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A kind of high energy absorption superfine grain magnesium alloy and preparation method thereof

A magnesium alloy and ultra-fine-grained technology, which is applied in the field of high-energy-absorbing ultra-fine-grained magnesium alloy and its preparation, can solve the problems of uneven deformation texture of magnesium alloy structure, poor plastic deformation ability of magnesium alloy, and reduced material ductility. Achieve the effects of eliminating internal stress, improving dynamic precipitation, and increasing the degree of recrystallization

Active Publication Date: 2021-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, high-energy-absorbing ultra-fine-grained magnesium alloys are usually prepared by severe plastic deformation processes such as equal-channel angular extrusion, high-pressure torsion, and repeated wrinkling-straightening. Due to the poor plastic deformation ability of magnesium alloys, severe plastic deformation processes will lead to There are problems such as uneven structure and strong deformation texture, which lead to a decrease in the ductility of the material, which in turn leads to a decrease in energy absorption performance

Method used

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  • A kind of high energy absorption superfine grain magnesium alloy and preparation method thereof
  • A kind of high energy absorption superfine grain magnesium alloy and preparation method thereof

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preparation example Construction

[0024] The invention provides a method for preparing a high-energy-absorbing ultrafine-grained magnesium alloy, which comprises the following steps:

[0025] (1) homogenize the as-cast magnesium alloy to obtain a homogenized magnesium alloy;

[0026] (2) Forging the homogenized magnesium alloy obtained in the step (1) at 440-530° C. to obtain a forged magnesium alloy;

[0027] (3) annealing the wrought magnesium alloy obtained in the step (2) to obtain an annealed magnesium alloy;

[0028] (4) Extruding the annealed magnesium alloy obtained in the step (3) at 100-150° C. to obtain a high-energy-absorbing ultrafine-grained magnesium alloy;

[0029] The high-energy-absorbing ultra-fine-grained magnesium alloy is a Mg-Mn-RE magnesium alloy or a Mg-Mn-Zn-based magnesium alloy; the sum of the mass percentages of Mn and RE / Zn in the high-energy-absorbing ultra-fine-grained magnesium alloy is Not more than 2%.

[0030] In the present invention, the high-energy-absorbing ultrafine-...

Embodiment 1

[0050] Step 1: Heating the pure magnesium ingot to 720°C in a protective gas atmosphere to melt, then adding Mg-Mn master alloy first in order, and finally adding Mg-Ce master alloy, cooling the melt to 700°C for semi-continuous casting, Obtain the as-cast magnesium alloy Mg-0.9Mn-0.5Ce, wherein the electromagnetic frequency is 40Hz, the casting speed is 160mm / min, and the cooling water volume is 16m 3 / h;

[0051] Step 2: Homogenize the as-cast magnesium alloy obtained in Step 1 at 500° C. for 24 hours to obtain a homogenized magnesium alloy:

[0052] Step 3: Forging the homogenized magnesium alloy obtained in Step 2 at 500° C. to obtain a forged magnesium alloy, wherein the forging is a single-pass deformation with a total deformation of 35%;

[0053] Step 4: annealing the wrought magnesium alloy obtained in step 3 at 430° C. for 1 hour to obtain an annealed magnesium alloy;

[0054] Step 5: extruding the annealed magnesium alloy obtained in the step 4 at 120°C, the extrus...

Embodiment 2

[0057] Step 1: Heat the pure magnesium ingot to 730°C for melting under protective gas atmosphere, then add the Mg-Mn master alloy first in order, and finally add the Mg-Nd master alloy, cool the melt down to 700°C for semi-continuous casting, Obtain the as-cast magnesium alloy Mg-0.9Mn-0.5Nd, wherein the electromagnetic frequency is 45Hz, the casting speed is 180mm / min, and the cooling water volume is 16m 3 / h;

[0058] Step 2: Homogenize the as-cast magnesium alloy obtained in Step 1 at 520° C. for 24 hours to obtain a homogenized magnesium alloy:

[0059] Step 3: Forging the homogenized magnesium alloy obtained in the step 2 at 500° C. to obtain a forged magnesium alloy, wherein the forging is single-pass deformation, and the total deformation is 40%;

[0060] Step 4: annealing the wrought magnesium alloy obtained in step 3 at 430° C. for 1.5 hours to obtain an annealed magnesium alloy;

[0061] Step 5: extruding the annealed magnesium alloy obtained in the step 4 at 120°...

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Abstract

The invention provides a method for preparing a high-energy-absorbing ultra-fine-grained magnesium alloy, comprising the following steps: homogenizing the as-cast magnesium alloy to obtain a homogenized magnesium alloy; heating the homogenized magnesium alloy at 440-530°C Forging to obtain a forged magnesium alloy; annealing the forged magnesium alloy to obtain an annealed magnesium alloy; extruding the annealed magnesium alloy at 100-150°C to obtain a high-energy-absorbing ultra-fine-grained magnesium alloy ; The high-energy-absorbing ultra-fine-grained magnesium alloy is a Mg-Mn-RE magnesium alloy or a Mg-Mn-Zn-based magnesium alloy; the mass percentage of Mn and RE / Zn in the high-energy-absorbing ultra-fine-grained magnesium alloy is and not more than 2%. The invention designs Mg-Mn-RE or Mg-Mn-Zn alloys with low alloying content, combines high-temperature forging and low-temperature extrusion processes, and utilizes dynamic precipitation, dynamic recrystallization and crystallization of solid solution atoms in low-temperature forming Boundary segregation and cluster behavior to achieve high energy absorption.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and in particular relates to a high-energy-absorbing ultrafine-grained magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, vibration damping, electromagnetic shielding and machining performance, and is an ideal material for lightweight structures. Magnesium alloy extruded pipe is an important bulk product form for the production of wrought magnesium alloy structural parts. It can be widely used in civil fields such as bicycles, wheelchairs, beach chairs, outdoor furniture, and sports equipment, as well as aerospace and military industries. [0003] The impact absorption energy of magnesium alloy under high-speed impact load is generally expressed by the area surrounded by its stress-strain curve. The greater the energy absorption, the stronger its ability to absorb energy and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C1/03C22C23/00C22C23/04B21J5/00
CPCB21J5/002C22C1/03C22C23/00C22C23/04C22F1/06
Inventor 杨续跃张宇修王春雨霍庆欢
Owner CENT SOUTH UNIV
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