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Composite rare-earth modifier capable of improving thermal fatigue performance of copper-zinc-aluminium memory alloy

A technology of compound rare earth and memory alloy, applied in the field of compound rare earth modifier, can solve the problems of low performance requirements, short fatigue life, grain boundary damage, etc., and achieve the effects of improving thermal fatigue performance, refining grains, and optimizing structure

Inactive Publication Date: 2014-12-24
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the copper-based memory alloy has good shape memory effect and low price, the prospect is very attractive, but in the practical process, it is found that there are problems such as martensite stabilization, poor ductility, prone to grain boundary damage, and short fatigue life. , so it is only used when performance requirements are not high and cost reduction is required

Method used

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  • Composite rare-earth modifier capable of improving thermal fatigue performance of copper-zinc-aluminium memory alloy
  • Composite rare-earth modifier capable of improving thermal fatigue performance of copper-zinc-aluminium memory alloy

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Effect test

Embodiment 1

[0012] Electrolytic copper, No. 0 zinc ingot, No. A00 aluminum ingot, No. 1 electrolytic nickel, compound rare earth modifier (optimized composition) are used as raw materials. The components are weighed according to the ratio of Zn25.25 wt %, Al3.75 wt %, Ni0.9 wt %, composite rare earth modifier 0.2 wt %, and the balance is Cu, and then melted in a medium frequency induction melting furnace. The smelting process is as follows: first add preheated electrolytic copper, electrolytic nickel, and aluminum ingots, and then add zinc ingots and compound rare earth modifiers. During the smelting process, a small amount of borax is added to cover, and the amount added is 0.15 wt % of the molten metal. After the material is completely melted, the temperature is raised to 1280°C-1300°C, and cast into an ingot with a diameter of φ80×150mm. The annealing treatment is heating to 820°C for 24 hours and then cooling with the furnace, then turning to remove the 2-3mm dezincification layer on ...

Embodiment 2

[0014] Electrolytic copper, No. 0 zinc ingot, No. A00 aluminum ingot, No. 1 electrolytic nickel, compound rare earth modifier (optimized composition) are used as raw materials. The components are weighed according to the ratio of Zn25.25 wt %, Al3.75 wt %, Ni0.9 wt %, composite rare earth modifier 0.7 wt %, and the balance is Cu, and then melted in a medium frequency induction melting furnace. The smelting process is as follows: first add preheated electrolytic copper, electrolytic nickel, and aluminum ingots, and then add zinc ingots and compound rare earth modifiers. During the smelting process, a small amount of borax is added to cover, and the amount added is 0.15 wt % of the molten metal. After the material is completely melted, the temperature is raised to 1280°C-1300°C, and cast into an ingot with a diameter of φ80×150mm. The annealing treatment is heating to 820°C for 24 hours and then cooling with the furnace, then turning to remove the 2-3mm dezincification layer on ...

Embodiment 3

[0016] Electrolytic copper, No. 0 zinc ingot, No. A00 aluminum ingot, No. 1 electrolytic nickel, compound rare earth modifier (optimized composition) are used as raw materials. The components are weighed according to the ratio of Zn25.25 wt %, Al3.75 wt %, Ni0.9 wt %, composite rare earth modifier 1.0 wt %, and the balance is Cu, and then melted in a medium frequency induction melting furnace. The smelting process is as follows: first add preheated electrolytic copper, electrolytic nickel, and aluminum ingots, and then add zinc ingots and compound rare earth modifiers. During the smelting process, a small amount of borax is added to cover, and the amount added is 0.15 wt % of the molten metal. After the material is completely melted, the temperature is raised to 1280°C-1300°C, and cast into an ingot with a diameter of φ80×150mm. The annealing treatment is heating to 820°C for 24 hours and then cooling with the furnace, then turning to remove the 2-3mm dezincification layer on ...

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Abstract

A composite rare-earth modifier capable of improving the thermal fatigue performance of copper-zinc-aluminium memory alloy is disclosed and belongs to the technical field of memory alloy preparation. The composite rare-earth modifier is characterized by comprising, 10-15 wt% of Nd, 10-15 wt% of La, 8-12 wt% of Y, 8-12 wt% of Ce, 5-8 wt% of Tb, 5-8 wt% of Gd, 10-20 wt% of Pr+Sc+Eu+Ho+Er+Tm+Lu, 3-6 wt% of Zr, 2-5 wt% of Ti, 2-5 wt% of B, and the balance copper. The composite rare-earth modifier is alloy blocks and has the melting point scope of 850-1150 DEG C, and addition scope of the composite rare-earth modifier is 0.2-1.0 wt%.

Description

technical field [0001] The invention belongs to the technical field of memory alloy preparation, in particular to a composite rare earth modifier for improving the thermal fatigue performance of copper-zinc-aluminum memory alloys. Background technique [0002] Since the discovery of copper-based memory alloys by Delat memory metal company in the UK, the research on copper-based memory alloys has begun rapidly. At present, among memory alloy materials, copper-based alloy materials account for the largest proportion. Although copper-based memory alloys are not as good as NiTi alloys in some properties, they are favored by a large number of researchers because of their easy processing, wide source of raw materials, and low cost (only 1 / 10 of NiTi alloys). Among the memory alloys that have been discovered, copper-based alloys account for the largest proportion, which can be mainly divided into two categories: Cu-Zn and Cu-Al, among which the CuZnAl system and CuAlNi system have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C30/02C22C9/04
Inventor 刘光磊王文华司松海李晓薇张扣山
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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