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Compound rear earth additive for low-aluminum high-manganese CuAlMn low-temperature memory alloy

A technology for compounding rare earth and memory alloys, which is applied in the field of memory alloys and can solve problems such as increased addition, decreased alloy toughness, and difficulties

Inactive Publication Date: 2012-10-31
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Mn will volatilize during the preparation and heat treatment of the alloy, which makes the composition of the CuAlMn alloy change greatly before and after vacuum smelting and vacuum heat treatment, and the volatilization of Mn after each different heat treatment is also different, so it is difficult to It is even more difficult to obtain an alloy with the same composition as the design, and it is even more difficult to obtain an ideal shape memory alloy with a low-temperature martensitic transformation temperature
For low-aluminum high-manganese CuAlMn low-temperature memory alloys, in addition to reducing the volatilization of Mn, it is also necessary to improve the problem that the toughness of the alloy decreases due to the increase in the amount of Mn added.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0005] To prepare low-aluminum high-manganese CuAlMn low-temperature memory alloy, the chemical composition is Al14wt%, Mn8wt%, compound rare earth additive 0.3wt%, and the rest is copper for melting in a vacuum induction furnace. After the alloy is smelted, when the temperature of the alloy liquid reaches 1280-1300°C, keep it warm for 5 minutes, and then pour it into an ingot with a diameter of φ80×150mm in a vacuum induction furnace. After the ingot is cooled, annealing treatment is carried out. The annealing treatment is heated to 840°C for 24 hours and then cooled with the furnace, then turned to remove the surface 2-3mm, forged to 30×30mm bars, forging temperature 800-840°C, It is then extruded into a Φ4mm wire at an extrusion temperature of 650-680°C, and finally cold-drawn into a Φ0.5-2mm wire. Then carry out vacuum heat treatment. The specific process is: 860 ° C for 30 minutes and then quenched into room temperature oil, then 170 ° C in oil (30 minutes of heat preserv...

Embodiment 2

[0007] To prepare low-aluminum high-manganese CuAlMn low-temperature memory alloy, the chemical composition is Al15wt%, Mn8.5wt%, compound rare earth additive 0.8wt%, and the rest is copper for melting in a vacuum induction furnace. After the alloy is smelted, when the temperature of the alloy liquid reaches 1280-1300°C, keep it warm for 5 minutes, and then pour it into an ingot with a diameter of φ80×150mm in a vacuum induction furnace. After the ingot is cooled, annealing treatment is carried out. The annealing treatment is heated to 840°C for 24 hours and then cooled with the furnace, then turned to remove the surface 2-3mm, forged to 30×30mm bars, forging temperature 800-840°C, It is then extruded into a Φ4mm wire at an extrusion temperature of 650-680°C, and finally cold-drawn into a Φ0.5-2mm wire. Then carry out vacuum heat treatment. The specific process is: 860 ° C for 30 minutes and then quenched into room temperature oil, then 170 ° C in oil (30 minutes of heat prese...

Embodiment 3

[0009] To prepare low-aluminum high-manganese CuAlMn low-temperature memory alloy, the chemical composition is Al16wt%, Mn9wt%, compound rare earth additive 0.6wt%, and the rest is copper for melting in a vacuum induction furnace. After the alloy is smelted, when the temperature of the alloy liquid reaches 1280-1300°C, keep it warm for 5 minutes, and then pour it into an ingot with a diameter of φ80×150mm in a vacuum induction furnace. After the ingot is cooled, annealing treatment is carried out. The annealing treatment is heated to 840°C for 24 hours and then cooled with the furnace, then turned to remove the surface 2-3mm, forged to 30×30mm bars, forging temperature 800-840°C, It is then extruded into a Φ4mm wire at an extrusion temperature of 650-680°C, and finally cold-drawn into a Φ0.5-2mm wire. Then carry out vacuum heat treatment. The specific process is: 860 ° C for 30 minutes and then quenched into room temperature oil, then 170 ° C in oil (30 minutes of heat preserv...

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Abstract

The invention discloses a compound rear earth additive for a low-aluminum high-manganese CuAlMn low-temperature memory alloy and belongs to the technical field of memory alloys. The additive is characterized in that the chemical composition comprises 20-28wt% of yttrium, 8-15wt% of lanthanum, 5-12wt% of cerium, 10-18% of niobium, praseodymium, europium, gadolinium, terbium, holmium, erbium, thulium and lutetium, 2-6wt% of wolfram, 2-5wt% of boron, 2-5wt% of zirconium and the balance copper. The compound rear earth additive is a lump-shaped alloy, the melting point range is from 800 DEG C to 1200 DEG C, and the adding amount range of the compound rear earth additive is in the range from 0.3wt% to 0.8wt%.

Description

technical field [0001] The invention belongs to the technical field of memory alloys, in particular to a composite rare earth additive for low-aluminum high-manganese CuAlMn low-temperature memory alloys. Background technique [0002] In CuAlMn memory alloy, by adding Mn, the eutectoid transformation of high-temperature β-phase during and after quenching can be suppressed, the brittleness of β-phase can be reduced, and the martensitic transformation temperature and ordering temperature can be controlled to obtain a good low-temperature shape. memory performance. For low-temperature CuAlMn alloys (below Ms150K) with good shape memory properties, there are no diffraction peaks of other phases in the XRD spectrum after quenching except for the diffraction peaks of the β phase, and the higher the ordered peaks, the better the shape memory properties of the alloy. The martensitic transformation temperature of CuAlMn memory alloy is very sensitive to its chemical composition, esp...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C9/00
Inventor 司松海刘光磊李晓薇刘海霞齐克尧杨嵩
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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