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Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material

A technology of composite damping material and martensitic phase transformation, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of scarce equipment, complicated operation, expensive testing costs, etc., and achieve the effect of high accuracy and low cost

Inactive Publication Date: 2017-02-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is expensive to test, requires the use of high-energy X-ray sources, and the equipment is scarce and the operation is complicated.

Method used

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  • Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material
  • Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material
  • Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material

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Embodiment 1

[0034] The composition is Ni 50 Ti 50Take the dense shape memory alloy damping material as an example, that is, the alloy contains 50% Ni element and 50% Ti element at an atomic ratio. The scanning electron microscope photo of the sample is as follows figure 1 As shown, the surface is flat and consists of a single NiTi phase.

[0035] The method for determining the stress-induced martensitic transformation critical point of a shape memory alloy composite damping material comprises the following steps:

[0036] (1) The dense Ni was measured by differential thermal scanning thermal analysis method 50 Ti 50 The DSC curve of the shape memory alloy sample, such as figure 2 As shown, the heating or cooling rate used is 5°C / min, and the test temperature range is -60 to 200°C. First, the sample is heated to 200°C for 2 minutes, and then cooled to -60°C at a rate of 5°C / min. Obtain the cooling curve, i.e. figure 2 The curve in the middle and upper part, then stay for 2 minutes,...

Embodiment 2

[0041] The composition is Ni 46 Ti 54 Take the dense shape memory alloy composite damping material as an example, that is, the alloy contains 46% Ni element and 54% Ti element in atomic ratio, and the microstructure of the sample is composed of two phases, semi-network and granular Ti 2 Ni phase, distributed in the NiTi matrix phase, such as Figure 4 As shown, the dark phase is Ti 2 Ni phase, light color is NiTi phase.

[0042] The method for determining the stress-induced martensitic transformation critical point of a shape memory alloy composite damping material comprises the following steps:

[0043] (1) The DSC curve of the dense NiTi shape memory alloy sample is measured by differential thermal scanning thermal analysis method, such as Figure 5 As shown, the heating or cooling rate used is 10°C / min, and the test temperature range is -60 to 200°C. First, the sample is heated to 200°C for 2 minutes, and then cooled to -60°C at a rate of 10°C / min. Obtain the cooling c...

Embodiment 3

[0048] The composition is Ni 46 Ti 54 Take the porous shape memory alloy composite damping material as an example, that is, the alloy contains 46% Ni element and 54% Ti element in atomic ratio. The sample is a porous material with a porosity of 37% and a pore size of about 200 μm, as shown in Fig. It is porous Ni in this embodiment 46 Ti 54 The metallographic photograph of shape memory alloy composite damping material; Fig. 7 b is the present embodiment porous Ni 46 Ti 54 Scanning electron micrograph of shape memory alloy composite damping material; as shown in Figure 7a, its microstructure is composed of two phases, granular Ti 2 Ni phase, distributed in the NiTi matrix phase, as shown in Figure 7b, the dark phase is Ti 2 The Ni phase, the light color is the NiTi phase, indicating that there are many pore surfaces in the sample, and the interface between the second phase and the matrix is ​​increased, which all help to increase the damping performance of the memory alloy...

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Abstract

The invention discloses a method for determining a stress-induced martensitic transformation critical point of a shape memory alloy composite damping material. A reverse martensitic phase transformation finish temperature Af of a sample is determined through a differential thermal scanning thermal analysis method; the internal friction-strain spectrum of the sample is measured at the temperature higher than the reverse martensitic phase transformation finish temperature Af by means of a dynamic mechanical analyzer; finally, the critical point with the remarkably increasing inner friction in the internal friction-strain spectrum is analyzed through the tangent method, the critical point is the stress-induced martensitic transformation critical point of the shape memory alloy composite damping material, and corresponding strain is stress-induced martensitic transformation critical strain. The method is reliable, quick, high in precision and low in cost. Subtle structure changes of the shape memory alloy composite damping material can be visually reflected, and the transformation critical point is precisely measured. The method is applicable to compact shape memory alloy, porous shape memory alloy and shape memory alloy composite materials.

Description

technical field [0001] The invention relates to the field of shape memory alloy composite materials, in particular to a method for determining the stress-induced martensitic transformation critical point of dense and porous shape memory alloy composite materials. Background technique [0002] Noise, vibration, and impact damage are ubiquitous and inevitable in many fields, such as aerospace, military, transportation, construction, etc., which have brought many adverse effects to all walks of life, and even caused serious consequences. On the one hand, it affects the accuracy, life and reliability of the equipment, and in severe cases, it can cause loss of function of valuable equipment; on the other hand, it deteriorates the working environment and endangers people's health and life. At present, the industry in the field of noise vibration and impact damage prevention has developed rapidly. In recent decades, it has attracted more and more attention, and the market demand is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 袁斌杨兵高岩黎花朱敏
Owner SOUTH CHINA UNIV OF TECH
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