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Ultra-elastic memory heat treatment method for copper-base shape memory alloy obtained by thermal continuous casting

A heat treatment method and memory alloy technology are applied in the field of shape memory alloy materials and copper-based shape memory alloy superelastic memory heat treatment, which can solve the problems of low productivity and the like

Inactive Publication Date: 2008-03-26
江阴鑫裕装潢材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, at home and abroad, only Canada, Japan, and Guangdong University of Technology pull out thinner wires (1.0-2.0 mm), while the productivity is extremely low

Method used

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  • Ultra-elastic memory heat treatment method for copper-base shape memory alloy obtained by thermal continuous casting
  • Ultra-elastic memory heat treatment method for copper-base shape memory alloy obtained by thermal continuous casting
  • Ultra-elastic memory heat treatment method for copper-base shape memory alloy obtained by thermal continuous casting

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: memory superelastic heat treatment of copper-based memory alloy

[0032] 1. Hot type continuous casting

[0033] See Figure 1,

[0034]Put the Cu-Al-Ni alloy ingot with 13.2% Al, 4.2% Ni, and Cu as the balance in the graphite crucible of the hot-type continuous casting equipment to melt, and the temperature of the graphite crucible is kept at 1160°C; then the alloy liquid Through the conduit inserted into the graphite crucible and the post mold placed in the conduit, continuous drawing is carried out by the traction mechanism, the drawing speed is 20-60mm / min, and the diameter of the drawn casting is 4mm. The temperature of the mold is controlled at 1020-1060°C. After the passing wire leaves the mold, it is cooled by spraying water with a cooler at a distance of 40 mm from the mold. The water flow rate of the cooler is 100 liters / hour. Next, the following molding and heat treatment processes are carried out (as shown in Figure 2):

[0035] 2. Molding a...

Embodiment 2

[0049] Example 2: Recovery Superelastic (SE) Treatment of Semi-finished Products

[0050] 1. The alloy composition is Cu-Al-Be-X, containing 11% Al, 0.6% Be, 0.2% Cr, and the rest is Cu.

[0051] 2. After the Cu-Al-Be-X alloy ingot undergoes the steps 1) to 2) of Example 1, a soft SME 1.6 semi-finished wire is obtained.

[0052] 3. Due to the structural requirements of the spectacle frame, the 1.6 semi-finished wire is cold-pressed into a flat strip with a thickness of 0.9mm and a length of 80mm. In this state, a large number of dislocations are introduced due to cold deformation, which makes the SME disappear and the material becomes brittle.

[0053] 4. Place the flattened semi-finished flat strips in a single layer into a stainless steel tray, and put them into a box-type resistance furnace for quenching. The heating temperature is 950°C, the holding time is 500 seconds per mm of effective thickness of the product, and then the semi-finished product in the tray is quench...

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Abstract

The present invention relates to the heat treatment process for copper-base shape memory alloy obtained through hot mold continuous casting. The heat treatment process includes the following steps: passing the homogenized casting through the first tubular furnace at 400-700 deg.c and die drawing continuously at the speed of 50-100 mm / min to form wire, slat or irregular shaped material; passing the hot drawn material through the second tubular furnace at 900-1000 deg.c and spraying cold water to quench after leaving the furnace; passing through the third tubular furnace at 580-620 deg.c for ageing treatment; and heating in the fourth tubular furnace at 780-820 deg.c at the speed of 50-100 mm / min and spraying water to cool after leaving the furnace. The process has high production efficiency and the product has high elasticity.

Description

technical field [0001] The invention relates to a shape memory alloy (SMA), in particular to a copper-based shape memory alloy superelastic memory heat treatment method, which is a heat treatment technology for making the shape memory alloy obtain superelastic performance and memory performance. Mainly applicable to Cu-Al-Ni, Cu-Al-Be-X, Cu-Al-B-Mn and Cu-Al-Mn and other memory alloy wires, sheets, strips, rods to obtain memory performance (SME) or superelasticity Can (SE). It belongs to the technical field of shape memory alloy materials. Background technique [0002] In the martensitic (M) state of shape memory alloys, the material is soft and deformable; while in the austenitic state (A) it is strong and elastic. Below the critical temperature As, the material is in the martensitic state; at the critical temperature A f The above materials are in the austenitic (A) state. The temperature is between As~A f Between is the phase transition interval from M to A. The tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08B21C1/00
Inventor 董元源陈继忠周宏雷尹国洪崔联合韩亚楠
Owner 江阴鑫裕装潢材料有限公司