Method for improving mechanical property of cast magnesium alloys

A technology of casting magnesium alloys and mechanics, which is applied in the field of improving the mechanical properties of casting magnesium alloys, and can solve problems such as performance degradation of magnesium alloys, oxidation of magnesium alloys, and energy consumption

Inactive Publication Date: 2008-12-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be pointed out that the solution treatment at high temperature for a long time not only consumes energy, causes severe oxidation on the surface of the magnesium alloy, but also significantly coarsens the matrix grains, which reduces the performance of the magnesium alloy.
Although the equal channel angular extrusion (ECAP) technology can simultaneously realize the matrix grain and β-Mg 17 Al 12 Phase refinement, but at least 4 processing passes are required to achieve microstructure refinement and homogenization (Journal of Alloys and Compounds, vol.394(2005)p.194-199), and ECAP technology can only process Smaller rods and plates with very limited applicability and industrial prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Using an 8 mm thick AZ91 as-cast plate, 2 passes of friction stir processing were performed under the processing parameters of tool speed 600 rpm and travel speed 150 mm / min, and then aging treatment was performed at 168 °C for 16 hours. The tensile properties of the sample are: tensile strength 354MPa, yield strength 210MPa, and elongation 14%. 10 7 Under the cycle, the fatigue strength is 80MPa.

Embodiment 2

[0013] Using a 10 mm thick AZ80 as-cast plate, 2 passes of friction stir processing were performed under the processing parameters of tool speed 800 rpm and travel speed 200 mm / min, followed by aging treatment at 177 °C for 10 hours. The tensile properties of the sample are: tensile strength 366MPa, yield strength 245MPa, and elongation 16%. 10 7 Under the cycle, the fatigue strength is 90MPa.

Embodiment 3

[0021] Using a 10 mm thick AZ80 as-cast plate, 2 passes of friction stir processing were performed under the processing parameters of tool speed 700 rpm and travel speed 150 mm / min, and then aging treatment was performed at 177 °C for 10 hours. The tensile properties of the sample are: tensile strength 360MPa, yield strength 235MPa, and elongation 15%. 10 7 Under the cycle, the fatigue strength is 86MPa.

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Abstract

Disclosed is a method for improving mechanical properties of a cast magnesium alloy, which is characterized in that: the stirring friction processing is conducted to the cast magnesium alloy by 2 to 5 passes, with a rotating speed of 600 to 800r/min and a marching speed of 120 to 200mm/min of a machining tool. The time effect treatment is carried out to the processed material at a temperature of between 160 and 200DEG C for 10 to 40 hours. The magnesium alloy processed by the method has excellent mechanical properties.

Description

Technical field: [0001] The invention relates to metal materials, and in particular provides a method for improving the mechanical properties of cast magnesium alloys, which is suitable for processing various precipitation-strengthened magnesium alloy castings. Background technique: [0002] High-strength magnesium alloys have low density, high specific strength, and good damping properties, so they have broad application prospects in the industrial field. Refining matrix grains and improving the morphology and distribution of precipitation strengthening phases are the main ways to improve the properties of magnesium alloys. However, the existing processing / treatment technologies are either complex in process, high in cost, or unable to achieve the dual purposes of refining grains and improving the distribution of precipitated phases at the same time. [0003] For example, for the most widely used AZ91 die-casting alloy in the industry, the as-cast structure consists of coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 马宗义冯艾寒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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