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Preparation method of orientation-controllable Cu-Al-Mn shape memory alloy single crystals

A technology of memory alloy, cu-al-mn, applied in the field of preparation of single crystal of Cu-Al-Mn shape memory alloy with controllable orientation, achieving the effect of simple process and easy operation

Active Publication Date: 2018-03-27
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the current problem of single crystal orientation control of large-size Cu-Al-Mn shape memory alloys, and proposes to use columnar polycrystalline alloys with wire texture prepared by directional solidification as raw materials, and control the cyclic heat treatment system and process Parameters to ensure the orientation heredity during the single crystal growth process, so as to realize the preparation of single crystal alloy with controllable orientation

Method used

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  • Preparation method of orientation-controllable Cu-Al-Mn shape memory alloy single crystals
  • Preparation method of orientation-controllable Cu-Al-Mn shape memory alloy single crystals
  • Preparation method of orientation-controllable Cu-Al-Mn shape memory alloy single crystals

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Embodiment 1

[0034] Using oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity of 99.99% as raw materials, the prefabricated alloy is prepared by electromagnetic induction vacuum melting. The alloy composition is A1: 17.5at.%, Mn: 11at.%, and the rest is Cu. Alloy melting The temperature is 1300°C, and after 20 minutes of heat preservation, it is air-cooled to room temperature to obtain a prefabricated alloy with uniform composition.

[0035] The directional solidification method is used to prepare columnar crystal structure alloy plates with wire texture along the solidification direction. The specific process is: re-melting the prefabricated alloy at 1150 ° C, holding it for 20 minutes, and pouring it to the bottom for cooling in a water-cooled copper mold. Into the graphite crystallizer with heat preservation (holding temperature 1100°C) (turn off the heat preservation and heating device after pouring), the alloy is directional solidified from bottom to top...

Embodiment 2

[0039] Using oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity of 99.99% as raw materials, the prefabricated alloy is prepared by electromagnetic induction vacuum melting. The alloy composition is A1: 17.5at%, Mn: 11at.%, and the rest is Cu. The alloy melting temperature 1200°C, keep warm for 20 minutes and then air-cool to room temperature to obtain a prefabricated alloy with uniform composition.

[0040] The directional solidification method is used to prepare columnar crystal structure alloy plates with wire texture along the solidification direction. The specific process is: re-melting the prefabricated alloy at 1150 ° C, holding it for 20 minutes, and pouring it to the bottom for cooling in a water-cooled copper mold. Into the graphite crystallizer with heat preservation (heat preservation temperature 1100°C) (turn off the heat preservation and heating device after pouring), the alloy is directional solidified from bottom to top to obtain ...

Embodiment 3

[0043] Using oxygen-free copper, electrolytic aluminum and electrolytic manganese with a purity of 99.99% as raw materials, the prefabricated alloy is prepared by electromagnetic induction vacuum melting. The alloy composition is A1: 17at%, Mn: 11at.%, and the rest is Cu. The alloy melting temperature is 1200°C, heat preservation for 20 minutes and then air-cool to room temperature to obtain a prefabricated alloy with uniform composition.

[0044] The continuous directional solidification method is used to prepare columnar grain structure alloy rods with silk texture along the solidification direction. The specific process is: using the pull-down continuous directional solidification equipment, first re-melting the prefabricated alloy at 1200 ° C, and controlling the graphite mold The temperature is 1100° C., and the casting speed is 20 mm / min. A rod with a diameter of 10 mm was prepared. Bars with a length of 100 mm were cut.

[0045] The columnar polycrystalline Cu-Al-Mn ...

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Abstract

The invention relates to a preparation method of orientation-controllable Cu-Al-Mn shape memory alloy single crystals, belonging to the field of preparation of metal materials. The preparation methodcomprises the steps of firstly, preparing columnar polycrystalline Cu-Al-Mn shape memory alloy blank with <100> fiber texture along the solidification direction by adopting a directional solidification method; then, adopting a cyclic heat treatment method to enable the alloy crystal grains to continuously grow abnormally until growing into single crystals; meanwhile, controlling the cycle heat treatment system and process parameters to ensure that the crystal grain orientation has no obvious change in a single crystal growth process so as to obtain the Cu-Al-Mn shape memory alloy single crystals having near <001> orientation along the initial solidification direction. The preparation method, provided by the invention, of the single crystals realizes the orientation control of the solid phase transformation method in the single crystal growth process, and has the advantages of capability of preparing the large-sized single crystals (the single crystal sizes can reach 50 mm or more), easy orientation control, simple process, and the like.

Description

technical field [0001] The invention belongs to the field of metal material preparation and relates to a method for preparing a Cu-Al-Mn shape memory alloy single crystal with controllable orientation. Background technique [0002] Shape memory alloy is a smart material that integrates perception and actuation. It can be made into sensors, detectors, damping devices, energy converters, and smart microdevices. It is widely used in electronic communications, medical care, machinery manufacturing, aerospace, etc. , energy, chemical industry and daily life and many other fields. Cu-Al-Mn shape memory alloy has become one of the most potential shape memory alloys due to its low price, good shape memory performance, excellent damping and energy absorption performance, and easy processing, especially for the manufacture of large buildings, Shock absorbing device for large precision instruments. [0003] The superelasticity and shape memory effect of Cu-Al-Mn shape memory alloys h...

Claims

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Application Information

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IPC IPC(8): C30B29/52C30B11/00C30B33/02C22C9/05C22C9/01
Inventor 黄海友许胜王辉刘记立谢建新
Owner UNIV OF SCI & TECH BEIJING
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