Surface strengthening method for magnesium alloy

A surface strengthening and magnesium alloy technology, which is applied in the field of magnesium alloy surface strengthening, can solve the problems of not improving strength, affecting fine grain strengthening, and difficulty in deformation, and achieves the effects of reducing equipment investment, excellent performance, and reducing energy consumption

Inactive Publication Date: 2015-01-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its existing mechanical properties are greatly affected by the deformation method and deformation temperature. In order to obtain good plasticity and facilitate forming, AZ31B needs to be heat-treated, but too high a temperature will greatly affect the fine-grain strengthening and cannot have sufficient processing. Hardening makes it unable to improve its strength. At the same time, magnesium is still a densely packed hexagonal crystal structure. Plastic deformation at low temperatures mostly depends on twins, and deformation is extremely difficult and plasticity is poor; The method needs to be solved urgently

Method used

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  • Surface strengthening method for magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The surface strengthening method of the magnesium alloy of the present embodiment specifically comprises the following steps:

[0019] (1) The 1mm AZ31B magnesium alloy plate is subjected to conventional annealing treatment at 350°C for 2 hours to make it recrystallize;

[0020] (2) At room temperature, the frequency of the surface nanometerization testing machine in a vacuum environment is 50 Hz, and 100 steel balls are respectively impacted and deformed on the two surfaces for 5 minutes to prepare a surface with extremely high hardness, improved strength and good tensile properties. Extensible AZ31B magnesium alloy material, the surface hardness can reach 0.95GPa, the yield strength can reach 210Mpa, and the elongation can reach 14%.

Embodiment 2

[0022] The surface strengthening method of the magnesium alloy of the present embodiment specifically comprises the following steps:

[0023] (1) The 3mm AZ31B magnesium alloy plate is subjected to conventional annealing treatment at 200°C for 3 hours to make it recrystallize;

[0024] (2) At room temperature, the frequency of the surface nanometerization testing machine in a vacuum environment is 20Hz, and 200 steel balls are subjected to impact deformation treatment on the two surfaces for 30 minutes respectively, and the surface hardness is extremely high, the strength is improved, and it also has good tensile properties. Extensible AZ31B magnesium alloy material, the surface hardness can reach 1.25GPa, the yield strength can reach 235Mpa, and the elongation can reach 12%.

Embodiment 3

[0026] The surface strengthening method of the magnesium alloy of the present embodiment specifically comprises the following steps:

[0027] (1) The 1mm AZ31B magnesium alloy plate is subjected to conventional annealing treatment at 400°C for 1 hour to make it recrystallize;

[0028] (2) Under the condition of feeding liquid nitrogen, the frequency of the surface nanometerization testing machine is 40 Hz, and 150 steel balls are respectively impacted and deformed on the two surfaces for 5 minutes, and the surface hardness is extremely high, the strength is improved, and it also has Good tensile plastic AZ31B magnesium alloy material, the surface hardness can reach 1.05GPa, the yield strength can reach 191Mpa, and the elongation can reach 12.6%.

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Abstract

The invention discloses a surface strengthening method for a magnesium alloy and belongs to the technical field of processing of metal materials. The method comprises the following steps: annealing a magnesium alloy plate at 200-400 DEG C for 1-3 hours; and carrying out impact deformation treatment on the annealed magnesium alloy plate for 5-30 minutes by using a surface nanocrystallization tester in a vacuum environment or a liquid nitrogen environment under the condition that the frequency is 20-50Hz and 100-200 steel balls are used so as to prepare the magnesium alloy material of which the surface hardness is extremely high, the strength is enhanced and the tensile ductility is excellent. The method disclosed by the invention is simple in preparation process, so that the plate with the strength which is over 2 times that of a plate subjected to annealing firstly and then recrystallization can be obtained. The magnesium alloy material which is excellent in mechanical property has a huge application space in booming industries such as automobiles, rail transit, aerospace, electrocommunication and weaponry.

Description

technical field [0001] The invention relates to a surface strengthening method of a magnesium alloy, which belongs to the technical field of metal material processing. Background technique [0002] Magnesium alloy is one of the lightest structural materials, and has the advantages of high specific strength and specific stiffness, good shock absorption, good thermal fatigue, good damping and machinability, easy recycling, etc., and has good die-casting process performance The above excellent properties make magnesium alloys widely used in automobiles, rail transit, aerospace, electronic communications, weaponry and other industries at home and abroad to reduce weight, save energy, reduce pollution and improve the environment. In magnesium alloy materials, most of the products are casted, but the mechanical properties of cast castings are often limited due to defects, and the application is greatly restricted. AZ31B emerged as a wrought magnesium alloy capable of plastic form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 朱心昆王伟杨新诚
Owner KUNMING UNIV OF SCI & TECH
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