Elastic Constants of Single-Crystalline NiTi Studied by Resonant Ultrasound Spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F25%3A00642536" target="_blank" >RIV/61388998:_____/25:00642536 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/25:00642536

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s40830-025-00534-z" target="_blank" >https://link.springer.com/article/10.1007/s40830-025-00534-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s40830-025-00534-z" target="_blank" >10.1007/s40830-025-00534-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Elastic Constants of Single-Crystalline NiTi Studied by Resonant Ultrasound Spectroscopy

Popis výsledku v původním jazyce

Contactless, laser-based resonant ultrasound spectroscopy was utilized to monitor changes in elastic properties in single-crystalline NiTi shape memory alloy. It was observed that the elastic behavior of the temperature-induced B19 ' martensite, which is formed by a fine mixture of variants, adopts the symmetry elements of the parent austenite phase and thus, the changes over the transformation temperature can be represented by the temperature evolution of three cubic elastic coefficients. The experiments confirm that the transition during the cooling run is preceded by pronounced softening of the c(44) elastic coefficient, which leads to nearly complete vanishing of elastic anisotropy prior to the transition. Below the transition, this coefficient remains soft, and the character of anisotropy switches from c(44)/c ' > 1 to c(44)/c ' < 1. We rationalize this behavior from the mechanical instability of the B19 ' lattice with respect to shears along the (001)B19 ' plane, which is known from first-principles calculations.

Název v anglickém jazyce

Elastic Constants of Single-Crystalline NiTi Studied by Resonant Ultrasound Spectroscopy

Popis výsledku anglicky

Contactless, laser-based resonant ultrasound spectroscopy was utilized to monitor changes in elastic properties in single-crystalline NiTi shape memory alloy. It was observed that the elastic behavior of the temperature-induced B19 ' martensite, which is formed by a fine mixture of variants, adopts the symmetry elements of the parent austenite phase and thus, the changes over the transformation temperature can be represented by the temperature evolution of three cubic elastic coefficients. The experiments confirm that the transition during the cooling run is preceded by pronounced softening of the c(44) elastic coefficient, which leads to nearly complete vanishing of elastic anisotropy prior to the transition. Below the transition, this coefficient remains soft, and the character of anisotropy switches from c(44)/c ' > 1 to c(44)/c ' < 1. We rationalize this behavior from the mechanical instability of the B19 ' lattice with respect to shears along the (001)B19 ' plane, which is known from first-principles calculations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Shape Memory and Superelasticity

ISSN

2199-384X

e-ISSN

2199-3858

Svazek periodika

11

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

230-238

Kód UT WoS článku

001455757200001

EID výsledku v databázi Scopus

2-s2.0-105001484252