Method for strengthening VW93M magnesium alloy through atomic segregation and atomic clustering

An atomic cluster, magnesium alloy technology, applied in the field of magnesium alloy strengthening, can solve problems such as low strength, increased strength of magnesium alloys, and difficulty in meeting demand

Inactive Publication Date: 2018-10-30
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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The mass percentage composition of the magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, and the alloy bar is subjected to swaging deformation at 125°C, with a total deformation of 26%. The swaging process is lubricated with oil, Lubricant flow velocity is 1m 3 / h, control the feeding speed to 4mm / min, and change the feeding direction after each pass of deformation.

[0012] 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 5-7nm. The yield strength of the obtained alloy is 551MPa, the tensile strength is 613MPa, and the elongation after fracture is 5%.

Embodiment 2

[0014] The mass percentage composition of the magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er. The alloy bar is subjected to swaging deformation at 150°C, with a total deformation of 35%. The swaging process is lubricated with oil. Lubricant flow velocity is 1m 3 / h, control the feeding speed to 5mm / min, and change the feeding direction after each pass of deformation.

[0015] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is 2.1 times that in the grain, and the atomic cluster size is 5-10nm. The yield strength of the obtained alloy is 542MPa, the tensile strength is 651MPa, and the elongation after fracture is 5%.

Embodiment 3

[0017] The mass percentage composition of the magnesium alloy used is Mg-8.0Gd-3.0Y-0.4Zr-0.05Ag-0.03Er, and the alloy bar is subjected to swaging deformation at 100°C, with a total deformation of 40%. The swaging process is lubricated with oil. Lubricant flow velocity is 1.5m 3 / h, control the feeding speed to 6mm / min, and change the feeding direction after each pass of deformation.

[0018] After swaging deformation, the concentration of Gd and Y elements in the grain boundary of the alloy is 2.5 times that in the grain, and the atomic cluster size is 6-10nm. The yield strength of the obtained alloy is 530MPa, 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 a VW93M magnesium alloy through atomic segregation and atomic clusters. The magnesium alloy comprises, by mass, Mg, 8.0-9.6% of Gd, 1.8-3.2% of Y, 0.3-0.7% of Zr, 0.02-0.5% of Ag, 0.02-0.3% of Er. The method comprises the steps of conducting rotary forging deformation on a VW93M magnesium alloy bar, controlling the initial rotary forging temperature to be 100-300 DEG C and the total deformation to be 10-80%, conducting oil lubrication in the rotary forging process, controlling the flow velocity of a lubricating agent to be 0.5-1.5 m3/h and the feeding speed to be 3-6 mm/min, changing the feeding direction after each pass of deformation, wherein the concentration of Gd and Y elements of the grain boundary is 2-2.5 times greater than that of intragranular Gd and Y elements, the size of atomic clusters is 5-15 nm, and the obtained magnesium alloy has the yield strength greater than or equal to 530 MPa, the tensile strength greater than or equal to 610 MPa and the percentage elongation after fraction greater than or equal to 5%.

Description

technical field [0001] The invention relates to the field of high-performance magnesium alloy processing, 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...

Claims

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Application Information

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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永志
Owner CENT SOUTH UNIV
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