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Preparation method of gradient functional material based on friction-stir welding

A gradient functional material and friction stir technology, applied in welding equipment, non-electric welding equipment, manufacturing tools, etc., can solve the problems of high preparation cost, poor interface bonding effect, complicated preparation process, etc., and achieve low preparation cost and avoid cracks Effect

Inactive Publication Date: 2018-10-02
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of high temperature and high pressure environment, expensive and scarce equipment, complicated preparation process, high preparation cost, poor interface bonding effect and serious pollution in the process of preparing functionally gradient materials, the present invention provides a functionally gradient material based on friction stir welding preparation method, so as to obtain functionally gradient materials with excellent performance

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Examples

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preparation example Construction

[0039] A method for preparing functionally graded materials based on friction stir welding, adopting friction stir welding, adding reinforcing phase materials gradiently in the welding direction of the stirring head, relying on the mutual friction between the stirring head and the substrate welding area to generate heat, so that The plastic softening of the substrate welding area causes the material in the substrate welding area to drive the reinforcement phase material to undergo plastic flow under the action of the stirring head, so that the substrate welding area material and the reinforcement phase material form a uniform gradient functional material; set the welding direction of the stirring head It is the X direction, the direction parallel to the substrate plane and perpendicular to the welding direction is the Y direction, and the direction perpendicular to the substrate plane is the Z direction; the stirring head of the friction stir welding will form a trapezoid after ...

Embodiment 1

[0049] What this example prepared was aluminum / silicon carbide gradient functional material. The size of the stirring head used in this example and some process parameters were respectively: the diameter of the shoulder of the stirring head was 11mm, that is, M=11mm, and the depression of the shoulder was 0.2mm. The diameter of the stirring pin of the head is 4.4mm, that is, N=4.4mm, the length is 2.8mm, the inclination angle of the main shaft is 2°, the rotation speed of the stirring head is 875r / min, and the forward speed of the stirring head in friction stir processing is 36mm / min. The material is 6061Al, the thickness of the aluminum substrate is 3mm, that is h=3mm:

[0050] (1) Preparation of raw materials: Before the friction stir processing, the inventor polished, cleaned and dried the surface of the aluminum substrate, and then used the VDL1000 end milling machine of Dalian Machine Tool Factory to process the welding area in the welding direction of the aluminum substra...

Embodiment 2

[0062] What this example prepared was an aluminum / copper gradient functional material, and the size of the stirring head used in this example and some process parameters were the same as in Example 1:

[0063] (1) Preparation of raw materials: Before the friction stir processing, the inventor polished, cleaned and dried the surface of the aluminum substrate, and then used the VDL1000 end milling machine of Dalian Machine Tool Factory to process the welding area in the welding direction of the aluminum substrate stirring head, such as figure 2 A right-angled triangular prism groove shown, where A=2mm, B=2.5mm, H=40mm;

[0064] (2) Clamping of raw materials: use clamps to clamp the aluminum substrate on the workbench;

[0065] (3) Add reinforcement phase material: the melting point of aluminum is about 660°C, the melting point of copper is about 1083°C, and the melting point difference is less than 500°C, so the state of copper reinforcement phase material can be powder or soli...

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Abstract

The invention discloses a preparation method of a gradient functional material based on friction-stir welding. The preparation method comprises the following steps: adding a reinforced phase materialto a substrate by means of a right-angled triangular prism groove structural design on the substrate; and generating heat by mutual friction of a stirring head and a material in a substrate welding region, wherein the substrate welding region is softened plastically and the material in the substrate welding region drives the reinforced phase material to flow plastically under the action of the stirring head, so as to form a uniform gradient functional material from the material in the substrate welding region and the reinforced phase material. The method disclosed by the invention does not need special environments such as vacuum, temperature, electric field and magnetic field, and is low in preparation cost; by means of a solid state processing mode, formation of cracks, pores and oxidesin the material can be avoided effectively, and the gradient functional material which is high in compactness and uniform to mix can be obtained. Various types of gradient functional materials can beprocessed; the preparation method is a green processing technology, and the gradient functional material which is higher in mechanical property can be obtained.

Description

technical field [0001] The invention belongs to the field of preparation of gradient functional materials, and relates to a preparation method of gradient functional materials based on friction stir welding. Background technique [0002] Gradient functional material refers to a functional material whose elements (composition, structure) change along a certain dimension, so that the physical, chemical and mechanical properties of the material have corresponding gradient changes in space. Functionally graded materials used as coatings and interface layers can improve bond strength, reduce residual stress and thermal stress, reduce crack driving force, and enhance connection strength. In recent years, the application of functionally graded materials has expanded from the initial aerospace field to biomedicine, optoelectronic engineering, energy industry, nuclear engineering, mechanical processing and other fields. [0003] There are many classifications of functionally gradien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24
Inventor 呼咏吴彤王文阳赵宏伟宋明凯付忠国王宇郭悦石栋田济语
Owner JILIN UNIV
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