Manufacturing method of high-strength high-conductivity copper-chromium alloy
A technology of copper-chromium alloy and high conductivity, which is applied in the direction of metal/alloy conductors, conductors, circuits, etc., can solve the problems of weakening strengthening effect, product shape limitation, grain growth, etc., and achieve good conductivity and structural stability , easy to control, high wear resistance effect
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[0022] The invention describes a method for preparing a high-strength and high-conductivity copper-chromium alloy, the specific steps of which are as follows:
[0023] 1. The copper-chromium alloy plate with a thickness of 2-8 mm is subjected to solution treatment before processing, that is, the plate is heated to 950-1000 ° C for 60-150 minutes and then quenched in water to make a supersaturated solid solution structure.
[0024] 2. The solid solution treated copper-chromium alloy plate is fixed in the cooling tank by bolts.
[0025] 3. A tool head with a static shoulder and a movable stirring needle is used. The diameter of the static shoulder is generally 10-20mm, the diameter of the stirring needle inserted into the workpiece is 4-8mm, and the height is 2-8mm.
[0026] 4. Before processing, connect the stirring needle to the processing surface of the workpiece, and then pour cooling medium into the cooling tank. The cooling medium is generally liquid nitrogen, a mixture o...
Embodiment 1
[0034] A copper-chromium alloy (Cu-0.55Cr-0.2Zr) plate with a length of 120 mm, a width of 40 mm, and a thickness of 3 mm was subjected to solution treatment before processing. The solution temperature was 980 ° C, and water quenching was performed after holding for 90 minutes. Then fix the solution-treated plate in a low-temperature cooling tank, and use a liquid nitrogen cooling medium to cool the plate and the tool head for 20 minutes. Subsequently, a stirring pin with a static shoulder diameter of 12 mm, a diameter of 4 mm inserted into the workpiece, and a height of 2.9 mm was used for processing at a rotating speed of 1200 rpm and a traveling speed of 20 mm / min. The processed copper-chromium alloy samples were respectively annealed at 400, 450, and 500°C for 30 minutes.
[0035] The microstructure of the processed copper-chromium alloy was observed, and the results were as follows: figure 2 As shown, the processed zone is a fine nanocrystalline and ultrafine grain stru...
Embodiment 2
[0037]A piece of copper-chromium alloy (Cu-0.8Cr-0.1Zr) with a length of 120 mm, a width of 40 mm, and a thickness of 5 mm was subjected to solution treatment before processing. The solution temperature was 1000 ° C, and water quenching was performed after holding for 90 minutes. Then fix the solution-treated plate in the cooling tank of low-temperature friction stir processing, and use the cooling medium of liquid nitrogen and alcohol mixture to cool the plate and the tool head for 20 minutes. Subsequently, a stirring pin with a static shoulder diameter of 15 mm, a diameter of 4 mm inserted into the workpiece, and a height of 4.9 mm was used for processing at a rotating speed of 800 rpm and a traveling speed of 20 mm / min. The processed copper-chromium alloy samples were respectively annealed at 400, 450, and 500°C for 30 minutes.
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