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Method for imparting two-way memory properties to ni-rich tini shape memory alloys

A memory alloy and memory technology, which is applied in the field of endowment of Ni-rich TiNi shape memory alloys with two-way memory characteristics, can solve problems such as difficulty in achieving memory performance, and achieve strong cyclic deformation stability, shortened cycle time, and cyclic fatigue life. long effect

Active Publication Date: 2020-08-11
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

At present, it is difficult to achieve the two-way shape memory performance of "thermal expansion and cold contraction" using traditional thermal-mechanical cycle training methods

Method used

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  • Method for imparting two-way memory properties to ni-rich tini shape memory alloys
  • Method for imparting two-way memory properties to ni-rich tini shape memory alloys

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Embodiment Construction

[0024] The technical scheme of the present invention will be described in further detail below in conjunction with accompanying drawing and embodiment:

[0025] see Figure 1~2 As shown, the method for imparting the two-way memory property of this Ni-rich state TiNi shape memory alloy is characterized in that: the two-way memory property refers to the "thermal expansion and contraction" type two-way shape memory property, and the steps of the endowment method yes:

[0026] (1) The chemical composition and atomic percentage in the Ni-rich state TiNi shape memory alloy are: Ni50.8~60.0%, and the balance is Ti, and the mass percent of impurities C and O in the Ni-rich state TiNi shape memory alloy should be Less than 0.3%;

[0027] (2) The Ni-rich state TiNi shape memory alloy adopts a pipe 1 as the training object, the wall thickness of the pipe 1 is 0.3-50mm, the outer diameter is 5-350mm, and the length is 10-300mm;

[0028] (3) Aging treatment of the TiNi shape memory allo...

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Abstract

The invention discloses a method for endowing a Ni-enriched TiNi shape memory alloy with a two-way shape memory characteristic. The method comprises the following steps: applying high-energy electrical stimulation to a constrained cold-formed TiNi shape memory alloy, coupling a Joule heating effect caused in a low temperature range of 150-250 DEG C with the electron wind effect, promoting the internal defects (such as dislocation) of the alloy to be in directional arrangement along a constraint stress direction, enabling a martensite variant to be in orientated growth, then 'memorizing' the cold forming state as a high temperature shape, 'memorizing' a high-temperature aging state as a low temperature shape, matching a mechanical training method to form the electrical stimulation-mechanical training method, and endowing the Ni-enriched TiNi shape memory alloy with the 'thermal expansion and cold contraction' type two-way shape memory characteristic. According to the method, the high-energy electrical stimulation and martensitic phase transition alternative cycle period duration can be greatly shortened, the production efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention is a method for imparting two-way memory characteristics of a Ni-rich state TiNi shape memory alloy, which belongs to Background technique: [0002] Shape memory alloy is a material with integrated structure and function, and has the dual functions of sensing and driving at the same time. It is the best choice for realizing lightweight and intelligent mechanical structures. TiNi-based shape memory alloys have martensitic phase transformation characteristics, so they have excellent shape memory properties, superelastic properties and high damping properties; in addition, TiNi-based shape memory alloys are intermetallic compounds with good mechanical properties and corrosion resistance , has the most application prospect as a solid-state drive. The one-way shape memory and superelastic properties of TiNi-based shape memory alloys belong to the intrinsic properties of alloy materials, while the two-way shape memory properties do not belong ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22F1/10
CPCC22C19/03C22F1/002C22F1/006C22F1/10
Inventor 官磊成波刘大博
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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