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Preparation method of bimodal tissue Mg-6Zn-0.45Zr alloy

A dual-modal, alloying technology is applied in the field of bimodal Mg-6Zn-0.45Zr alloy preparation, which can solve the problem of low microstructure repeatability and achieve consistent results.

Inactive Publication Date: 2018-08-14
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obtaining a dual-mode structure is an effective method for preparing high-strength and high-toughness materials, but it is still relatively seldom used in the preparation of high-strength and high-toughness magnesium alloys, and the dual-mode structures obtained by existing methods are mostly randomly distributed grains, and the structure repeatability not tall

Method used

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  • Preparation method of bimodal tissue Mg-6Zn-0.45Zr alloy
  • Preparation method of bimodal tissue Mg-6Zn-0.45Zr alloy
  • Preparation method of bimodal tissue Mg-6Zn-0.45Zr alloy

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Experimental program
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Embodiment 1

[0032] The Mg-6Zn-0.45Zr alloy selected in this embodiment has a length, width and height of 35mm, 35mm and 40mm respectively before processing.

[0033] A method for preparing a dual-mode structure Mg-6Zn-0.45Zr alloy, comprising the following steps:

[0034] 1) Heat treatment process: put the sample in an iron box and cover it with graphite-containing sand, put it in a heat treatment furnace for heating and heat preservation, set the heating temperature at 330°C, and keep it warm for 10 hours after reaching the set temperature, so that the continuous network distribution The second phase of the alloy basically dissolves into the matrix, and the sample is taken out and air-cooled, so that the second phase does not have time to precipitate, and a single-phase solid solution with basically uniform properties is obtained. The microstructure of the alloy before and after heat treatment is as follows: figure 1 , figure 2 shown;

[0035] 2) Thermal processing heating process: be...

Embodiment 2

[0039] The difference between embodiment 2 and embodiment 1 lies in that the size of the samples is different, and the length, width and height of the samples before processing are 70 mm, 70 mm, and 80 mm, respectively.

[0040] After thermal processing, the surface of the sample material is good, without obvious cracks, and without obvious macroscopic loss.

Embodiment 3

[0042] The difference between embodiment 3 and embodiment 1 and embodiment 2 lies in that the size of the samples is different, and the length, width and height of the samples before processing are 140 mm, 140 mm, and 140 mm, respectively.

[0043] The surface of the sample after thermal processing is good, with no obvious cracks and no obvious macro loss.

[0044] The microstructure and mechanical properties of the dual-mode magnesium alloy obtained in Examples 1-3 are analyzed below in combination with the experimental data.

[0045] 1. Microstructure characterization: Select the core of the sample in Example 1-3 to prepare a microstructure observation sample. After mounting, pre-grinding, polishing, and corrosion, the MM6 horizontal metallographic microscope is used to observe the corroded sample. The plane of observation is vertical In the forging direction before sampling, the microstructure and morphology are as follows: Figure 4-Figure 7 and Figure 9-Figure 13 shown...

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Abstract

The invention discloses a preparation method of a bimodal tissue Mg-6Zn-0.45Zr alloy. The method comprises alloy heat treatment and alloy hot working, wherein the preservation temperature of the alloyheat treatment is 330 + / -5 DEG C, the heat preservation time of the alloy is 10 + / -0.5 hours, and the cooling mode is air cooling; and the temperature of the alloy hot working is 250 + / -5 DEG C, theheat preservation time before the alloy hot working is 10 + / -1 minutes, the alloy hot working mode adopts small-pass strain high-strain-rate three-direction forging, the forging equipment is an air hammer, secondary heating is not repeated among the passes, the pass strain capacity is 10 + / -0.5%, the deformation pass is 24 passes, and the cooling mode is the air cooling. According to the preparation method, the bimodal tissue Mg-6Zn-0.45Zr alloy with controllable crystalline grain distribution can be prepared, and the bimodal tissue Mg-6Zn-0.45Zr alloy has excellent comprehensive mechanical properties; the temperature drop caused by heat dissipation is made up by utilizing the temperature rise effect of high-speed deformation, no heating is needed among the passes, and the method is shortin machining period and is suitable for producing large-size block body of the Mg-6Zn-0.45Zr alloy.

Description

technical field [0001] The invention relates to a method for preparing a Mg-6Zn-0.45Zr alloy, in particular to a method for preparing a Mg-6Zn-0.45Zr alloy with a dual-mode structure. Background technique [0002] Magnesium alloy is the lightest metal structure material with high specific strength, high specific stiffness, good vibration damping ability, excellent thermal conductivity and electrical conductivity, good dimensional stability, electromagnetic shielding and easy recycling. In recent years, with the increasingly prominent energy and environmental issues, magnesium alloys have rapidly emerged as new engineering materials, and have gradually become ideal substitutes for engineering materials such as aluminum alloys, steel, and engineering plastics. Electrical appliances and other fields have important application value and broad application prospects. [0003] However, the low strength of magnesium alloys and the lag in the development of high-strength magnesium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22F1/06
CPCC22C23/04C22F1/06
Inventor 吴远志周小桃李庆芬刘伟邓彬叶拓
Owner HUNAN INST OF TECH
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