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Narrow temperature zone temperature control Ni-Ti shape memory alloy and preparation method and application thereof

A technology of memory alloy and temperature zone, which is applied in the field of narrow temperature zone temperature control Ni-Ti shape memory alloy and its preparation, can solve the problems of time-consuming, environmental pollution, affecting the application of shape memory effect, etc., and achieve the goal of shortening the time spent Effect

Active Publication Date: 2017-05-31
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional heat treatment method is to anneal the alloy for a long time (several hours or even tens of hours) to achieve the purpose, but this heat treatment method not only consumes a lot of time, but also consumes a lot of energy, causing greater environmental pollution
A large number of studies have shown that in Ni-Ti shape memory alloys, the memory phase NiTi 2 The precipitation of particles in the NiTi alloy matrix can cause the atomic ratio of Ni and Ti to change, which in turn affects the phase transition point of the Ni-Ti shape memory alloy to a large extent. When the Ni atom content in the matrix is ​​relatively high, the Ni-Ti shape memory alloy The phase transition point is even lower than 0°C, which will seriously affect the application of its shape memory effect in practical engineering

Method used

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  • Narrow temperature zone temperature control Ni-Ti shape memory alloy and preparation method and application thereof
  • Narrow temperature zone temperature control Ni-Ti shape memory alloy and preparation method and application thereof
  • Narrow temperature zone temperature control Ni-Ti shape memory alloy and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step (1): Composition design of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0038] The alloy composition is designed as Ti by mass percentage 44.73 Ni 55.27 , this composition can make the alloy meet the purpose of reducing the driving force of phase change and responding to phase change in a narrow temperature range.

[0039] Step (2): Preparation of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0040] The uniformly mixed Ni-Ti alloy powder is placed in an argon-protected planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank and ball materials are all stainless steel, and the diameters of the balls are 15, 10, and 6mm, respectively. , and their weight ratio is 1:3:1. The high-energy ball milling process parameters are as follows: the ball mill tank is filled with high-purity argon (99.999%, 0.5MPa) for protection, the ball-to-material ratio is 7:1, and the sp...

Embodiment 2

[0053] Step (1): Composition design of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0054] The alloy composition is designed as Ti by mass percentage 44.43 Ni 46.69 Cu 8.88 , Adding a small amount of Cu can make the alloy meet the purpose of reducing the driving force of phase change and responding to phase change in a narrow temperature range.

[0055] Step (2): Preparation of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0056] Select Ti, Ni and Cu elemental components with purity better than 99.7wt%, according to the mass percentage designed in step (1), adopt the vacuum suction casting method, through six times of repeated smelting, make the components homogeneous, and obtain a diameter of Φ6 ×50mm shape memory alloy rod.

[0057] Step (3): Pulse current heat treatment of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0058] Cut the shape memory alloy bar stock obtained in step (...

Embodiment 3

[0068] Step (1): Composition design of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0069] The alloy composition is designed as Ti by mass percentage 51 Ni 49 , this composition can make the alloy meet the purpose of reducing the driving force of phase change and responding to phase change in a narrow temperature range.

[0070] Step (2): Preparation of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0071] The metal blocks of pure Ni (99.7%) and pure Ti (99.9%) are smelted repeatedly until the composition is uniform, and then suction-cast to obtain a cylindrical shape memory alloy material.

[0072] Step (3): Pulse current heat treatment of Ni-Ti shape memory alloy with narrow temperature zone temperature control

[0073] Cut the bulk shape memory alloy sample obtained in step (2) into small cylinders of Φ6×12mm and put them into the mold, and perform low-temperature short-time annealing heat treatment by pulse cur...

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Abstract

The invention discloses a preparation method of narrow temperature zone temperature control Ni-Ti shape memory alloy. The method includes the following steps that (1) untreated Ni-Ti shape memory alloy is subjected to pulse current annealing heat treatment, the pulse current strength I is 900A-1300A, the annealing time t is 30-60min, and the annealing temperature T is 450-900 DEG C; and (2) liquid nitrogen quenching treatment is performed on the Ni-Ti shape memory alloy subjected to pulse current heat treatment, and accordingly the narrow temperature zone temperature control Ni-Ti shape memory alloy can be obtained. The invention further discloses the narrow temperature zone temperature control Ni-Ti shape memory alloy and an application thereof. By means of the narrow temperature zone temperature control Ni-Ti shape memory alloy and the preparation method and application thereof, precipitation of a Ni4Ti3 precipitated phase can be truly and effectively facilitated, the narrow temperature zone temperature control shape memory alloy is effectively prepared, heat treatment time is greatly shortened, and the effects of energy saving and environmental protection are achieved.

Description

technical field [0001] The invention relates to the field of Ni-Ti shape memory alloys, in particular to a Ni-Ti shape memory alloy with narrow temperature zone temperature control, a preparation method and an application thereof. Background technique [0002] Shape memory alloys refer to a class of alloys that have a certain initial shape after being plastically deformed at low temperature and fixed into another shape, and can be restored to the original shape by heating above the critical temperature of phase transformation. Shape memory alloy is a functional material integrating perception and actuation. At present, there are many successful examples of the application of shape memory alloys in the aerospace field. For example, artificial satellite antennas can be made of shape memory alloys. After orbiting, warming makes the folded shape memory satellite antenna unfold naturally and restore its parabolic shape; shape memory alloys also have a wide range of application p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C19/03C22C30/02C22F1/10C22F1/18
CPCC22C14/00C22C19/03C22C30/02C22F1/10C22F1/183
Inventor 杨超叶文兵丁言飞冯松展
Owner SOUTH CHINA UNIV OF TECH
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