Matrix Transformation in Boron Containing High-Temperature Co-Re-Cr Alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10391755" target="_blank" >RIV/00216208:11320/18:10391755 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/18:00492099

Výsledek na webu

<a href="https://doi.org/10.1007/s12540-018-0121-8" target="_blank" >https://doi.org/10.1007/s12540-018-0121-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12540-018-0121-8" target="_blank" >10.1007/s12540-018-0121-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Matrix Transformation in Boron Containing High-Temperature Co-Re-Cr Alloys

Popis výsledku v původním jazyce

An addition of boron largely increases the ductility in polycrystalline high-temperature Co-Re alloys. Therefore, the effect of boron on the alloy structural characteristics is of high importance for the stability of the matrix at operational temperatures. Volume fractions of epsilon (hexagonal close-packed-hcp), gamma (face-centered cubic-fcc) and sigma (Cr2Re3 type) phases were measured at ambient and high temperatures (up to 1500 A degrees C) for a boron-containing Co-17Re-23Cr alloy using neutron diffraction. The matrix phase undergoes an allotropic transformation from epsilon to gamma structure at high temperatures, similar to pure cobalt and to the previously investigated, more complex Co-17Re-23Cr-1.2Ta-2.6C alloy. It was determined in this study that the transformation temperature depends on the boron content (0-1000 wt. ppm). Nevertheless, the transformation temperature did not change monotonically with the increase in the boron content but reached a minimum at approximately 200 ppm of boron. A probable reason is the interplay between the amount of boron in the matrix and the amount of sigma phase, which binds hcp-stabilizing elements (Cr and Re). Moreover, borides were identified in alloys with high boron content.

Název v anglickém jazyce

Matrix Transformation in Boron Containing High-Temperature Co-Re-Cr Alloys

Popis výsledku anglicky

An addition of boron largely increases the ductility in polycrystalline high-temperature Co-Re alloys. Therefore, the effect of boron on the alloy structural characteristics is of high importance for the stability of the matrix at operational temperatures. Volume fractions of epsilon (hexagonal close-packed-hcp), gamma (face-centered cubic-fcc) and sigma (Cr2Re3 type) phases were measured at ambient and high temperatures (up to 1500 A degrees C) for a boron-containing Co-17Re-23Cr alloy using neutron diffraction. The matrix phase undergoes an allotropic transformation from epsilon to gamma structure at high temperatures, similar to pure cobalt and to the previously investigated, more complex Co-17Re-23Cr-1.2Ta-2.6C alloy. It was determined in this study that the transformation temperature depends on the boron content (0-1000 wt. ppm). Nevertheless, the transformation temperature did not change monotonically with the increase in the boron content but reached a minimum at approximately 200 ppm of boron. A probable reason is the interplay between the amount of boron in the matrix and the amount of sigma phase, which binds hcp-stabilizing elements (Cr and Re). Moreover, borides were identified in alloys with high boron content.

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

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

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Metals and Materials International

ISSN

1598-9623

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

KR - Korejská republika

Počet stran výsledku

11

Strana od-do

934-944

Kód UT WoS článku

000440153100003

EID výsledku v databázi Scopus

2-s2.0-85044615709