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Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation

A technology of twinning deformation and ultra-fine grains, which is applied in the field of preparing bulk nano/ultrafine-grain magnesium alloys by twinning deformation, can solve the problems of poor strain accumulation effect, uncontrolled recrystallization, and difficulty in scale, and achieves convenient operation. , suppress the dynamic reply, avoid the effect of reply

Inactive Publication Date: 2010-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation of nanometer and submicron magnesium alloys must solve the problems of uncontrolled recrystallization, poor strain accumulation effect and difficult scale in severe plastic deformation

Method used

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  • Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation
  • Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation
  • Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cut the AZ31 magnesium alloy extruded bar into a rectangular block sample and place it on the lower flat anvil of the hydraulic press, first take the X axis as the compression axis, and -4 the s -1 compression deformation at a strain rate of . When the true strain in the X direction reaches 0.2, the compression is stopped, and the sample is rotated 90 degrees, with the Y axis as the compression axis, and compressed again. When the true strain in the Y direction reaches 0.2, the compression is stopped, and the sample is rotated 90 degrees, with the Z axis as the compression axis, and compressed again. When the true strain in the Z direction reaches 0.2, the compression is stopped, the sample is rotated 90 degrees, and then the X axis is used as the compression axis, and the compression in the X→Y→Z→X direction is repeated. When the true strain in each direction is accumulated to 2, the twin-strengthened bulk nano-magnesium alloy with an average size of less than 0.5 μm...

Embodiment 2

[0039] Cut the AZ31 magnesium alloy extruded bar into a rectangular block sample and place it on the lower flat anvil of the hydraulic press, first take the X axis as the compression axis, and -2 the s -1 compression deformation at a strain rate of . When the true strain in the X direction reaches 0.1, the compression is stopped, and the sample is rotated 90 degrees, with the Y axis as the compression axis, and compressed again. When the true strain in the Y direction reaches 0.1, the compression is stopped, and the sample is rotated 90 degrees, with the Z axis as the compression axis, and compressed again. When the true strain in the Z direction reaches 0.1, the compression is stopped, the sample is rotated 90 degrees, and then the X axis is used as the compression axis, and the compression in the X→Y→Z→X direction is repeated. When the cumulative true strain in each direction reaches 1.5, the twin-strengthened bulk nano-magnesium alloy with an average size of less than 0.3...

Embodiment 3

[0041] Cut AZ31 magnesium alloy extruded rods into rectangular block samples, place them in liquid nitrogen at -196°C for 5 minutes, take them out and place them on the lower flat anvil of a hydraulic press, first take the X axis as the compression axis, 1 the s -1compression deformation at a strain rate of . When the true strain in the X direction reaches 0.05, stop the compression, put the sample back into the liquid nitrogen for 5 minutes and take it out, rotate the sample 90 degrees, take the Y axis as the compression axis, and compress again. When the true strain in the Y direction reaches 0.05, the compression is stopped, and the sample is placed in liquid nitrogen for 5 minutes and then taken out, and the sample is rotated 90 degrees, with the Z axis as the compression axis, and compressed again. When the true strain in the Z direction reaches 0.05, stop the compression, put the sample in liquid nitrogen for 5 minutes and take it out, rotate the sample 90 degrees, take...

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Abstract

A method for preparing block nano-magnesium alloy by utilizing twinning deformation comprises: magnesium alloy cast ingots or extruded bars are cut into rectangular blocks; compression twin crystal deformation with multiple channels and axes is respectively carried out along three direction of X axis, Y axis and Z axis of the rectangular block at the room temperature; the true strain capacity andthe strain rate at every channel are controlled; when the true strain capacities along all the directions are accumulated to reach at least 1.5h, the twin crystal reinforced block nano-magnesium alloyhaving the average size being less than 0.5mum can be obtained. The method has simple processing technique and equipment requirements as well as convenient operation, and can overcome the problems ofincontrollable recrystallization, poor effect of strain accumulation and difficult scale in severe plastic deformation of the prior art when in thinning magnesium alloy crystal grains; the method canbe used for preparing large dense superfine grained magnesium alloy material and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of ultrafine-grained magnesium alloys and magnesium alloy processing, and relates to a method for obtaining huge cold deformation and high-density twin structure of magnesium alloys at room temperature, in particular to a method for preparing bulk nano / ultra A method for fine-grained magnesium alloys. Background technique [0002] As the metal structure material with the lowest density, ultrafine-grained magnesium alloy has the advantages of high specific strength, high specific modulus, and electromagnetic shielding. It has important application value and broad application prospects in the fields of automobile, electronics, aerospace, and national defense. At present, the main method for preparing bulk ultrafine-grained magnesium alloys is equal channel angular extrusion (ECAP), but the size of the products prepared by this method is small, and it also requires large-tonnage hydraulic presses and expensive molds. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
Inventor 杨续跃
Owner CENT SOUTH UNIV
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