A kind of preparation method of fine-grain/ultra-fine-grain metal layered material

A metal material and metal layer technology, applied in the direction of metal extrusion dies, etc., can solve problems such as total strain limit, material strength reduction, material size reduction, etc., to achieve low equipment requirements, good stress state, and refinement of grains. Effect

Inactive Publication Date: 2016-07-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the ECAP process, more passes are required to accumulate strain to prepare ultra-fine-grained materials, and for some materials, such as magnesium alloys, texture weakening will occur after multiple passes of deformation, resulting in a decrease in material strength ; under the ARB process, the stress state of the material is poor, and edge cracks are prone to occur, and the size of the material decreases with the increase of the pressure vector, so the total strain will be limited

Method used

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  • A kind of preparation method of fine-grain/ultra-fine-grain metal layered material
  • A kind of preparation method of fine-grain/ultra-fine-grain metal layered material
  • A kind of preparation method of fine-grain/ultra-fine-grain metal layered material

Examples

Experimental program
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Effect test

Embodiment 1

[0045] figure 1 Schematic diagram of the unequal channel angular extrusion die used in this example. Such as figure 1 As shown, the non-equal channel angular extrusion die is provided with intersecting first channel 1 and second channel 2, and the first channel 1 and second channel 2 form a corner, wherein the internal angle Φ is 120° (the value range can be 90°~160°), the outer angle Ψ is 45° (the value range can be 0°~45°); the width W of the first channel 1 and the second channel 2 are equal, W=50mm, the thickness L of the first channel 1 =20mm, greater than the thickness L of the second channel 2 =10mm; that is, the cross-sectional dimension of the first channel 1 is 20mm×50mm (L 1 ×W), the cross-sectional size of the first channel 2 is 10mm×50mm (L 2 ×W).

[0046] In this embodiment, the same metal layered material is prepared, and the specific steps are as follows:

[0047] (1) Select two metal material samples, and pretreat the superimposed surfaces of the metal m...

Embodiment 2

[0057] In this embodiment, heterogeneous metal layered materials are prepared, and the specific steps are as follows:

[0058] (1) Select two metal material samples, and pretreat the superimposed surfaces of the metal material samples: remove the attachments and oxides on the superimposed surfaces by mechanical grinding or chemical methods;

[0059] The two metal material samples in this embodiment are hot-rolled ME20M magnesium alloy plate and pure aluminum ingot (99.7%), the cross-sectional dimensions are 10mm×50mm, and the composition of ME20M magnesium alloy plate is the same as that in Example 1.

[0060] (2) Multi-pass composite extrusion:

[0061] The first compound extrusion:

[0062] (2-1) After superimposing the metal material samples to form a combined sample, wrap the combined sample with aluminum foil and place it in the first channel of the non-equal channel angular extrusion die. At the same time, the non-equal channel angular extrusion The mold is preheated; ...

Embodiment 3

[0073] Present embodiment except following steps, all the other steps are all the same with embodiment 2:

[0074] (2-5) After superimposing the pretreated metal material samples along the thickness direction, wrap them with aluminum foil, rotate 180°, and place them in the first channel of the non-equal channel angular extrusion die. At the same time, the non-equal channel The corner extrusion die is preheated;

[0075] (2-6) Extrusion deformation: after 400°C, keep warm for 60 minutes, apply extrusion force immediately after the holding time is up, and make the metal material sample completely pass through the first channel of the non-equal channel angular extrusion die at a speed of 1.5mm / s and the corner of the second channel, extruded through the second channel.

[0076] In this embodiment, the layered material of dissimilar metals is obtained, which has good interfacial bonding.

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Abstract

The invention discloses a preparation method of a fine-grain / ultra-fine-grain metal stratified material. The preparation method comprises the following steps of: (1) selecting n metal material samples, and preprocessing laminated faces of the metal material samples, wherein n is more than or equal to 2; and (2) laminating the metal material samples to form a combined sample, putting the combined sample into a non-equal channel angular extrusion-rolling mold, carrying out composite extrusion-rolling: applying an extrusion force to enable the combined sample to pass through a corner of the mold so that the combined sample generates shear deformation and compression deformation at the same time so as to form the fine-grain / ultra-fine-grain metal stratified material, wherein the composite extrusion-rolling is single-pass composite extrusion-rolling or multi-pass composite extrusion-rolling. By utilizing the method disclosed by the invention, the fine-grain or ultra-fine-grain metal stratified material can be prepared, and the high interface bonding strength can be achieved. The method has the characteristics of simple process, high efficiency, low device requirement and the like; and meanwhile, the material prepared by utilizing the method has good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of plastic processing of metal materials, in particular to a method for preparing metal layered materials by using a non-equal channel angular extrusion die. Background technique [0002] With the rapid development of aerospace, electronics, automobile, medical and other industries, it is necessary to develop new materials to meet the increasingly stringent environmental requirements. [0003] Metal layered materials have good mechanical properties (especially bending resistance and impact resistance) and physical properties, especially metal layered composite materials can guarantee the original properties of various metal material components, and have a single metal material. The advantages of physical, chemical and mechanical properties that it does not have are expected to meet the performance requirements of aerospace, electronics, automobiles, medical and other industries for materials such as high str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/02B21C25/02
Inventor 康志新林楷张俊逸
Owner SOUTH CHINA UNIV OF TECH
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