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Plastic working technique for increasing damping performance of high-strength wrought magnesium alloys

A technology for deforming magnesium alloys and plastic processing, applied in the field of magnesium alloys, can solve problems such as complex processes and failed material properties, and achieve the effects of simple process equipment, low cost, and simple and mature processes

Inactive Publication Date: 2008-12-31
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

Method used

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  • Plastic working technique for increasing damping performance of high-strength wrought magnesium alloys

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: A plastic processing method for improving the damping performance of a high-strength deformed magnesium alloy, the plastic processing process includes the following steps:

[0015] 1) Alloy homogenization heat treatment process: use common commercial ZK60 high-strength deformed magnesium alloy ingot as raw material, alloy composition (weight percentage): 5.6% Zn, 0.54% Zr, impurity elements less than 0.02%, the rest is Mg . Annealing heat treatment is carried out in a heat treatment furnace, the process parameters are: temperature 390 ° C, time 8 hours;

[0016] 2) Extrusion plastic deformation: Extrude the homogenized magnesium alloy ingot on an extruder, the process parameters are: extrusion temperature 380°C, extrusion ratio 11, extrusion speed 5m / min, and constant speed;

[0017] The ZK60 deformed magnesium alloy after extrusion plastic deformation has a tensile strength of 334.9MPa, a yield strength of 246.6MPa, and an elongation of 12.7% at room te...

Embodiment 2

[0020] Embodiment 2: The difference from Example 1 is that the common commercial high-strength deformed magnesium alloy raw material used is different. The magnesium alloy raw material adopts AZ61, and the alloy composition (weight percentage) is: 5.81% Al, 0.55% Zn, 0.29% Mn , the impurity element is less than 0.02%, and the rest is Mg.

[0021] The homogenization heat treatment process, extrusion plastic deformation and upsetting forging process of the alloy are all the same. The extrusion parameters are: extrusion temperature 350° C., extrusion ratio 11, extrusion speed 5 m / min, and the speed is constant. The upsetting forging process is as follows: heat preservation at 400°C for 1.5 hours before upsetting, the magnesium alloy ingot temperature is 315°C during upsetting, the upsetting rate is 40%, and the upsetting strain rate is 0.001 / s.

[0022] After extrusion plastic deformation, the tensile strength of the alloy at room temperature is 320.0MPa, the yield strength is 2...

Embodiment 3

[0023] Example 3: The difference from Example 2 is that the magnesium alloy ingot is not subjected to a homogenization heat treatment process. The extrusion plastic deformation parameters are: extrusion temperature 350°C, extrusion ratio 11, extrusion speed 6m / min, and the speed is constant. The upsetting forging process is as follows: heat preservation at 400°C for 2 hours, and then upsetting. The temperature of the magnesium alloy ingot is 315°C during upsetting, the upsetting rate is 40%, and the upsetting strain rate is 0.001 / s.

[0024] After the alloy is directly extruded and plastically deformed, the tensile strength at room temperature is 311.9MPa, the yield strength is 187.9MPa, and the elongation is 13.8%. When the frequency is 1Hz and the strain amplitude is 0.5%, the damping performance of the alloy after extrusion ( Expressed as loss tangent) tanδ=0.06. After forging, the tensile strength of the alloy at room temperature is 282.5MPa, the yield strength is 121.5MP...

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Abstract

The invention provides a plastic working process for improving the damping property of a high-strength wrought magnesium alloy. The plastic working process includes the following steps: plastic deformation by extrusion: a magnesium alloy ingot is extruded on an extruder, the technical parameters are that the extrusion temperature is 350-400 DEG C, the extrusion ratio is 9-15, the extrusion speed is 2-8m/min and the speed is constant; upsetting type forging treatment: the wrought magnesium alloy treated by extrusion and plastic deformation is upset after keeping the temperature of 380-400 DEG C for 1-2 hours, the temperature of the magnesium alloy ingot at upsetting is 315-375 DEG C, the upset rate is 30%-40%, and the strain rate of upsetting is 0.001-0.01/s. The plastic working process of the invention can greatly improve the damping property of the high strength wrought magnesium alloy and guarantee good mechanical property simultaneously, and successfully solves the contradiction between the strength and the damping property of the magnesium alloy. The wrought magnesium alloy treated by the plastic working process has wide application fields, and can satisfy the actual requirement for high-strength, high-damping and light-weight materials in the fields of high speed train, automobile, aeronautics and astronautics, national defense, military industry, etc. In addition, the process equipment used in the plastic working process is the conventional universal equipment which is low in cost.

Description

technical field [0001] The invention relates to a plastic processing method in the technical field of magnesium alloys, in particular to a plastic processing process for improving the damping performance of high-strength deformed magnesium alloys. Background technique [0002] Magnesium and magnesium alloys have a series of advantages such as 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 and national defense military. Industry and other fields require lightweight, high-speed, high-power, energy-saving and noise reduction. Therefore, magnesium-based functional-structure integrated materials with high damping and high specific strength have become an important direction for the development of metal structural materials. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/04B21C23/01B21J5/08C21D1/26
Inventor 王敬丰潘复生丁培道高珊张丁非
Owner CHONGQING UNIV
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