Thermal conductivity and specific heat capacity of austenite and stress‑induced martensite in superelastic NiTi at ambient temperature

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00577408" target="_blank" >RIV/68378271:_____/23:00577408 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s10765-023-03279-y" target="_blank" >https://doi.org/10.1007/s10765-023-03279-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10765-023-03279-y" target="_blank" >10.1007/s10765-023-03279-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal conductivity and specific heat capacity of austenite and stress‑induced martensite in superelastic NiTi at ambient temperature

Popis výsledku v původním jazyce

Infrared thermography (IRT) and heat source reconstruction (HSR) were used in the study to measure two thermophysical properties of superelastic nickel-titanium (NiTi) shape memory alloy (SMA) wires, namely thermal conductivity and specific heat capacity. A uniaxial testing machine was used to apply constant deformation while allowing temperature measurements by IRT during Joule heating and natural return the thermal equilibrium. The data processing by HSR, including preliminary filtering operations, was preliminarily evaluated from temperatures provided by a model (with added noise). It gave an error of ± 0.5% for the thermal conductivity and ± 1% for the specific heat capacity. The experimental analysis showed that the thermal conductivity of stress-induced martensite is 26% higher than that of austenite at the same temperature (here the ambient temperature). Regarding the specific heat capacity, that of stress-induced martensite is 4.7% lower than that of austenite.

Název v anglickém jazyce

Thermal conductivity and specific heat capacity of austenite and stress‑induced martensite in superelastic NiTi at ambient temperature

Popis výsledku anglicky

Infrared thermography (IRT) and heat source reconstruction (HSR) were used in the study to measure two thermophysical properties of superelastic nickel-titanium (NiTi) shape memory alloy (SMA) wires, namely thermal conductivity and specific heat capacity. A uniaxial testing machine was used to apply constant deformation while allowing temperature measurements by IRT during Joule heating and natural return the thermal equilibrium. The data processing by HSR, including preliminary filtering operations, was preliminarily evaluated from temperatures provided by a model (with added noise). It gave an error of ± 0.5% for the thermal conductivity and ± 1% for the specific heat capacity. The experimental analysis showed that the thermal conductivity of stress-induced martensite is 26% higher than that of austenite at the same temperature (here the ambient temperature). Regarding the specific heat capacity, that of stress-induced martensite is 4.7% lower than that of austenite.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA22-15763S" target="_blank" >GA22-15763S: Problémy deformační kompatibility mechanicky řízených martensitických transformací v polykrystalech slitin s tvarovou pamětí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Thermophysics

ISSN

0195-928X

e-ISSN

1572-9567

Svazek periodika

44

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

27

Strana od-do

162

Kód UT WoS článku

001087165000001

EID výsledku v databázi Scopus

2-s2.0-85174863757