Preparing method of high-thermal-stability VW93M nanometer magnesium alloy

A technology of high thermal stability and nano-magnesium, which is applied in the field of preparation of high-thermal-stability nano-magnesium alloys, can solve the problems of grain growth and poor thermal stability of nanostructured materials, and achieve the effect of increasing dislocation density

Inactive Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with coarse-grained materials, the thermal stability of nanostructured materials is generally poor, and even some grains grow at room temperature, so that nanomaterials cannot maintain good mechanical and physical and chemical properties at higher temperatures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The VW93M alloy bar was subjected to rotary forging deformation at 100°C, the amount of deformation in each pass was controlled to be 10%, 15%, and 15%, and the total deformation amount was 35%, and the feed rate was controlled to be 3mm / min. Change the feeding direction, oil lubrication is used in the swaging process, and the lubricant flow rate is 1m 3 / h, after swaging, anneal the obtained nano-magnesium alloy at 130°C for 20h.

[0016] The concentration of Gd and Y elements at the grain boundary of the obtained nano-magnesium alloy is 2.1 times that in the grain, and the grain growth temperature is 0.62T m .

Embodiment 2

[0018] The VW93M alloy bar was subjected to rotary forging deformation at 150°C, the deformation of each pass was controlled to be 10%, 15%, 10%, and 10%, the total deformation was 38%, and the feeding speed was controlled to be 5mm / min. Change the feeding direction after the first deformation, oil lubrication is used in the rotary forging process, and the lubricant flow rate is 1.5m 3 / h, the obtained nano-magnesium alloy was annealed at 150°C for 15h after swaging.

[0019] The concentration of Gd and Y elements at the grain boundary of the obtained nano-magnesium alloy is 2.3 times that in the grain, and the grain growth temperature is 0.63T m .

Embodiment 3

[0021] The VW93M alloy bar was subjected to rotary forging deformation at 200°C, the deformation of each pass was controlled to be 15%, 15%, 10%, and 10%, the total deformation was 41%, and the feed rate was controlled to be 6mm / min. Change the feeding direction after the first deformation, oil lubrication is used in the rotary forging process, and the lubricant flow rate is 1.5m 3 / h, after swaging, the nano-magnesium alloy was annealed at 140°C for 12h.

[0022] The concentration of Gd and Y elements at the grain boundary of the obtained nano-magnesium alloy is 2.5 times that in the grain, and the grain growth temperature is 0.62T m .

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PUM

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Abstract

The invention relates to a preparing method of a high-thermal-stability VW93M nanometer magnesium alloy. A VW93M alloy bar is subject to rotary forging deformation to prepare the nanometer magnesium alloy, the rotary forging temperature is controlled to range from 100 to 300 DEG C, the pass deformation amount is controlled to range from 5 to 20%, the total deformation amount ranges from 20 to 60%,the feeding speed is controlled to range from 3 to 8 mm/min, after each-pass deforming, the feeding direction is changed, in the rotary forging process, oil is adopted for lubricating, the flowing rate of a lubricating agent ranges from 0.5 to 1.5 m<3>/h, after rotary forging, the obtained nanometer magnesium alloy is subject to annealing for 8 to 14 h at the temperature of 150 to 200 DEG C, Gd and Y are subject to segregation on the nanocrystalline boundary, the concentration of Gd and Y on the nanometer magnesium alloy crystal boundary is 2 to 2.5 times that of Gd and Y in the crystal, andthe crystal particle growth temperature of the nanometer magnesium alloy is larger than or equal to 0.62 Tm.

Description

technical field [0001] The invention relates to the field of preparation of bulk nanometer materials, in particular to the preparation technology of high thermal stability nanometer magnesium alloy. 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. Nano-magnesium alloys have ultra-high strength, which can meet the demand for high-performance magnesium alloys in high-precision fields. However, compared with coarse-grained materials, the thermal stability of nanostructured materials is generally poor, and even some grains grow at room temperature, so that nanomaterials cannot maintain good mechanical and physical and chemical properties at higher temperatures. The preparation of nano-magnesium alloys with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 万迎春刘楚明高永浩蒋树农余世伦陈永志
Owner CENT SOUTH UNIV
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