The influence of C/Ta ratio on TaC precipitates in Co-Re base alloys investigated by small-angle neutron scattering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00477404" target="_blank" >RIV/61389005:_____/17:00477404 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.actamat.2017.04.029" target="_blank" >http://dx.doi.org/10.1016/j.actamat.2017.04.029</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.actamat.2017.04.029" target="_blank" >10.1016/j.actamat.2017.04.029</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The influence of C/Ta ratio on TaC precipitates in Co-Re base alloys investigated by small-angle neutron scattering

Popis výsledku v původním jazyce

Co-Re alloys are being developed to supplement Ni-base superalloys in future gas turbines for ultra-high temperature applications. The finely distributed mono-carbide phase of TaC is an important strengthening phase in this alloy, and interacts with dislocations during high temperature creep deformation. This study aims to determine and to understand the volume fraction and size distribution of TaC precipitates in dependence of C/Ta stoichiometry and heat treatment by means of in-situ small-angle neutron scattering. At measuring temperatures of 1173 K, 1373 K and 1473 K, a stable population of fine TaC <100 nm size is formed during ageing for a wide range of C/Ta stoichiometry but with considerably different volume fraction and coarsening behavior. Important parameters for mechanical properties of the material, such as particle size distribution and inter-particle distance, were determined. It is shown that the phase transformation from gamma-matrix (fcc) <-> epsilon-matrix (hcp) of the Co-Re matrix has a considerable influence on the TaC precipitate formation.

Název v anglickém jazyce

The influence of C/Ta ratio on TaC precipitates in Co-Re base alloys investigated by small-angle neutron scattering

Popis výsledku anglicky

Co-Re alloys are being developed to supplement Ni-base superalloys in future gas turbines for ultra-high temperature applications. The finely distributed mono-carbide phase of TaC is an important strengthening phase in this alloy, and interacts with dislocations during high temperature creep deformation. This study aims to determine and to understand the volume fraction and size distribution of TaC precipitates in dependence of C/Ta stoichiometry and heat treatment by means of in-situ small-angle neutron scattering. At measuring temperatures of 1173 K, 1373 K and 1473 K, a stable population of fine TaC <100 nm size is formed during ageing for a wide range of C/Ta stoichiometry but with considerably different volume fraction and coarsening behavior. Important parameters for mechanical properties of the material, such as particle size distribution and inter-particle distance, were determined. It is shown that the phase transformation from gamma-matrix (fcc) <-> epsilon-matrix (hcp) of the Co-Re matrix has a considerable influence on the TaC precipitate formation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinární výzkumné centrum moderních materiálů</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

Acta Materialia

ISSN

1359-6454

e-ISSN

—

Svazek periodika

132

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

354-366

Kód UT WoS článku

000405881500032

EID výsledku v databázi Scopus

2-s2.0-85019196389