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A kind of preparation method of multi-scale precipitation strengthening magnesium alloy material

A precipitation-strengthening, multi-scale technology is applied in the field of preparing large multi-scale precipitation-strengthening magnesium alloys, which can solve the problems of poor deformation ability, grain size growth, and limited application of magnesium alloys, achieving good heat resistance and simple process. , the effect of great flexibility

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor deformation ability of magnesium alloy itself, the preparation of lamellar magnesium alloy by high-pressure torsion needs to be carried out at high temperature, and there are the following technical problems: (1) it is difficult to control the oxidation of the interface; (2) high temperature is easy to make the grain The size grows, and it is impossible to obtain nanoscale or submicron grains; (3) The size of the sample obtained by high-pressure torsion is too small, and the requirements for equipment and molds are very high; (4) The strength of layered multi-scale materials Toughening performance has obvious directionality, which limits its application in many parts that require multi-directional force
However, the mixed crystal material prepared in this way has a single component and poor heat resistance

Method used

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  • A kind of preparation method of multi-scale precipitation strengthening magnesium alloy material
  • A kind of preparation method of multi-scale precipitation strengthening magnesium alloy material
  • A kind of preparation method of multi-scale precipitation strengthening magnesium alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Under the argon protective gas atmosphere of the vacuum glove box 1, use the micro milling machine 2 to prepare the chips of Mg-3Y and Mg-8Y alloys, and the milling feed is 0.3mm, and the thickness is about 0.3mm. coarse crumbs. The micro-crusher 3 is used to finely crush the milled coarse chips to reduce and uniform the length of the chips to 0.3-0.5 mm for later use.

[0026] (2) In the glove box 1, the Mg-3Y and Mg-8Y chips were mechanically mixed by vibrating, stirring, and shaking with the agitator 4. The mixing time was 30 minutes, and the operating frequency was 50 Hz. After the mixed chips are completed, fill the steel pressing mold 5, and the cavity size is round. Use the micro-press 6 to carry out pre-compression molding on the debris, the pressure is 40MPa, the holding time is 10 minutes, and the relative density of the obtained prefabricated block 7 is about 80%. After the pressing is completed, the samples are vacuum-packaged and taken out of the gl...

Embodiment 2

[0030] (1) Under the argon protective gas atmosphere of the vacuum glove box 1, use the micro-milling machine 2 to prepare the chips of Mg-5Y and Mg-11Y alloys, the milling feed is 0.3mm, and the thickness is about 0.3mm. coarse crumbs. The micro-crusher 3 is used to finely crush the milled coarse chips to reduce and uniform the length of the chips to 0.3-0.5 mm for later use.

[0031] (2) In the glove box 1, the Mg-5Y and Mg-11Y chips were mechanically mixed by vibrating, stirring, and shaking with the agitator 4. The mixing time was 30 minutes, and the operating frequency was 50 Hz. After the mixed chips are completed, fill the steel pressing mold 5, and the cavity size is round. Use the micro-press 6 to carry out pre-compression molding on the debris, the pressure is 40MPa, the holding time is 10 minutes, and the relative density of the obtained prefabricated block 7 is about 80%. After the pressing is completed, the samples are vacuum-packaged and taken out of the glov...

Embodiment 3

[0035] (1) Under the argon protective gas atmosphere of the vacuum glove box 1, use the micro milling machine 2 to prepare the chips of three alloys of Mg-5Y, Mg-8Y and Mg-11Y, and the milling feed is 0.3mm to obtain the thickness Coarse chips of about 0.3mm. The micro-crusher 3 is used to finely crush the milled coarse chips to reduce and uniform the length of the chips to 0.3-0.5 mm for later use.

[0036] (2) Mechanically mix the Mg-5Y, Mg-8Y and Mg-11Y debris with the agitator 4 in the glove box 1 by vibrating, stirring, and shaking. The mixing time is 30 minutes, and the operating frequency is 50 Hz. After the mixed chips are completed, fill the steel pressing mold 5, and the cavity size is round. Use the micro-press 6 to carry out pre-compression molding on the debris, the pressure is 40MPa, the holding time is 10 minutes, and the relative density of the obtained prefabricated block 7 is about 80%. After the pressing is completed, the samples are vacuum-packaged and ...

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Abstract

A method for preparing a multi-scale precipitation-strengthened magnesium alloy, including: chip making, chip mixing, pre-compaction, extrusion, multi-scale precipitation and other processes, characterized in that two or more magnesium materials with different age hardening behaviors are selected Alloys, after fully mixing their debris, undergo thermoplastic deformation, and obtain dense, multi-alloy composition-scale mixed billets through mechanical alloying of high-temperature, high-strain aging debris. Through the aging heat treatment, the multi-scale precipitation of the heterogeneous magnesium alloy material occurs, and the high-strength and high-toughness magnesium alloy material with excellent comprehensive properties is obtained.

Description

technical field [0001] The invention relates to the preparation technology of multi-scale precipitation-strengthened magnesium alloy, specifically a technology for preparing large-scale multi-scale precipitation-strengthened magnesium alloy through the method of mixing dissimilar debris, combined with specific plastic deformation and heat treatment to control the microstructure. Background technique [0002] Magnesium alloy is currently the lightest metal structure material in practical application, and it is being increasingly widely used in the fields of national defense, aerospace, automobile, electronic communication and so on. Compared with other light metal structural materials such as aluminum alloys and titanium alloys, magnesium alloys have poorer strength and toughness. A large number of studies have shown that adding rare earth alloy elements and introducing precipitation strengthening is one of the most effective strengthening mechanisms for magnesium alloys. Ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C23/00C22F1/06
Inventor 周浩陈雪飞其他发明人请求不公开姓名
Owner NANJING UNIV OF SCI & TECH