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A refinement method of cualmn shape memory alloy grains

A technology of memory alloy and grain, which is applied in the field of changing the physical structure of copper-based alloys, can solve the problems of limited refinement effect, and achieve the effects of low cost, obvious grain refinement effect, and easy large-scale production

Active Publication Date: 2017-05-17
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a refinement method for CuAlMn shape memory alloy crystal grains, by designing a new type of inoculant and using its metamorphic refinement effect to refine the crystal grains of the CuAlMn shape memory alloy to be refined, It overcomes the defect of the limited effect of refining CuAlMn shape memory alloys in the prior art, so that the mechanical properties and low temperature damping properties of the existing CuAlMn shape memory alloys are significantly improved at the same time

Method used

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  • A refinement method of cualmn shape memory alloy grains
  • A refinement method of cualmn shape memory alloy grains
  • A refinement method of cualmn shape memory alloy grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The first step is to prepare the inoculant Cu 51 Zr 14 :

[0039] Press Cu 51 Zr 14 The atomic ratio of the components shown is Cu:Zr=51:14, respectively weigh the raw material pure Cu and pure Zr of the required quality for batching, and then put it into a non-consumable vacuum arc furnace, and evacuate to 5 × 10 -3 After Pa, power on and arc smelting, and pouring after all the ingredients are melted. In order to ensure the uniformity of the alloy composition, the alloy obtained by pouring is turned upside down and re-melted under the same conditions as above. Repeat this for 3 times to obtain Cu 51 Zr 14 inoculant, and then to the prepared inoculant Cu 51 Zr 14 Pulverized, ready to use;

[0040] The second step is the refinement of CuAlMn shape memory alloy grains:

[0041] Take the copper-based shape memory alloy with the composition ratio of Cu-11.9%Al-2.5%Mn of the required mass and melt it in an intermediate frequency induction furnace, then move it to a p...

Embodiment 2

[0045] The first step is to prepare the inoculant Cu 51 Zr 14 :

[0046] Press Cu 51 Zr 14 The atomic ratio of the components shown is Cu:Zr=51:14, respectively weigh the raw material pure Cu and pure Zr of the required quality for batching, and then put it into a non-consumable vacuum arc furnace, and evacuate to 5 × 10 -3 After Pa, start energization and start arc melting. After all the ingredients are melted, pour it. In order to ensure the uniformity of the alloy composition, the alloy obtained by pouring is turned upside down and re-melted under the same conditions as above. Repeat this for 4 times to obtain Cu 51 Zr 14 inoculant, and then to the prepared inoculant Cu 51 Zr 14 Pulverized, ready to use;

[0047] The second step is the refinement of CuAlMn shape memory alloy grains:

[0048] Take the copper-based shape memory alloy with the composition ratio of Cu-11.9%Al-2.5%Mn of the required mass and melt it in an intermediate frequency induction furnace, then mo...

Embodiment 3

[0052] The first step is to prepare the inoculant Cu 51 Zr 14 :

[0053] Press Cu 51 Zr 14 The atomic ratio of the components shown is Cu:Zr=51:14, respectively weigh the raw material pure Cu and pure Zr of the required quality for batching, and then put it into a non-consumable vacuum arc furnace, and evacuate to 5 × 10 -3 After Pa, power on and arc smelting, and pouring after all ingredients are melted. In order to ensure the uniformity of alloy composition, the alloy obtained by pouring is turned upside down and re-melted under the same conditions as above. Repeat this for 5 times to obtain Cu 51 Zr 14 inoculant, and then to the prepared inoculant Cu 51 Zr 14 Pulverized, ready to use;

[0054] The second step is the refinement of CuAlMn shape memory alloy grains:

[0055] Take the copper-based shape memory alloy with the composition ratio of Cu-11.9%Al-2.5%Mn of the required mass and melt it in an intermediate frequency induction furnace, then move it to a pit cruci...

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Abstract

The invention provides a refining method for CuAlMn shape memory alloy grains and relates to a physical structure for changing a copper base alloy. The refining method includes the steps that a nucleating agent Cu51Zr14 is prepared; the copper base shape memory alloy containing, by mass percentage, 11.9% of Cu, 2.5% of Al and the balance Mn is taken to be put into a medium-frequency induction furnace to be molten and then is moved into a well type crucible furnace, the temperature is kept at 1090 DEG C to 1100 DEG C for 5 minutes to 8 minutes, and then the smashed nucleating agent Cu51Zr14 accounting for 0.1% to 1.0% the total mass of the copper base shape memory alloy is put into the furnace to be stirred for 10 seconds to 15 seconds and is poured into a steel die after residues are removed, so that refining of the CuAlMn shape memory alloy grains is completed. By the adoption of the refining method, the defect that the refining effect on the CuAlMn shape memory alloy is limited is overcome, and the mechanical property and the low-temperature damping performance of the existing CuAlMn shape memory alloy are improved remarkably at the same time.

Description

technical field [0001] The technical solution of the invention relates to changing the physical structure of copper-based alloys, in particular to a method for refining CuAlMn shape memory alloy crystal grains. Background technique [0002] Copper-based shape memory alloy is an important class of damping materials. In addition to high damping capacity, this type of material also has excellent shape memory performance and high electrical and thermal conductivity. In addition, compared with NiTi shape memory alloy The price is low, and it has received more and more attention in recent years. However, as a class of practical materials, copper-based shape memory alloys are still prone to intergranular fracture, resulting in poor strength and toughness, which has seriously hindered the further development and application of this type of material. Therefore, it is imperative to study the strengthening and toughening of copper-based shape memory alloys. People's in-depth research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C9/01C22F1/08
CPCC22C1/02C22C9/01C22F1/006C22F1/08
Inventor 王清周崔春翔殷福星杨涧李波李楠
Owner HEBEI UNIV OF TECH
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