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Thermo-mechanical treatment strengthening technology of magnesium alloy sheet

A deformation heat treatment, magnesium alloy technology, applied in the field of non-ferrous metals, can solve problems such as limited work

Inactive Publication Date: 2015-03-25
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For magnesium alloys, however, work in this area is very limited

Method used

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  • Thermo-mechanical treatment strengthening technology of magnesium alloy sheet
  • Thermo-mechanical treatment strengthening technology of magnesium alloy sheet
  • Thermo-mechanical treatment strengthening technology of magnesium alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The magnesium alloy in this embodiment is composed of the following components by mass percentage: 7.8% Al, 0.7% Zn, impurity element Mn<0.12%, 0% Gd, and the rest is Mg.

[0044] Select a representative part from the smelted magnesium alloy ingot to cut a magnesium alloy sheet with a size of 40×40×4mm, and grind the upper and lower surfaces with sandpaper from coarse to fine to make it smooth for use.

[0045] The treated magnesium alloy sheet is subjected to solid solution treatment in a box-type resistance furnace: the heating temperature is 415° C., and the temperature is kept for 20 hours.

[0046] The sample after solution treatment was rolled at 150°C with a deformation of 15%, followed by aging treatment. The process parameters: heating temperature was 168°C, holding time was 8h, and air cooled to room temperature.

[0047] The microstructure of the high-strength and toughness magnesium alloy obtained in this embodiment is as follows: figure 1 shown, from fi...

Embodiment 2

[0049] The magnesium alloy in this embodiment is composed of the following components by mass percentage: 7.4% Al, 0.78% Zn, impurity element Mn<0.12%, 3.01% Gd, and the rest is Mg.

[0050] Select a representative part from the smelted magnesium alloy ingot to cut a magnesium alloy sheet with a size of 40×40×4mm, and grind the upper and lower surfaces with sandpaper from coarse to fine to make it smooth for use.

[0051] The treated magnesium alloy sheet is subjected to solid solution treatment in a box-type resistance furnace: the heating temperature is 415° C., and the temperature is kept for 20 hours.

[0052] The sample after solution treatment was rolled at 160°C with a deformation of 15%, followed by aging treatment, process parameters: heating temperature was 168°C, holding time was 16h, air cooled to room temperature.

[0053] The high-strength and toughness magnesium alloy obtained in this embodiment has a tensile strength of 285 MPa and a hardness of 67HB.

Embodiment 3

[0055] The magnesium alloy in this embodiment is composed of the following components by mass percentage: 7.0% Al, 0.7% Zn, impurity element Mn<0.12%, 4.0% Gd, and the rest is Mg.

[0056] Select a representative part from the smelted magnesium alloy ingot to cut a magnesium alloy sheet with a size of 40×40×4mm, and grind the upper and lower surfaces with sandpaper from coarse to fine to make it smooth for use.

[0057] The treated magnesium alloy sheet is subjected to solid solution treatment in a box-type resistance furnace: the heating temperature is 415° C., and the temperature is kept for 20 hours.

[0058] The sample after solution treatment was rolled at 150°C with a deformation of 15%, followed by aging treatment, process parameters: heating temperature was 168°C and holding time was 12h, air cooled to room temperature.

[0059] The microstructure of the high-strength and toughness magnesium alloy obtained in this embodiment is as follows: figure 2 shown, from figu...

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Abstract

The invention discloses a thermo-mechanical treatment strengthening technology of a magnesium alloy sheet. The magnesium alloy sheet adopts an AZ81-series magnesium alloy sheet, and the thermo-mechanical treatment strengthening technology of the magnesium alloy sheet comprises steps as follows: the well-polished magnesium alloy sheet with the size of (40*40*40) mm is subjected to solution treatment, the heating temperature is 415 DEG C, and the heat preservation is performed for 20 hours; the magnesium alloy sheet is heated again to a range of 150-160 DEG C for rolling, and the deformation amount is 15%; and then the aging treatment is performed, the technological parameters include that the heating temperature is 168 DEG C and the heat preservation time is 8-16 hours, and the air cooling is performed to the room temperature. After the technological treatment, compared with the conventional heat treatment technology, mechanical properties of the alloy are improved, that is, the tensile strength sigma b of the alloy at the room temperature is improved by 15.5%-18.2%, and the hardness is improved by 12.4%-16.85%.

Description

technical field [0001] The invention belongs to the field of nonferrous metals, and in particular relates to a deformation heat treatment strengthening process of a magnesium alloy plate. Background technique [0002] Magnesium alloy has high specific strength, specific stiffness, good shock absorption, thermal conductivity and recyclability, so it is known as the "green" engineering material in the 21st century. [0003] Magnesium alloys have limited their large-scale industrial applications due to their low strength at room temperature and high temperature, and poor deformability. [0004] Among the grades of magnesium alloys, the Mg-Al series is the most widely used type of alloy. Among Mg-Al alloys, AZ81 magnesium alloy is the most widely used due to its moderate performance and low price. However, AZ81 magnesium alloy itself has many inherent disadvantages that limit its use. First of all, the solidification temperature range of this magnesium alloy is wide, and the ...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22C23/02
CPCC22F1/06C22C23/02
Inventor 郭全英孙晶毛萍莉刘正
Owner SHENYANG POLYTECHNIC UNIV
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