Grain Structure Engineering of NiTi Shape Memory Alloys by Intensive Plastic Deformation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F23%3A10253845" target="_blank" >RIV/61989100:27360/23:10253845 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26210/22:PU145147

Výsledek na webu

<a href="https://pubs.acs.org/doi/epdf/10.1021/acsami.2c05939" target="_blank" >https://pubs.acs.org/doi/epdf/10.1021/acsami.2c05939</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsami.2c05939" target="_blank" >10.1021/acsami.2c05939</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Grain Structure Engineering of NiTi Shape Memory Alloys by Intensive Plastic Deformation

Popis výsledku v původním jazyce

To explore an effective route of customizing the superelasticity (SE) of NiTi shape memory alloys via modifying the grain structure, binary Ni55Ti45 (wt) alloys were fabricated in as-cast, hot swaged, and hot-rolled conditions, presenting contrasting grain sizes and grain boundary types. In situ synchrotron X-ray Laue microdiffraction and in situ synchrotron X-ray powder diffraction techniques were employed to unravel the underlying grain structure mechanisms that cause the diversity of SE performance among the three materials. The evolution of lattice rotation, strain field, and phase transformation has been revealed at the micro-and mesoscale, and the effect of grain structure on SE performance has been quantified. It was found that (i) the Ni4Ti3 and NiTi2 precipitates are similar among the three materials in terms of morphology, size, and orientation distribution; (ii) phase transformation happens preferentially near high-angle grain boundary (HAGB) yet randomly in low-angle grain boundary (LAGB) structures; (iii) the smaller the grain size, the higher the phase transformation nucleation kinetics, and the lower the propagation kinetics; (iv) stress concentration happens near HAGBs, while no obvious stress concentration can be observed in the LAGB grain structure during loading; (v) the statistical distribution of strain in the three materials becomes asymmetric during loading; (vi) three grain lattice rotation modes are identified and termed for the first time, namely, multi-extension rotation, rigid rotation, and nondispersive rotation; and (vii) the texture evolution of B2 austenite and B19 &apos; martensite is not strongly dependent on the grain structure.

Název v anglickém jazyce

Grain Structure Engineering of NiTi Shape Memory Alloys by Intensive Plastic Deformation

Popis výsledku anglicky

To explore an effective route of customizing the superelasticity (SE) of NiTi shape memory alloys via modifying the grain structure, binary Ni55Ti45 (wt) alloys were fabricated in as-cast, hot swaged, and hot-rolled conditions, presenting contrasting grain sizes and grain boundary types. In situ synchrotron X-ray Laue microdiffraction and in situ synchrotron X-ray powder diffraction techniques were employed to unravel the underlying grain structure mechanisms that cause the diversity of SE performance among the three materials. The evolution of lattice rotation, strain field, and phase transformation has been revealed at the micro-and mesoscale, and the effect of grain structure on SE performance has been quantified. It was found that (i) the Ni4Ti3 and NiTi2 precipitates are similar among the three materials in terms of morphology, size, and orientation distribution; (ii) phase transformation happens preferentially near high-angle grain boundary (HAGB) yet randomly in low-angle grain boundary (LAGB) structures; (iii) the smaller the grain size, the higher the phase transformation nucleation kinetics, and the lower the propagation kinetics; (iv) stress concentration happens near HAGBs, while no obvious stress concentration can be observed in the LAGB grain structure during loading; (v) the statistical distribution of strain in the three materials becomes asymmetric during loading; (vi) three grain lattice rotation modes are identified and termed for the first time, namely, multi-extension rotation, rigid rotation, and nondispersive rotation; and (vii) the texture evolution of B2 austenite and B19 &apos; martensite is not strongly dependent on the grain structure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/GA19-15479S" target="_blank" >GA19-15479S: Zbytková napětí a mikrostruktura v kovových kompozitech modifikovaných extrémní plastickou deformací</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

ACS applied materials &amp; interfaces

ISSN

1944-8244

e-ISSN

1944-8252

Svazek periodika

14

Číslo periodika v rámci svazku

27

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

"31396–31410"

Kód UT WoS článku

000821932300001

EID výsledku v databázi Scopus

2-s2.0-85134426991