatment.

[0034] According to GB / T228-2002, the mechanical properties of the obtained nano-magnesium alloy were tested, and the results are shown in Table 1.

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Abstract

The invention relates to a preparation method of VW93M super-high-strength large block body nano magnesium alloy. The magnesium alloy is prepared from the following ingredients by mass percent: Mg, 8.0-9.6% of Gd, 1.8-3.2% of Y, 0.3-0.7% of Zr, 0.02-0.5% of Ag and 0.02-0.3% of Er, and the method comprises the following steps of enabling a semicontinuous casting ingot blank of the magnesium alloy to be subjected to homogenization treatment, then squeezing to form a bar, enabling the squeezed bar to be subjected to rotary forging deformation, controlling rotary forging temperature at 100-300 DEGC, controlling pass deformation amount to be 5-20% and total deformation amount to be 20-80%, controlling feed rate to be 2-6mm / min, changing feed directions after each pass deformation to prepare the nano magnesium alloy of which the diameter is 3-7mm, the length is 1,000-2,000mm and the average grain sizes are 30-100nm. For the alloy which is combined with subsequent thermal treatment, the tensile strength at room temperature is greater than or equal to 710MPa, the yield strength is greater than or equal to 650MPa, and the elongation percentage after fracture is greater than or equal to 5%.

Description

technical field [0001] The invention relates to the field of preparation of bulk nanomaterials, in particular to a preparation method of ultra-high-strength block nano-magnesium alloys. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, and high damping. As a new generation of lightweight structural materials, its excellent weight reduction characteristics are of great significance to aerospace, transportation and other fields. my country's magnesium resources are extremely rich, and its wide application will help my country give full play to its resource advantages and further enhance its international discourse power. However, the mechanical properties of existing magnesium alloys are relatively low, and it is difficult to meet the demand for high-performance materials in aerospace and other fields. Therefore, improving the strength of magnesium alloys and preparing high-strength or even ultra-h...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明高永浩蒋树农
Owner CENT SOUTH UNIV
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