Duality in dislocation density-superelasticity correlation in a TNTZ bio alloy processed by cold rolling and subsequent annealing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00341676" target="_blank" >RIV/68407700:21220/20:00341676 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.msea.2020.139181" target="_blank" >https://doi.org/10.1016/j.msea.2020.139181</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2020.139181" target="_blank" >10.1016/j.msea.2020.139181</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Duality in dislocation density-superelasticity correlation in a TNTZ bio alloy processed by cold rolling and subsequent annealing

Popis výsledku v původním jazyce

The effect of restoration mechanisms on the superelastic behavior of a Ti-Nb-Ta-Zr (TNTZ) bio-alloy was investigated in terms of dislocation density-superelasticity correlation. For this purpose, the cold-rolled material (by 70% reduction) was subjected to various annealing temperatures ranging from 500 to 900 degrees C (30 min) to obtain microstructures with different restoration conditions. The characterization of microstructures was mainly performed by SEM/EBSD, OM, and TEM analysis, although X-ray analysis was also employed to calculate the dislocation densities of the obtained microstructures. The superelasticity of specimens was evaluated by loading-unloading tensile tests. A dual correlation between dislocation density and pseudoelastic (S) ratio was observed in the studying microstructures. A very low superelasticity was observed in dislocation dense structures of cold-rolled and 500 degrees C annealed specimens. The S value significantly increased in the 600 degrees C annealed specimen (S = 49%) as dislocation density decreased in the structure. However, further reduction of dislocation density degraded the superelasticity in the specimens annealed at the higher temperature range of 700-900 degrees C. This nonlinearity behavior was explained by the dissimilar effect of microstructure dislocation density on the direct and reverse transformation of martensite.

Název v anglickém jazyce

Duality in dislocation density-superelasticity correlation in a TNTZ bio alloy processed by cold rolling and subsequent annealing

Popis výsledku anglicky

The effect of restoration mechanisms on the superelastic behavior of a Ti-Nb-Ta-Zr (TNTZ) bio-alloy was investigated in terms of dislocation density-superelasticity correlation. For this purpose, the cold-rolled material (by 70% reduction) was subjected to various annealing temperatures ranging from 500 to 900 degrees C (30 min) to obtain microstructures with different restoration conditions. The characterization of microstructures was mainly performed by SEM/EBSD, OM, and TEM analysis, although X-ray analysis was also employed to calculate the dislocation densities of the obtained microstructures. The superelasticity of specimens was evaluated by loading-unloading tensile tests. A dual correlation between dislocation density and pseudoelastic (S) ratio was observed in the studying microstructures. A very low superelasticity was observed in dislocation dense structures of cold-rolled and 500 degrees C annealed specimens. The S value significantly increased in the 600 degrees C annealed specimen (S = 49%) as dislocation density decreased in the structure. However, further reduction of dislocation density degraded the superelasticity in the specimens annealed at the higher temperature range of 700-900 degrees C. This nonlinearity behavior was explained by the dissimilar effect of microstructure dislocation density on the direct and reverse transformation of martensite.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering A - Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Svazek periodika

782

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000525797900016

EID výsledku v databázi Scopus

2-s2.0-85082129900