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Atomic segregation and clustering strengthening method for Mg-Gd-Y-Zr alloy

A technology of atomic clusters and magnesium alloys, applied in the field of magnesium alloy strengthening, can solve problems such as low strength, increased strength of magnesium alloys, and difficulties in meeting demands

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, the existing magnesium alloys generally have low strength, which makes it difficult to meet the demand for high-performance magnesium alloys in the high-precision field.
The existing magnesium alloy strengthening methods include solid solution strengthening, fine grain strengthening, second phase strengthening and dispersion strengthening, but the existing magnesium alloy strengthening methods are difficult to increase the strength of magnesium alloys to 600MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The mass percentage composition of the magnesium alloy used is Mg-8Gd-3Y-0.4Zr, and the Mg-Gd-Y-Zr alloy bar is subjected to swaging deformation at room temperature. The amount of deformation is 14%, oil lubrication is used in the rotary forging process, and the flow speed of lubricant is 1.5m 3 / h, control the feeding speed to 10mm / min, and change the feeding direction after each pass of deformation.

[0013] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is 1.8 times that in the grain, and the atomic cluster size is 3-7nm. The yield strength of the obtained alloy is 540MPa, the tensile strength is 610MPa, and the elongation after fracture is 6%.

Embodiment 2

[0015] The mass percentage composition of the magnesium alloy used is Mg-8Gd-3Y-0.4Zr, and the Mg-Gd-Y-Zr alloy bar is subjected to swaging deformation at room temperature, and the deformation amount of the control pass is 3%, 5%, 5%, 3% %, the total deformation is 16%, oil lubrication is used in the swaging process, and the lubricant flow speed is 1m 3 / h, control the feeding speed to 10mm / min, and change the feeding direction after each pass of deformation.

[0016] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is twice that in the grain, and the atomic cluster size is 3-10nm. The yield strength of the obtained alloy is 530MPa, the tensile strength is 647MPa, and the elongation after fracture is 5%.

Embodiment 3

[0018] The mass percentage composition of the magnesium alloy used is Mg-8Gd-3Y-0.4Zr, and the Mg-Gd-Y-Zr alloy bar is subjected to swaging deformation at room temperature, and the deformation amount of the control pass is 5%, 5%, 5%, 5% %, 5%, the total deformation is 23%, oil lubrication is used in the swaging process, and the lubricant flow rate is 1.5m 3 / h, control the feeding speed to 8mm / min, and change the feeding direction after each pass of deformation.

[0019] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is twice that in the grain, and the atomic cluster size is 7~13nm. The yield strength of the obtained alloy is 525MPa, the tensile strength is 611MPa, and the elongation after fracture is 7%.

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Abstract

The invention relates to an atomic segregation and clustering strengthening method for Mg-Gd-Y-Zr alloy. The magnesium alloy comprises the components including, by mass, Mg, 7-9% of Gd, 2.5-3.5% of Yand 0.2-0.45% of Zr; and an alloy bar is subjected to rotary swaging at the temperature of 0-200 DEG C, the pass deformation is controlled to be 1-10%, the total deformation is 10-60%, the rotary swaging process adopts lubricating oil, the flowing speed of a lubricant is 0.5-1.5 m<3> / h, the feeding speed is controlled to be 1-10 mm / min, the feeding direction is changed after each pass deformation,the grain boundary concentrations of the elements of Gd and Y after rotary swaging deformation are 1.2-2.5 times intracrystalline concentrations, the atomic cluster size is 3-15 nm, the obtained magnesium alloy yield strength is greater than or equal to 520 MPa, the tensile strength is greater than or equal to 600 MPa, and the percentage elongation after fracture is greater than or equal to 5%.

Description

technical field [0001] The invention relates to the field of high-performance magnesium alloys, in particular to a magnesium alloy strengthening method. 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. However, the existing magnesium alloys generally have low strength, which makes it difficult to meet the demand for high-performance magnesium alloys in the high-precision field. The existing magnesium alloy strengthening methods include solid solution strengthening, fine grain strengthening, second phase strengthening and dispersion strengthening, but it is difficult to increase the strength of magnesium alloy to 600MPa by the existing magnesium alloy strengthening methods. Therefore, exploring the stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/06
Inventor 万迎春刘楚明蒋树农高永浩陈志永
Owner CENT SOUTH UNIV
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