TEM phase analysis of NiTi shape memory alloy prepared by self-propagating high-temperature synthesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F17%3A00337250" target="_blank" >RIV/68407700:21340/17:00337250 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/17:00470162 RIV/61389005:_____/17:00470162

Výsledek na webu

<a href="https://doi.org/10.1080/2374068X.2016.1247338" target="_blank" >https://doi.org/10.1080/2374068X.2016.1247338</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/2374068X.2016.1247338" target="_blank" >10.1080/2374068X.2016.1247338</a>

Jazyk výsledku

angličtina

Název v původním jazyce

TEM phase analysis of NiTi shape memory alloy prepared by self-propagating high-temperature synthesis

Popis výsledku v původním jazyce

The effect of annealing a Ni–48at.%Ti alloy prepared by selfpropagation high-temperature synthesis (SHS) by means of transmission electron microscopy (TEM) was studied. The alloy in the as-sintered condition shows the presence of B2 NiTi matrix, relatively large particles (2–100 μm) of cubic NiTi2 phase and very fine densely distributed particles of rhombohedral Ni4Ti3 phase. The phase fractions were determined by the Rietveld refinement of neutron diffraction. Twelve-hour annealing at 1000 °C leads to coarsening of Ni4Ti3 particles. Slow furnace cooling from the annealing temperature results in a transformation of the rhombohedral Ni4Ti3 phase to a metastable Ni3Ti2 phase with cubic symmetry. Its particles, coherent with the B2 matrix, have the form of thin oval platelets with lenticular cross-section. The orientation relation is either cube-to-cube or [115]B2 || [111]P and (552)B2 || (121)P. An additional isothermal annealing of the water cooled samples at 720 °C for 3 and 10 h was carried out. According to the scanning and transmission electron microscopy observation of the sample annealed for 3 h, the cubic Ni3Ti2 phase transforms to the high-temperature tetragonal Ni3Ti2–H variant (space group I4/mmm).

Název v anglickém jazyce

TEM phase analysis of NiTi shape memory alloy prepared by self-propagating high-temperature synthesis

Popis výsledku anglicky

The effect of annealing a Ni–48at.%Ti alloy prepared by selfpropagation high-temperature synthesis (SHS) by means of transmission electron microscopy (TEM) was studied. The alloy in the as-sintered condition shows the presence of B2 NiTi matrix, relatively large particles (2–100 μm) of cubic NiTi2 phase and very fine densely distributed particles of rhombohedral Ni4Ti3 phase. The phase fractions were determined by the Rietveld refinement of neutron diffraction. Twelve-hour annealing at 1000 °C leads to coarsening of Ni4Ti3 particles. Slow furnace cooling from the annealing temperature results in a transformation of the rhombohedral Ni4Ti3 phase to a metastable Ni3Ti2 phase with cubic symmetry. Its particles, coherent with the B2 matrix, have the form of thin oval platelets with lenticular cross-section. The orientation relation is either cube-to-cube or [115]B2 || [111]P and (552)B2 || (121)P. An additional isothermal annealing of the water cooled samples at 720 °C for 3 and 10 h was carried out. According to the scanning and transmission electron microscopy observation of the sample annealed for 3 h, the cubic Ni3Ti2 phase transforms to the high-temperature tetragonal Ni3Ti2–H variant (space group I4/mmm).

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA14-03044S" target="_blank" >GA14-03044S: Příprava slitin NiTi s tvarovou pamětí reaktivní sintrací</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Advances in Materials and Processing Technologies

ISSN

2374-068X

e-ISSN

2374-0698

Svazek periodika

3

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

58-69

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85058939874