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Stress spheroidizing method of Mg-Al system magnesium alloy

A spheroidizing treatment and magnesium alloy technology, applied in the field of material science, can solve the problems of reduced tensile strength and elongation, limited strengthening effect, high energy consumption, etc., to achieve improved performance, shortened processing time, yield strength and tensile strength The effect of strength improvement

Inactive Publication Date: 2013-09-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional heat treatment method of magnesium alloy takes a long time, consumes a lot of energy, and has limited strengthening effect. Although it can improve the yield strength and hardness of magnesium alloy, it will reduce its tensile strength and elongation.

Method used

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  • Stress spheroidizing method of Mg-Al system magnesium alloy
  • Stress spheroidizing method of Mg-Al system magnesium alloy
  • Stress spheroidizing method of Mg-Al system magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The AZ80 magnesium alloy ingot with a specification of Φ40cm×15cm was cut into tensile samples with a size of 64×12×2mm by wire cutting, and placed in a vacuum resistance furnace, heated to 380°C, kept for 24 hours, and then stopped. furnace, cooled to room temperature with the furnace, and then heated to 260°C while applying 30MPa tensile stress to the above-mentioned magnesium alloy in the RDL50 electronic creep testing machine, and then air-cooled to room temperature after holding for 0.5h. The hardness was measured on a Vickers hardness tester, the model is: FM-ARS9000 automatic microhardness measurement system, the load is 50gf, and the holding time is 30s. The mechanical properties are measured on the tensile testing machine, the tensile machine model is: INSPEKTTABLE100 electronic universal testing machine, and the performance indicators include tensile strength, yield strength and elongation. Its hardness and mechanical properties are listed in Table 1.

Embodiment 2

[0018] The AZ80 magnesium alloy ingot with a specification of Φ40cm×15cm was cut into tensile samples with a size of 64×12×2mm by wire cutting, and it was placed in a vacuum resistance furnace and heated to 400°C for 10 hours, then the furnace was stopped. Cool to room temperature with the furnace, and then heat to 300°C while applying a tensile stress of 15MPa to the above-mentioned magnesium alloy in the RDL50 electronic creep testing machine, keep it warm for 1h, and then air-cool to room temperature. The hardness was measured on a Vickers hardness tester, the model is: FM-ARS9000 automatic microhardness measurement system, the load is 50gf, and the holding time is 30s. The mechanical properties were measured on a tensile testing machine. The model of the tensile machine is: INSPEKT TABLE100 electronic universal testing machine. The performance indicators include tensile strength, yield strength, and elongation. The hardness and mechanical properties are shown in Table 1.

...

Embodiment 3

[0024] The AZ80 magnesium alloy ingot with a specification of Φ40cm×15cm was cut into tensile samples with a size of 64×12×2mm by wire cutting, and it was placed in a vacuum resistance furnace and heated to 410°C for 16 hours, then the furnace was stopped. Cool to room temperature with the furnace, and then apply a tensile stress of 5 MPa to the above-mentioned magnesium alloy in an RDL50 electronic creep testing machine while heating to 320°C, keep warm for 2 hours, and then air-cool to room temperature. The hardness was measured on a Vickers hardness tester, the model is: FM-ARS9000 automatic microhardness measurement system, the load is 50gf, and the holding time is 30s. The mechanical properties were measured on a tensile testing machine. The model of the tensile machine was: INSPEKT TABLE100 electronic universal testing machine. The performance indicators included tensile strength, yield strength, and elongation. Its hardness and mechanical properties are listed in Table ...

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Abstract

A stress spheroidizing method of an Mg-Al system magnesium alloy mainly comprises the following steps: putting an AZ80 magnesium alloy in a vacuum resistance furnace, carrying out solid solution treatment, heating to 380-420DEG C, carrying out heat insulation for 8-24h, stopping heating, cooling to room temperature with the furnace, putting the obtained magnesium alloy in an RDL50 electronic creep testing machine, heating to 220-320DEG C under a 1-40MPa tension, carrying out heat insulation for 0.5-12h, and carrying out air cooling. The treatment time of the method is substantially shortened to 1h from a traditional aging treatment time of 20h; and the yield strength and tensile strength of the magnesium alloy obtained through using the method in the invention are 33% and 8.9% higher than that of the magnesium alloy obtained through the traditional aging treatment respectively.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a heat treatment method for magnesium alloys. Background technique [0002] Among magnesium alloys, Mg-Al alloys are currently the most widely used, including both cast magnesium alloys and wrought magnesium alloys. Compared with cast magnesium alloys, wrought magnesium alloys have excellent comprehensive properties, higher strength and ductility, and are more suitable for making large structural parts and meeting the requirements of structural diversification. The application of magnesium alloys in large structural parts is the future application trends. In the Mg-Al alloy, the aluminum content is 0-8%, and the zinc content is 0-1.5%. Generally, a small amount of Zn and Mn are added. The difference between the atomic radius of Al and Mg is small, and Al and Mg form a substitutional solid solution. Among them, the AZ80 magnesium alloy with an aluminum content of 8% is a typical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 张静武郑艺张学术杨猛郭伟李慧缑慧阳
Owner YANSHAN UNIV
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