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Thermal treatment process for improving deformed magnesium alloy strength

A technology for deforming magnesium alloys and magnesium alloys, which is applied in the field of heat treatment of magnesium alloy materials, can solve the problems of improved mechanical properties and weak strengthening effect of deformed magnesium alloys, and achieves the effects of improving production efficiency, wide application and simple operation.

Active Publication Date: 2013-08-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The study found that artificial aging of wrought magnesium alloys for different times, although the second phase precipitated during the aging process, the strengthening effect was weak. Within a certain range, the amount of the second phase increased with the increase of the aging time, but this did not The mechanical properties of wrought magnesium alloys have not been significantly improved

Method used

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  • Thermal treatment process for improving deformed magnesium alloy strength
  • Thermal treatment process for improving deformed magnesium alloy strength
  • Thermal treatment process for improving deformed magnesium alloy strength

Examples

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Effect test

Embodiment 1

[0028] A heat treatment process for improving the strength of a deformed magnesium alloy, the heat treatment process comprising the following steps:

[0029] 1) Magnesium alloy raw material: ordinary AZ61 deformed magnesium alloy ingot is used as raw material, the alloy composition (weight percentage) is: 6.64% Al, 1.01% Zn, 0.25% Mn, impurity elements are less than 0.01%, and the rest is Mg.

[0030] 2) Homogenization treatment of magnesium alloy ingots: perform homogenization treatment of magnesium alloy ingots in a heat treatment furnace at a temperature of 400°C for 12 hours.

[0031] 3) Extrusion plastic deformation: Extrude the homogenized magnesium alloy ingot on an extruder at an extrusion temperature of 390°C and an extrusion ratio of 11.7.

[0032] image 3 (a) is the scanning structure photo of the AZ61 magnesium alloy extruded sheet. It can be seen from the figure that in the AZ61 magnesium alloy extruded sheet, there is very little second phase, which has...

Embodiment 2

[0037] The magnesium alloy raw material and homogenization treatment, extrusion plastic deformation, cold rolling plastic deformation, and artificial aging heat treatment temperature are the same as those in Example 1, except that the AZ61 magnesium alloy aging holding time is 60 hours.

[0038] image 3 (c) is the scanning structure photo of AZ61 magnesium alloy after extrusion, 7.5% cold rolling, aging at 200°C for 60h, and air cooling. It can be seen from this that the relative image 3 (b) The number of second phase precipitation is more, and the second phase precipitation is more obvious at grain boundaries and twins, and the volume is larger. The AZ61 magnesium alloy obtained by this process has a yield strength of 231MPa, a tensile strength of 345MPa and an elongation of 12.7% at room temperature.

Embodiment 3

[0040] The magnesium alloy raw material and homogenization treatment, extrusion plastic deformation, cold rolling plastic deformation, and artificial aging heat treatment temperature are the same as those in Example 1, except that the AZ61 magnesium alloy aging holding time is 100 hours.

[0041] image 3 (d) is the scanning structure photo of AZ61 magnesium alloy after extrusion, 7.5% cold rolling, aging at 200°C for 100h, and air cooling. It can be seen from the figure that the second phase is obviously coarsened at the grain boundaries and twins. The AZ61 magnesium alloy obtained by this process has a yield strength of 219MPa, a tensile strength of 343MPa and an elongation of 11.6% at room temperature.

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Abstract

The invention provides a thermal treatment process for improving deformed magnesium alloy strength, which is used for achieving the purpose of remarkably improving the magnesium alloy strength through small-deformation cold rolling and different-time artificial ageing. The thermal treatment process specifically comprises the following steps of: (1), carrying out cold rolling on magnesium alloy under the room temperature, wherein the cold-rolling deformation is 5%-7.5%; and (2), heating up the cold-rolled and pre-deformed magnesium alloy to 150 DEG C to 200 DEG C for ageing, preserving the heat for 15 hours to 100 hours, and cooling in the air to the room temperature. The thermal treatment process can be used for remarkably improving the strength of the magnesium alloy. Moreover, relative to the normal ageing process, the thermal treatment process further can be used for remarkably improving the aging velocity of the magnesium alloy. Besides, the used process equipment is normal common equipment which is easy to operate, lower in cost and easy to industrialize.

Description

technical field [0001] The invention relates to a heat treatment process for magnesium alloy materials, in particular to a heat treatment process for improving the strength of deformed magnesium alloys. [0002] Background technique [0003] In recent years, with the rapid and efficient development of various industries, higher and higher requirements have been put forward for the performance of structural materials and various parts used in production. It is urgent to develop various new materials, such as magnesium and magnesium Alloys to meet the performance requirements of various materials in different environments. Magnesium and magnesium alloys are currently the lightest metal structural materials, with low density, high specific strength and specific stiffness, good damping and shock absorption, good thermal conductivity, good electromagnetic shielding effect, excellent machining performance, stable parts size, and easy recycling And other advantages, it has broad ...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 潘复生张志华陈先华刘莉滋
Owner CHONGQING UNIV
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