Method for strengthening low rare earth magnesium alloy through atomic segregation and atomic cluster

A technology of atomic clusters and rare earth magnesium, applied in the field of ultra-high-strength magnesium alloy preparation, can solve the problems of difficult to meet the demand, increase the strength of magnesium alloy, and low strength

Inactive Publication Date: 2018-11-02
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 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, with a total deformation of 26%. The swaging process is lubricated with oil, and the flow rate of the lubricant is 0.8 m3 / h, the feed rate is controlled to be 3mm / min.

[0013] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is 1.5 times that in the grain, and the atomic cluster size is 4-7nm. The yield strength of the obtained alloy is 520MPa, the tensile strength is 605MPa, and the elongation after fracture is 6%.

Embodiment 2

[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 150°C, with a total deformation of 35%. The swaging process is lubricated with oil, and the flow rate of the lubricant is 0.8 m3 / h, the feed rate is controlled to be 3mm / min.

[0016] The concentration of Gd and Y elements in the grain boundary of the alloy after swaging deformation is 1.8 times that in the grain, and the atomic cluster size is 5-10nm. The yield strength of the obtained alloy is 513MPa, the tensile strength is 615MPa, and the elongation after fracture is 6%.

Embodiment 3

[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 200°C, with a total deformation of 40%. The swaging process is lubricated with oil, and the flow rate of the lubricant is 1m 3 / h, the control feed rate is 2mm / min.

[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 6-10nm. The yield strength of the obtained alloy is 515MPa, the tensile strength is 620MPa, and the elongation after fracture is 7%.

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Abstract

The invention relates to a method for strengthening low rare earth magnesium alloy through atomic segregation and atomic cluster, the component of the magnesium alloy atom are as follows by percentage: 0.91-1.36 percent of Gd, 0.87-1.29 percent of Y 0.06-0.14 percent of Zr, the alloy bar is subjected to rotary forging deformation, the initial rotary forging temperature is controlled to be 100- 200DEG C, the total deformation is 10-60%, oil lubrication is used in the rotary forging process, the flow rate of lubricant is 0.5-1m<3>/h, the feeding rate is controlled to be 1-4 mm/min, after deformation, feeding direction is changed. Gd and Y elements segregate at grain boundaries and form nano-scale atomic clusters through dislocation and deformation heat generated in rotary forging deformation, the concentration of Gd and Y elements at grain boundaries is 1.5-2 times that within grain boundaries, the size of atomic clusters is 5-10 nm. Under the synergistic strengthening of atomic segregation and nano-clusters, the yield strength of the magnesium alloy is larger than or equal to 510 MPa, the tensile strength is larger than or equal to 600MPa, and the percentage elongation after fracture is larger than or equal to 6%.

Description

technical field [0001] The invention relates to the field of high-performance magnesium alloy processing, in particular to a method for preparing an ultra-high-strength 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. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06B21J5/02
CPCB21J5/02C22C23/06
Inventor 万迎春刘楚明郭学益高永浩蒋树农余世伦陈志永
Owner CENT SOUTH UNIV
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