Preparation method for low rare earth nanometer magnesium alloy with high thermal stability

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 atomic percentage composition of the magnesium alloy used is Mg-1.36Gd-1.03Y-0.13Zr, and the alloy bar is subjected to swaging deformation at 100 °C, and the deformation of each pass is controlled to be 10%, 15%, and 15%, respectively, and the total deformation is 35%, the control feeding speed is 5mm / min, the feeding direction is changed after each pass of deformation, the swaging process is lubricated with oil, and the lubricant flow speed is 1.5m 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 1.8 times that in the crystal, and the grain growth temperature of the obtained nano-magnesium alloy is 0.64T m .

Embodiment 2

[0018] The atomic percentage composition of the magnesium alloy used is Mg-1.09Gd-0.69Y-0.14Zr, and the alloy bar is subjected to swaging deformation at 150 °C, and the deformation of each pass is controlled to be 10%, 15%, 10%, and 10%, respectively. The amount of deformation is 38%, the feeding speed is controlled at 2mm / min, and the feeding direction is changed after each pass of deformation. The rotary forging process is lubricated with oil, and the flow speed of the lubricant is 1.5m 3 / h, the obtained nano-magnesium alloy was annealed at 120°C for 12h after swaging.

[0019] The concentration of Gd and Y elements at the grain boundary of the obtained nano-magnesium alloy is twice that in the crystal, and the grain growth temperature of the obtained nano-magnesium alloy is 0.64T m .

Embodiment 3

[0021] The atomic percentage composition of the magnesium alloy used is Mg-1.09Gd-0.69Y-0.14Zr, and the alloy bar is subjected to swaging deformation at 150°C, and the deformation of each pass is controlled to be 15%, 15%, 10%, and 10%, respectively. The amount of deformation is 41%, the feeding speed is controlled at 4mm / min, the feeding direction is changed after each pass of deformation, the swaging process is lubricated with oil, and the lubricant flow speed is 1.5m 3 / h, the obtained nano-magnesium alloy was annealed at 120°C for 12h after swaging.

[0022] The concentration of Gd and Y elements at the grain boundary of the obtained nano-magnesium alloy is twice that in the crystal, and the grain growth temperature of the obtained nano-magnesium alloy is 0.65T m .

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Abstract

The invention relates to a preparation method for low rare earth nanometer magnesium alloy with high thermal stability. The atomic percent composition of the magnesium alloy comprises Mg, 0.91-1.36 Gd, 0.87-1.29 Y and 0.06-0.14 Zr; the nanometer magnesium alloy is prepared through rotary swaging and deformation of alloy bars, and the rotary swaging temperature is controlled to be 50-200 DEG C, andthe pass deformation is controlled to be 5%-20%; the total deformation is 20%-50%, and the feed rate is controlled to be 2-6 mm/min; the feed direction is changed after each pass deformation, and lubricating oil is applied in the rotary swaging process; the flow velocity of lubricants is 1-1.5 m<3>/h, and the obtained nanometer magnesium alloy after rotary swaging is annealed at 110-150 DEG C for12-20h, so that the segregation of Gd and Y occurs at the nano-crystalline boundary, and the Gd and Y element concentration at the nanometer magnesium alloy crystalline boundary is 1.5-2 times the Gdand Y element concentration in crystalline; and the grain growth temperature of the nanometer magnesium alloy is higher than 0.64 Tm.

Description

technical field [0001] The invention relates to the field of preparation of bulk nanometer materials, in particular to a preparation method of a 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 high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明高永浩蒋树农余世伦陈志永
Owner CENT SOUTH UNIV
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