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Gamma phase-inhibited high temperature double-phase Ni-Mn-Ga-Gd alloy and preparation method thereof

An alloy and high-temperature technology, which is applied in the field of high-temperature dual-phase Ni-Mn-Ga-Gd alloy and its preparation, can solve the problems of deteriorating shape memory effect, etc., and achieve the effects of good processing performance, wide temperature range and low price

Inactive Publication Date: 2015-10-07
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the gamma phase in the existing high-temperature Ni-Mn-Ga series shape memory alloys suppresses the reverse martensitic transformation and deteriorates the shape memory effect, a gamma phase is provided by doping the alloy with rare earth element Gd. High temperature dual phase Ni-Mn-Ga-Gd alloy with phase suppressed

Method used

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  • Gamma phase-inhibited high temperature double-phase Ni-Mn-Ga-Gd alloy and preparation method thereof
  • Gamma phase-inhibited high temperature double-phase Ni-Mn-Ga-Gd alloy and preparation method thereof
  • Gamma phase-inhibited high temperature double-phase Ni-Mn-Ga-Gd alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Take 58 parts of Ni, 25 parts of Mn, 16.5-16.9 parts of Ga and 0.1-0.5 parts of rare earth element Gd according to the atomic percentage and put them into the vacuum non-consumable electrode electric arc furnace in the following order: first put the Mn sheet At the bottom of the melting crucible, place the rare earth Gd and Ga, and finally place the Ni sheet, then close the vacuum furnace, and evacuate the electric arc furnace to 5×10 -3 Pa, and then filled with inert gas until the vacuum degree in the furnace is 2×10 -2 Pa, arc melting for 20 minutes at a temperature of 2000°C and a melting current of 80A. Each sample was turned over and melted four times and magnetically stirred. Then the melted sample was made into a button-shaped sample, and it was taken out after cooling. Then it is cut by wire cutting method, and the alloy block after cleaning and cutting with acetone is sealed in a vacuum degree of 10 -1 In a Pa quartz tube, keep it warm at 850°C for 24 hours, a...

Embodiment 2

[0028] Take 58 parts of Ni, 25 parts of Mn, 16.5-16.9 parts of Ga and 0.1-0.5 parts of rare earth element Gd according to the atomic percentage and put them into the vacuum non-consumable electrode electric arc furnace in the following order: first put the Mn sheet At the bottom of the melting crucible, place the rare earth Gd and Ga, and finally place the Ni sheet, then close the vacuum furnace, and evacuate the electric arc furnace to 5×10 -3 Pa, and then filled with argon until the vacuum degree in the furnace is 2×10 -2 Pa, arc melting for 20 minutes at a temperature of 3000°C and a melting current of 100A. Each sample was turned over and melted four times and magnetically stirred, and then the melted sample was made into a button-shaped sample, which was cooled and taken out. Then it is cut by wire cutting, and the cut alloy block is sealed with a vacuum degree of 10 after cleaning with acetone. -1 In a Pa quartz tube, keep it warm at 850°C for 24 hours, and then quench ...

Embodiment 3

[0030] Take 58 parts of Ni, 25 parts of Mn, 16.5-16.9 parts of Ga and 0.1-0.5 parts of rare earth element Gd according to the atomic percentage and put them into the vacuum non-consumable electrode electric arc furnace in the following order: first put the Mn sheet At the bottom of the melting crucible, place the rare earth Gd and Ga, and finally place the Ni sheet, then close the vacuum furnace, and evacuate the electric arc furnace to 5×10 -3 Pa, and then filled with inert gas until the vacuum degree in the furnace is 2×10 -2 Pa, arc melting for 18 minutes at a temperature of 2500°C and a melting current of 100A. Each sample was turned over and melted four times and magnetically stirred, and then the melted sample was made into a button-shaped sample, which was cooled and taken out. Then it is cut by wire cutting, and the cut alloy block is sealed with a vacuum degree of 10 after cleaning with acetone. -1 In a Pa quartz tube, keep it warm at 800°C for 24 hours, and then que...

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Abstract

The invention concretely relates to a gamma phase-inhibited high temperature double-phase Ni-Mn-Ga-Gd alloy and a preparation method thereof. The structural general formula of the alloy is represented by Ni58Mn25Ga17-xGdx, and x in the general formula is 0.1-0.5. The gamma phase of the Ni58Mn25Ga17-xGdx alloy obtained through material taking, arc melting, cleaning, heat insulation and quenching in water is obviously reduced, and is about 80-40% lower than that of present Ni58Mn25Ga17 alloy; and the martensite phase transition temperature of the Ni58Mn25Ga17-xGdx alloy is 387.5-461.4DEG C, and the temperature range is wide, so demands of different fields are met. Raw materials required in the invention are cheap and have abundant reserves, the alloy material prepared in the invention has the advantages of good toughness, large strength and good processing property, and can be processed to form various shapes as needed, and the preparation method has the advantages of simple process, easy industrial production, and development of a new idea for application of high-temperature and high-plasticity shape memory alloys.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to a high-temperature dual-phase Ni-Mn-Ga-Gd alloy with suppressed γ phase and a preparation method thereof. Background technique [0002] Shape memory alloy has a unique shape memory effect (SME) and superelasticity, and is a promising smart material. Due to engineering fields such as aerospace, nuclear power, electrical machinery, fire protection, chemical industry, oil and gas exploration, etc. However, the martensitic transformation temperature of the relatively mature shape memory alloys currently developed does not exceed 120 °C, which greatly limits its application fields. Therefore, the development of high-temperature memory alloys has always been one of the key research directions in the field of shape memory alloys. [0003] At present, the high-temperature shape memory alloys that have been studied mainly include: Ti-Ni-X (X=Pt, Pd, Au, Hf, Zr) base, Cu-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02
Inventor 董桂馥
Owner DALIAN UNIV
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