Heat treatment process improving high strength wrought magnesium alloy damping performance

A deformed magnesium alloy, high-strength technology, applied in the field of heat treatment technology, can solve the problems of material performance failure and complicated process, and achieve the effect of guaranteed mechanical properties, simple and mature process, and easy operation

Inactive Publication Date: 2009-01-21
CHONGQING UNIV
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  • Application Information

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Problems solved by technology

But it should be seen that this technology has not achieved the expected effect, and can only make the tensile strength and yield strength reach 212MPa and 135MPa, and the damping performance Q -1 Reached 0.023; and there are still problems such as the material performance has not passed the inspection of industrial production, and the process is complicated

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  • Heat treatment process improving high strength wrought magnesium alloy damping performance
  • Heat treatment process improving high strength wrought magnesium alloy damping performance
  • Heat treatment process improving high strength wrought magnesium alloy damping performance

Examples

Experimental program
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Embodiment 1

[0024] Embodiment 1: A heat treatment process method for improving the damping performance of a high-strength deformed magnesium alloy, the heat treatment process comprising the following steps:

[0025] (1) Magnesium alloy raw materials used: common commercial AZ61 high-strength deformed magnesium alloy ingots are used as raw materials, the alloy composition (weight percentage) is: 5.81% Al, 0.55% Zn, 0.29% Mn, impurity elements are less than 0.02% , and the rest are Mg.

[0026] (2) Homogenization treatment of magnesium alloy ingots: the homogenization treatment of magnesium alloy ingots is carried out in a heat treatment furnace, and the process parameters are: temperature 390° C., time 8 hours.

[0027] (3) Extrusion plastic deformation: Extrude the homogenized magnesium alloy ingot on an extruder, the process parameters are: extrusion temperature 350°C, extrusion ratio 11, extrusion speed 5m / min, And the speed is constant.

[0028] Figure 1 is a photo of the metallograp...

Embodiment 2

[0032] Embodiment 2: The same magnesium alloy raw material, magnesium alloy ingot homogenization treatment, extrusion plastic deformation, solution heat treatment process as in embodiment 1 are used, and the process parameters are completely the same. The difference is that the deformed magnesium alloy after the solution heat treatment described in Example 1 is subjected to aging heat treatment again, and the process parameters are: heating to 160° C., holding the temperature for 24 hours, and air cooling to room temperature.

[0033] The AZ61 wrought magnesium alloy obtained through the treatment of Example 2 has a tensile strength of 345.1MPa at room temperature, a yield strength of 236.0MPa, and an elongation of 12.0%; at a frequency of 1Hz and a strain amplitude of 3.5×10 -3 When, the damping performance Q of the alloy -1 = 0.092.

[0034] Since the damping of magnesium alloys is mainly caused by the dislocation mechanism, it is generally believed that the mechanical prop...

Embodiment 3

[0035] Example 3: The difference from Example 1 is that the homogenization treatment of the magnesium alloy ingot is not implemented. The magnesium alloy raw material, extrusion plastic deformation and solution heat treatment process used in this embodiment are the same as those in Embodiment 1, and the process parameters are also consistent.

[0036] The metallographic structure of the AZ61 deformed magnesium alloy after extrusion plastic deformation in this example is shown in Figure 4. Compared with Figure 1, it can be seen that the grains in Figure 4 are relatively small, which is due to the lack of homogenization treatment before extrusion . The tensile strength of the AZ61 deformed magnesium alloy after extrusion plastic deformation at room temperature is 311.9MPa, the yield strength is 187.9MPa, and the elongation is 13.8%; at a frequency of 1Hz and a strain amplitude of 3.5×10 -3 When, the damping performance Q of the alloy -1 = 0.031.

[0037] In this embodiment, the...

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Abstract

The invention provides a heat treatment process for improving the damping properties of high-strength deformed magnesium alloy. A magnesium alloy ingot which is extruded for plastic deformation is subjected to solid solution at a temperature between 350 and 400 DEG C, has heat preserved for 2 to 4 hours, and is water-quenched to a room temperature; and the deformed magnesium alloy processed via the technical proposal is heated to be between 140 and 160 DEG C for aging, has heat preserved for 20 to 30 hours, and is air-cooled to the room temperature. The heat treatment process exponentially improves the damping properties of the high-strength deformed magnesium alloy at the same time when ensuring good mechanical properties, thereby successfully solving the contradiction between the strength and damping properties of the magnesium alloy. The deformed magnesium alloy processed via the heat treatment process is wide in application range, and can meet the actual demand for high-strength high-damping lightweight materials in the high-speed train, automobile, aerospace, national defense military and other fields. Moreover, the heat treatment process is simple in equipment, low in cost and easy to operate.

Description

technical field [0001] The invention relates to a heat treatment process for deformed magnesium alloy materials, in particular to a heat treatment process method for improving the damping performance of high-strength deformed magnesium alloys. Background technique [0002] With the rapid development of modern industry, the development of automobiles, aircraft and mobile weapons has become increasingly lightweight, high-speed and high-power, and the vibration and noise problems caused by this have become particularly prominent. Magnesium and magnesium alloys have a series of advantages such as low density, high specific strength, strong damping, vibration and noise reduction capabilities, excellent thermal and electrical conductivity, and strong electromagnetic radiation shielding capabilities, which can meet the requirements of modern automobiles, rail transit, electronics, communications, aerospace, etc. The needs of light weight, high speed, high power, energy saving and n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 王敬丰潘复生彭建赵亮张丁非
Owner CHONGQING UNIV
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