Preparation method of ultrahigh-strength blocky Mg-Gd-Y-Zr nano magnesium alloy

A technology of nano-magnesium and magnesium alloys, which is applied in the field of bulk nano-material preparation, can solve problems such as lack of methods, and achieve the effects of high strain rate, increased total deformation, and high hydrostatic stress.

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 continue to develop new methods for preparing bulk nano-magnesium alloys

Method used

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  • Preparation method of ultrahigh-strength blocky Mg-Gd-Y-Zr 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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

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

[0020] c. The extruded bar is subjected to rotary forging deformation at 25°C, the deformation of each pass is controlled at 15%, 15%, 10%, the total deformation is 35%, the feed rate is controlled at 2mm / min, and the deformation is changed after each pass 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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

[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 used is Mg-8Gd-3Y-0.4Zr, the magnesium alloy ingot is prepared by a semi-continuous casting method, and the homogenization heat treatment is carried out;

[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 4mm / 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 ultrahigh-strength blocky Mg-Gd-Y-Zr nano magnesium alloy. Mg, Gd, Y and Zr of the magnesium alloy are in a mass ratio of 1:(7 to 9):(2.5 to 3.5):(0.2to 0.45). The preparation method includes the steps of squeezing magnesium alloy semi-continuously-casted ingot blanks into bars after uniform treatment, subjecting the squeezed bars to rotary swagingdeformation, controlling the rotary swaging temperature at 0-250 DEG C, controlling pass deformation at 5-20% and total deformation at 20-60%, controlling the feeding speed at 2-6 mm / min, changing the feeding direction after each pass deformation, and obtaining the nano magnesium alloy 3-7 mm in diameter, 1000-2000 mm in length and 30-100 nm in average grain size. After later heat treatment, theroom-temperature tensile strength of the alloy is larger than or equal to 700 MPa, the yield strength is larger than or equal to 650 MPa, and the percentage elongation after fracture is larger than orequal 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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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明蒋树农陈志永
Owner CENT SOUTH UNIV
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