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A kind of cualmn shape memory alloy and preparation method thereof

A memory alloy and alloy ingot technology is applied in the fields of CuAlMn shape memory alloy and its preparation, shape memory alloy and its preparation, and achieves the effects of efficient preparation, favorable for directional growth, and simple directional annealing process

Active Publication Date: 2020-12-04
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, neither of these two methods utilize the directional grain boundary migration mechanism of abnormal grain growth to promote the directional growth of single crystal CuAlMn shape memory alloys and improve the preparation efficiency of single crystal CuAlMn shape memory alloys.

Method used

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  • A kind of cualmn shape memory alloy and preparation method thereof
  • A kind of cualmn shape memory alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The molar percentages are: Al 17.0%, Mn 12.0%, Cu 71.0%. Weigh oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity of 99.99%. times, and finally get alloy ingots. The alloy ingots were hot rolled to a thickness of 20 mm and then cold rolled to a thickness of 10 mm. Install the rolled sample on the pull rod connected to the servo motor in the directional annealing furnace, close the directional annealing furnace cover, and evacuate to ~10-3Pa, and the upper end of the sample is consistent with the hot zone. The temperature of the hot zone is 900°C, the width of the hot zone is 20mm, the temperature gradient is 120°C / mm, and the moving speed of the shape memory alloy material relative to the hot zone is 15μm / s. Subsequently, the orientation zone was quenched at 900°C to obtain a columnar crystal CuAlMn shape memory alloy with a grain length of more than 5mm and a width of more than 1mm. figure 1 shown. Then the cyclic tensile test was car...

Embodiment 2

[0047] The molar percentages are: Al 18.0%, Mn 12.0%, Cu 70.0%. Weighing oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity greater than 99.9% are placed in a copper crucible, vacuumed, and arc smelted , repeated smelting 5-6 times to obtain alloy ingots. The alloy ingot was heated to 800°C and hot-rolled to a thickness of 2 mm, and then cold-rolled to a thickness of 1 mm. Install the rolled sample on the pull rod connected to the servo motor in the directional annealing furnace, the upper end of the sample is consistent with the hot zone, close the directional annealing furnace cover, and evacuate to ~10-3Pa. The temperature of the hot zone is adjusted to 900°C, the width of the hot zone is 20mm, and the temperature gradient is 100°C / mm, so that the moving rate of the alloy material relative to the hot zone is 30 μm / s to pass through the above temperature field. Then the CuAlMn shape memory alloy is quenched to obtain the columnar crystal shap...

Embodiment 3

[0049] The molar percentages are: Al 17.5%, Mn 12.0%, Cu 70.5%. Weigh oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity of 99.99%. times, and finally get alloy ingots. Alloy ingots were extruded into alloy rods up to 10 mm in diameter. Then install the sample on the pull rod connected to the servo motor in the directional annealing furnace, close the directional annealing furnace cover, and evacuate to ~10-3Pa, and the upper end of the sample is consistent with the hot zone. The temperature of the hot zone is 900°C, the thickness of the hot zone is 10mm, the temperature gradient is 85°C / mm, and the moving rate of the shape memory alloy material relative to the hot zone is 20 μm / s. The single crystal CuAlMn shape memory alloy is obtained by directional annealing. The sample was taken out and placed in a muffle furnace and heated to 500°C for 10 minutes, then heated to 900°C for 60 minutes, then cooled to 500°C for 10 minutes, and after 4 cycles...

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Abstract

The invention provides CuAlMn shape memory alloy and a preparation method thereof. The alloy is prepared from the following component by mass percentage: 12.0-20.0% of Al, 7.0-15.0% of Mn and the balance of Cu; the preparation method of the alloy comprises the following steps: (1) selecting Cu, Al and Mn and proportioning according to the alloy composition, and then smelting in a crucible to obtain an alloy ingot; (2) deforming the alloy ingot to obtain a sample to be used; (3) enabling the sample to be used to be subjected to regional heating, arranging a temperature field having a temperature gradient near a heating region, and enabling the sample to be subjected to directional annealing after passing through the heating region and the temperature field; (4) then, adopting a cyclic heattreatment method, an orientation annealing method or a cyclic heat treatment and orientation annealing combined method to obtain the CuAlMn shape memory alloy having a single crystal or a columnar crystal structure. The method provided by the invention uses the directional annealing to realize directional grain boundary migration of the CuAlMn shape memory alloy in an abnormal grain growth process, thus being beneficial to the directional growth of crystals; the method is simple in directional annealing process, is not limited by the sizes and shapes of products, and can be used for efficiently preparing the large-size single-crystal CuAlMn shape memory alloy.

Description

technical field [0001] The invention relates to a shape memory alloy and a preparation method thereof, in particular to a CuAlMn shape memory alloy and a preparation method thereof, and belongs to the technical field of alloy materials and preparation thereof. Background technique [0002] Shape memory alloy is a material with shape memory function, which can change its phase composition by being affected by magnetic field, temperature field or stress field, and realize the effect of returning to its original shape through phase transformation. In addition, in a certain temperature range, the shape memory alloy can automatically return to the shape before the stress after the stress is unloaded. This behavior is called superelasticity or pseudoelasticity. Because shape memory alloys have the above properties, they can be widely used in many fields including sensors, brakes, microcontrollers, biomedicine, shock absorption and noise reduction. Among various shape memory alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/01C22C1/02C22F1/08
CPCC22C1/02C22C9/01C22F1/006C22F1/08
Inventor 张中武崔烨辛显亮陈丹张洋孙利昕
Owner HARBIN ENG UNIV
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