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Method for improving aluminum-zirconium-based amorphous alloy friction stir welding joint strength

A zirconium-based amorphous alloy and friction stir technology, applied in welding equipment, non-electric welding equipment, welding/welding/cutting items, etc., can solve problems such as limited quantity, reduced performance stability of welded joints, and difficult quality control, etc., to achieve Effects of improving strength, reducing welding defects, and improving reliability

Active Publication Date: 2012-05-23
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

[0005] At present, the research reports on friction stir welding of Al / Zr amorphous alloy dissimilar metals are not only very limited (D.Wang, B.L.Xiao, Z.Y.Ma and H.F.Zhang, Scripta Materialia, Vol.60(2007)pp.112-115), And the joint quality is not stable enough
This is mainly due to the fact that there is no systematic reasonable selection of process parameters, welding tools relative to the weld position, and advancing side materials, resulting in a large difference in deformation ability between Zr-based amorphous and aluminum alloys, which are broken into larger sizes during the welding process. (>100μm) particles are brought into the welding center area (stirring zone) aluminum alloy, and these particles crack under low stress during the stretching process, causing the stirring zone to crack before the heat-affected zone, so that the performance of the welded joint is stable decreased sex
At present, no systematic research has reported the influence of the welding process parameter range, the relative position of the welding tool and the weld seam, and the selection of the advancing side material on the microstructure and properties. come difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Use a 3mm diameter stirrer for 5083 Al alloy and Zr 55 Cu 30 Al 10 Ni 5 The friction stir welding of the amorphous alloy plate is carried out, the tool speed is 1500rpm / min, the welding speed is 100mm / min, the welding tool is biased to the Al side, the distance (offset) between the welding tool axis and the weld seam is 1.2mm, and the amorphous is the forward side. Microscopic examination showed that no amorphous particles with a size exceeding 40 μm were observed inside the weld, and no crystallization occurred in the amorphous. Tensile tests show that the fracture of the welded joint occurs on the Al side, and the tensile strength of the welded joint is 90% of that of the 5083 Al base metal.

Embodiment 2

[0018] 2024 Al alloy and Zr using a 3 mm diameter stirrer 55 Cu 30 Al 10 Ni 5 The friction stir welding of the amorphous alloy plate is carried out, the tool speed is 600rpm / min, the welding speed is 100mm / min, the welding tool is biased to the amorphous side, the bias is 1.2mm, and the aluminum is placed on the forward side. Microstructural examination shows that the weld is uniform, without amorphous particles with a size exceeding 20 μm, and is amorphous without crystallization. Tensile experiments showed that the fracture occurred on the Al side, and the tensile strength of the welded joint was 75% of that of 2024 Al.

Embodiment 3

[0022] Use a 3mm diameter stirrer for 7075 Al alloy and Zr 55 Cu 30 Al 10 Ni 5 The friction stir welding of the amorphous alloy plate is performed, the tool speed is 600rpm / min, the welding speed is 200mm / min, the welding tool is biased to the aluminum side, the bias is 1.2mm, and the amorphous is placed on the forward side. The microstructure inspection showed that the weld was uniform and free of defects, and no amorphous particles with a size exceeding 40 μm were found, indicating that the weld was amorphous without crystallization. Tensile experiments showed that the fracture occurred on the Al side, and the tensile strength of the welded joint was 76% of that of 7075 Al.

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Abstract

The invention provides a method for improving aluminum-zirconium-based amorphous alloy friction stir welding joint strength. The position of a welding tool is changed according to different welding parameters; correspondingly, the distance advancing side material and the distance from the axis of the welding tool to the weld are adjusted to ensure the materials at the two sides of the weld to make coordinated flow deformation and to be evenly mixed without rough amorphous grains in the weld, preventing the amorphous alloy from crystallization or chemical reaction with aluminum due to overheating; thus an ideal weld microstructure and a stable joint performance are realized.

Description

technical field [0001] The invention relates to amorphous alloys and metal materials, and in particular provides a friction stir welding method for improving the connection strength of zirconium-based amorphous alloys and aluminum alloys, which is suitable for the connection of aluminum-zirconium-based amorphous alloy heterogeneous metal plates. Background technique [0002] Zirconium (Zr)-based amorphous alloys have high strength, high hardness, high elasticity, good wear resistance, ideal electromagnetic, optical, thermophysical properties and excellent corrosion resistance, and the crystallization temperature and glass transition temperature range are relatively large. Wide, superplastic moldable in this area. Therefore, it has a wide application background in the fields of aerospace, weapons, electronics, precision instruments, energy and sporting goods. For example, the newly developed zirconium-based amorphous not only has the above excellent mechanical properties but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K103/18
Inventor 马宗义肖伯律王东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI