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Preparation method of ultrahigh-strength nano heterogeneous magnesium alloy

A magnesium alloy, ultra-high-strength technology, applied in the field of ultra-high-strength nano-heterogeneous magnesium alloy preparation, can solve problems such as lack of methods, achieve high strain rate, reduce cracking tendency, and improve the effect of total deformation

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 nano-heterogeneous magnesium alloys are scarce, and continue to develop new methods for preparing nano-heterogeneous magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. The magnesium alloy ingot is prepared by semi-continuous casting, and homogenized heat treatment is carried out;

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

[0020] c. The extruded bar is subjected to rotary forging deformation at 25°C, the deformation of each pass is 10%, 10%, 20%, the total deformation is 35%, the feed rate is controlled at 5mm / min, and after every 2 passes of deformation Changing the feeding direction, the obtained nano-heterogeneous magnesium alloy grain size is 30nm~2μm, and the finished product size is 20mm in diameter and 2000mm 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-heterogeneous magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 2

[0024] a. The magnesium alloy ingot is prepared by semi-continuous casting, and homogenized heat treatment is carried out;

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

[0026] c. The extruded bar is subjected to swaging deformation at 150°C, the deformation of each pass is 10%, 10%, 10%, the total deformation is 27%, the feed rate is controlled at 5mm / min, and after every 2 passes of deformation Changing the feeding direction, the obtained nano-heterogeneous magnesium alloy grain size is 50nm~2μm, and the finished product size is 30mm 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-heterogeneous magnesium alloy were tested, and the results are shown in Table 1.

Embodiment 3

[0030] a. The magnesium alloy ingot is prepared by semi-continuous casting, and homogenized heat treatment is carried out;

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

[0032] c. The extruded bar was subjected to rotary forging deformation at 200°C. The deformation of each pass was 10%, 20%, and 15%, respectively, and the total deformation was 39%. The feed rate was controlled at 5mm / min. After every 2 passes of deformation Changing the feeding direction, the grain size of the obtained nano-heterogeneous magnesium alloy is 70nm~1μm, and the finished product size is 14mm 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-heterogeneous 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 nano heterogeneous magnesium alloy. The preparation method includes the steps of squeezing magnesium alloy semi-continuously-castedingot blanks into bars after uniform treatment, subjecting the squeezed bars to rotary swaging deformation, controlling the rotary swaging temperature at 0-400 DEG C, controlling pass deformation at 10-20% and total deformation at 5-80%, controlling the feeding speed at 3-8 mm / min, changing the feeding direction after two-time pass deformation, and obtaining the nano heterogeneous magnesium alloy3-30 mm in diameter, 1000-2000 mm in length and 30 nanometers-2 micrometers in grain size. After later heat treatment, the room-temperature tensile strength of the alloy is larger than or equal to 580MPa, the yield strength is larger than or equal to 470 MPa, and the percentage elongation after fracture is larger than or equal to 6%.

Description

technical field [0001] The invention belongs to the field of preparation of ultra-high-strength magnesium alloys, in particular to a preparation method of ultra-high-strength nano-heterogeneous 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. 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-high-strength magnesium alloys are important goals of magnesium alloy research. Nano-heterogeneous metal materials are an effective strengthening method for metal material...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 万迎春刘楚明郭学益陈志永
Owner CENT SOUTH UNIV
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