High-strength high-conductivity aluminum-scandium alloy as well as preparation method thereof and use thereof

A high-conductivity, high-strength technology, applied in the direction of metal/alloy conductors, conductors, circuits, etc., can solve the problems of increasing material manufacturing processes and time, small aluminum alloy metamorphism, low strength and elongation, etc. The effect of smooth process, good plastic workability and excellent mechanical properties

Active Publication Date: 2017-05-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this invention technology are: the addition of Sc element exceeds its maximum solid solubility in aluminum, and cannot achieve the best contribution effect in improving the electrical conductivity; too high melting temperature will easily lead to large burning loss, and the composition is not easy to control; In addition, the yield strength of the wire material is low
The disadvantages of this invention technology are: the boronization process increases the material manufacturing process and time; the addition of Sc elements is less, the effect on the modification of aluminum alloy is small, the strength and elongation are low, and the aluminum wire is prone to brittle fracture
[0005] At present, domestic aluminum alloy wire materials are generally unable to increase the electrical conductivity to above 61% IACS while ensuring high strength and high toughness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition elements of the wire material are: Sc0.3wt%, Zr0.1wt%, Mn0.2wt%, Fe, Si and other impurity elements content≤0.1%, the rest is Al.

[0031] According to the ratio, put the aluminum ingot with a purity ≥99.9% in a graphite crucible of an intermediate frequency induction melting furnace to melt it. After it is completely melted, the temperature of the molten aluminum is 660°C to 670°C, and then add Al-2%Sc to the molten aluminum in turn. Master alloy, Al-10% Zr master alloy, Al-10% Mn master alloy, heat up to 730°C for full stirring after the alloy is melted, then stand for 20 minutes to refine and degas at 720°C, and let the melt stand for 20 minutes after deslagging , at 700°C, the molten metal was quickly poured into an aluminum alloy ingot; after the surface of the ingot was treated brightly, the ingot was preheated and then hot-extruded at an extrusion ratio of 25, and the extrusion temperature was 300°C; Heat treatment of the bar, heat preservation at...

Embodiment 2

[0033] The composition elements of the wire material are: Sc0.35wt%, Zr0.15wt%, Mn0.2wt%, the content of other impurity elements such as Fe and Si≤0.1%, and the rest is Al.

[0034] According to the ratio, put the aluminum ingot with a purity ≥99.9% in a graphite crucible of an intermediate frequency induction melting furnace to melt it. After it is completely melted, the temperature of the molten aluminum is 660°C to 670°C, and then add Al-2%Sc to the molten aluminum in turn. Master alloy, Al-10% Zr master alloy, Al-10% Mn master alloy, heat up to 730°C for full stirring after the alloy is melted, then stand for 20 minutes to refine and degas at 720°C, and let the melt stand for 20 minutes after deslagging , at 700°C, the molten metal was quickly poured into an aluminum alloy ingot; after the surface of the ingot was treated brightly, the ingot was preheated and then hot-extruded at an extrusion ratio of 25, and the extrusion temperature was 300°C; Heat treatment of the bar, ...

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Abstract

The invention provides a high-strength high-conductivity aluminum-scandium alloy as well as a preparation method thereof and a use thereof. The alloy consists of the following components in percentage by weight: 0.2-0.4 wt% of scandium (Sc), 0.01-0.15 wt% of zirconium (Zr), 0.1-0.3 wt% of manganese (Mn), less than or equal to 0.1% of other impurity elements, and the balance Al. The preparation method for the high-strength high-conductivity aluminum-scandium alloy comprises the following steps of: taking a pure Al ingot, an AlSc intermediate alloy, an AlZr intermediate alloy and an AlMn intermediate alloy as raw materials, putting the raw materials into a smelting furnace in proportion, and performing casting to obtain a cast ingot after performing stirring, refining, purifying, degassing, slagging-off and standing on melt; extruding the cast ingot into an aluminum alloy rod in an extrusion ratio of 25; and performing staged thermal treatment on the rod, and drawing the rod into a high-strength aluminum alloy wire through a wire drawing machine. The Sc-containing aluminum alloy wire has conductivity greater than or equal to 61% IACs, has alloy tensile strength greater than 240 MPa, has yield strength greater than 160 MPa, has ductility of 8%, and has a long-term operation temperature which can be up to 200 DEG C.

Description

technical field [0001] The invention relates to a high-strength and high-conductivity aluminum-scandium alloy, a preparation method and application thereof, and belongs to the technical field of aluminum alloy conductor material manufacturing. Background technique [0002] Aluminum alloy has low density, high specific strength, good plasticity and processability, non-magnetic, excellent electrical conductivity, thermal conductivity and corrosion resistance, and has developed into the most promising metal conductor material to replace copper on transmission lines. my country has a huge demand for wires and cables. With the rapid increase in copper prices and the increasing scarcity of resources, the research and development and industrialization of aluminum alloy conductors have attracted much attention in recent years, but their quality problems cannot be avoided. In use, it is found that aluminum wires are easy to break, the strength and toughness are not high enough, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04C22C1/03H01B1/02H01B5/02
CPCC22C1/026C22C1/03C22C21/00C22F1/04H01B1/023H01B5/02
Inventor 应韬曾小勤谷立东王乐耘李德江丁文江
Owner SHANGHAI JIAO TONG UNIV
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