Creep and microstructure in directionally solidified NiAl(Cr)-Mo alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F15%3A00450284" target="_blank" >RIV/68081723:_____/15:00450284 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Creep and microstructure in directionally solidified NiAl(Cr)-Mo alloys

Popis výsledku v původním jazyce

We present NiAl(Cr)-Mo directionally solidified alloys exhibiting high temperature strength due to regularly distributed fine eutectic phases Mo or Cr. These eutectics exhibited minimum creep rates that were up to seven orders of magnitude lower than thecorresponding minimum creep rates of the NiAl matrix alloy and pure Mo or Cr single phases. We present detailed analysis of dislocation structures observed in the as-grown crystals as well as in the eutectics after creep. Clear evidence is provided showing that Mo and Cr phases contain essentially no dislocations before creep and the appropriate dislocation densities after creep. These results suggest that the immense hightemperature strength of the NiAl(Cr)-Mo eutectics can be attributed to the load bearing capacity of dislocation-free nano-reinforcements. These phases support the load transferred from the plastically deforming NiAl matrix up to the point when they yield. A statistically relevant yielding of the reinforcement is refle

Název v anglickém jazyce

Creep and microstructure in directionally solidified NiAl(Cr)-Mo alloys

Popis výsledku anglicky

We present NiAl(Cr)-Mo directionally solidified alloys exhibiting high temperature strength due to regularly distributed fine eutectic phases Mo or Cr. These eutectics exhibited minimum creep rates that were up to seven orders of magnitude lower than thecorresponding minimum creep rates of the NiAl matrix alloy and pure Mo or Cr single phases. We present detailed analysis of dislocation structures observed in the as-grown crystals as well as in the eutectics after creep. Clear evidence is provided showing that Mo and Cr phases contain essentially no dislocations before creep and the appropriate dislocation densities after creep. These results suggest that the immense hightemperature strength of the NiAl(Cr)-Mo eutectics can be attributed to the load bearing capacity of dislocation-free nano-reinforcements. These phases support the load transferred from the plastically deforming NiAl matrix up to the point when they yield. A statistically relevant yielding of the reinforcement is refle

Druh

O - Ostatní výsledky

CEP obor

JI - Kompositní materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/GA202%2F09%2F2073" target="_blank" >GA202/09/2073: Deformační mechanismy in-situ kompozitních materiálů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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