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A kind of high-strength and high-plasticity magnesium alloy composite plate and its preparation method

A technology for composite plates and magnesium alloys, applied in the field of materials, can solve the problems of weakening the texture of magnesium alloys and reducing the strength, and achieve the effects of improving the degree of grain refinement, improving plasticity and strength, and improving performance.

Active Publication Date: 2020-03-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] How to overcome the technical difficulties of weakening the texture of the magnesium alloy structure and reducing the strength caused by the friction stir process is the technical problem to be solved by the present invention

Method used

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  • A kind of high-strength and high-plasticity magnesium alloy composite plate and its preparation method
  • A kind of high-strength and high-plasticity magnesium alloy composite plate and its preparation method
  • A kind of high-strength and high-plasticity magnesium alloy composite plate and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Step 1: Fix the 6mm thick magnesium alloy plate on the friction stir machine tool.

[0058] Step 2: Spray water on the magnesium alloy, so that the overall friction stir processing is placed under water cooling conditions.

[0059] Step 3: The stirring head slowly presses down on the magnesium plate at a speed of 1000r / min until the shaft shoulder contacts the magnesium plate and still presses down 1mm. After staying for 3-5s, the stirring head moves forward at a feed speed of 90mm / min , until the magnesium alloy sheet is finished.

[0060] Step 4: Complete the first friction stir processing, return the stirring head to the initial position of the first processing, and process the subsequent passes at a position offset by 25mm on the backward side in the vertical direction of the processing direction in the second pass.

[0061] Step 5: Complete subsequent passes according to step 4.

[0062] Step 6: Shot peening treatment on the front and back of the magnesium alloy,...

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Abstract

The invention provides a high-intensity and high-plasticity magnesium alloy composite plate and a preparation method thereof. The magnesium alloy plate is prepared from Mg, Al, Zn, Mn, Si, Cu and Fe,and is excellent in mechanical properties such as intensity, plasticity and the like; the room temperature ductility of the plate is not less than 21 percent; the surface vickers microhardness is notless than 126 Hv; and the tensile strength is not less than 270.9 MPa. According to the method provided by the invention, a product with good mechanical properties is finally achieved by steps of stirring and friction processing treatment, surface peening and the like. The raw materials of the composite plate adopt magnesium alloy industry-level rolled plates; the production process is relativelysimple, and the overall performance of the plate is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high-strength and high-plasticity magnesium alloy composite plate and a preparation method thereof. Background technique [0002] Magnesium alloys are widely used in machinery, automobiles and electronics industries due to their low density, good specific stiffness and specific strength properties, and good electromagnetic shielding properties. However, due to the hexagonal close-packed structure and small slip system of magnesium alloys, the plastic deformation ability of magnesium alloys is poor, which limits the processing and forming of magnesium alloys to a certain extent. According to the Hall-Petch (grain refinement) formula, the strength and plasticity of the magnesium alloy are improved after grain refinement, and the strength and toughness are realized. Therefore, the practical technology of magnesium alloy grain refinement has become a hot spot in curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22F1/06
CPCC22C23/02C22F1/06
Inventor 张真李耀祖彭金华郭朋黄继安吴玉程
Owner HEFEI UNIV OF TECH
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