Applying infrared thermography to analyse martensitic microstructures in a Cu–Al–Be shape-memory alloy subjected to a cyclic loading

Delpueyo, D.; Balandraud, Xavier; Grédiac, Michel

doi:10.1016/j.msea.2011.07.050

Cited by 25 publications

(17 citation statements)

References 28 publications

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“…In addition to temporally resolved measurement, spatial thermal images captured by IR cameras are an ideal noncontact tool to explore the distribution of temperature profiles subjected to external stimuli such as uniaxial stress. 144,147,148,150 In this case, the thermal response is correlated with structural degrees of freedom of materials, which can be very useful to study the microstructure dynamics such as nucleation. 144,148 Spatially resolved measurements have been conducted to study the local inhomogeneities of elastocaloric and magnetocaloric responses.…”

Section: Infra-red Cameramentioning

confidence: 99%

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Liu

Scott

Dkhil

2016

Applied Physics Reviews

236

150

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It has been ten years since the discovery of the giant electrocaloric effect in ferroelectric materials showed that it is possible to employ this effect for substantial cooling applications. This last decade has been marked by increasing research interest, especially in characterizing and measuring the electrocaloric effect using both the so-called indirect and direct approaches. In this context, a comprehensive summary and careful reexamination of these approaches are very timely and of great importance to justify the assumptions used in different measurement techniques. This review is therefore dedicated to cover recent important and rapid advances from both the indirect and direct measurements and provides critical insights relevant for quantifying the electrocaloric effect. It involves electrocaloric materials from normal ferroelectrics, antiferroelectrics, and relaxors, and it fundamentally focuses on how the electrocaloric entropy changes in response to electric field in these typical electrocalorics. The article addresses recent developments, especially during the past three years, such as technical selection of proper polarization-electric field loops, negative electrocaloric effect in antiferroelectrics and relaxors, the controversial debate on the indirect method in relaxors, the important role of field dependence of specific heat, kinetic factors, and so on. Moreover, this review also is concerned with extracting reliable data by direct measurements. Four typical techniques and devices used recently, such as thermocouples, differential scanning calorimeters, specifically designed calorimeters, and scanning thermal microscopy, are briefly reviewed, while infrared cameras are emphasized. We hope that our review will not only provide a useful background to understand fundamentally the electrocaloric effect and what one really measures but also may act as a practical guide to exploit and develop electrocalorics towards the design of suitable devices. Published by AIP Publishing. [http://dx

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Section: Infra-red Cameramentioning

confidence: 99%

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Liu

Scott

Dkhil

2016

Applied Physics Reviews

236

150

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“…This nondestructive technique was based on detecting the increase in the stress in the local phase transformation by measuring the rise in thermoelestic signals, using a highly sensitive infrared detector. D. Delpueyo et al [12] revealed the martensitic microstructure by infrared thermography (IRT). This technique is based on the analysis of temperature variations, measured by IRT, of the martensitic transformation during monotonic and cyclic loadings.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

Sarraj

Kessentini

Hassine

et al. 2019

Metals

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In this work, we are interested in examining the strain rate effect on the mechanical behavior of Ni–Ti superelastic wires after hydrogen charging and ageing for 24 h. Specimens underwent 50 cycles of loading-unloading, reaching an imposed deformation of 7.6%. During loading, strain rates from 10−4 s−1 to 10−2 s−1 were achieved. With a strain rate of 10−2 s−1, the specimens were charged by hydrogen for 6 h and aged for one day showed a superelastic behavior marked by an increase in the residual deformation as a function of the number of cycles. In contrast, after a few number of cycles with a strain rate of 10−4 s−1, the Ni-Ti alloy archwire specimens fractured in a brittle manner during the martensite transformation stage. The thermal desorption analysis showed that, for immersed specimens, the desorption peak of hydrogen appeared at 320 °C. However, after annealing the charged specimens by hydrogen at 400 °C for 1 h, an embrittlement took place at the last cycles for the lower strain rates of 10−4 s−1. The present study suggests that the embrittlement can be due to the development of an internal stress in the subsurface of the parent phase during hydrogen charging and due to the creation of cracks and local zones of plasticity after desorption.

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“…In a number of papers [1][2][3][4] the studies of evolved heat variation relative to plastic deformation energy was subjected. Dissipated energy in shape-memory alloys Cu-Zn-Al, Ni-Ti, Cu-Al-Be, Ti-4.2Al-1.6Mn was studied under cyclic loading [5][6][7][8]. The investigations of materials deforming with serrated flow appearance accompanied by the nucleation of Portevin-Le Chatelier bands are subjected in several works [6,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The variation of storage and heat energy in AISI 304 under plastic deformation

Lunev

Nadezhkin

2019

THERM SCI

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The results of the analysis of heat and stored energy variation in stainless steel AISI 304 under tension are presented in this work. The distributions of temperature and strain on the surface of specimens have been obtained by using infrared thermography and the digital image correlation of laser speckle patterns techniques. It has been found that the plastic flow diagram consists of two linear stages. The first one is characterized by the monotonic growth in evolved heat. At the second linear stage the portion of stored energy rises, that is connected with the growth in the rate of martensitic transformations. A temperature fluctuation in the center of a specimen at the true strain over 0.4 appears due to the motion of localized strain bands, which are also the sources of heat.

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Applying infrared thermography to analyse martensitic microstructures in a Cu–Al–Be shape-memory alloy subjected to a cyclic loading

Cited by 25 publications

References 28 publications

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Direct and indirect measurements on electrocaloric effect: Recent developments and perspectives

Hydrogen Effect on the Cyclic Behavior of a Superelastic NiTi Archwire

The variation of storage and heat energy in AISI 304 under plastic deformation

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