How Nanoscale Dislocation Reactions Govern Low- Temperature and High-Stress Creep of Ni-Base Single Crystal Superalloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00534080" target="_blank" >RIV/68081723:_____/20:00534080 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2073-4352/10/2/134" target="_blank" >https://www.mdpi.com/2073-4352/10/2/134</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/cryst10020134" target="_blank" >10.3390/cryst10020134</a>

Result language

angličtina

Original language name

How Nanoscale Dislocation Reactions Govern Low- Temperature and High-Stress Creep of Ni-Base Single Crystal Superalloys

Original language description

The present work investigates gamma-channel dislocation reactions, which govern low-temperature (T = 750 degrees C) and high-stress (resolved shear stress: 300 MPa) creep of Ni-base single crystal superalloys (SX). It is well known that two dislocation families with different b-vectors are required to form planar faults, which can shear the ordered gamma'-phase. However, so far, no direct mechanical and microstructural evidence has been presented which clearly proves the importance of these reactions. In the mechanical part of the present work, we perform shear creep tests and we compare the deformation behavior of two macroscopic crystallographic shear systems [011 over bar ](111) and [112 over bar ](111). These two shear systems share the same glide plane but differ in loading direction. The [112 over bar ](111) shear system, where the two dislocation families required to form a planar fault ribbon experience the same resolved shear stresses, deforms significantly faster than the [011 over bar ](111) shear system, where only one of the two required dislocation families is strongly promoted. Diffraction contrast transmission electron microscopy (TEM) analysis identifies the dislocation reactions, which rationalize this macroscopic behavior.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Crystals

ISSN

2073-4352

e-ISSN

—

Volume of the periodical

10

Issue of the periodical within the volume

2

Country of publishing house

CH - SWITZERLAND

Number of pages

15

Pages from-to

134

UT code for WoS article

000519704700002

EID of the result in the Scopus database

2-s2.0-85081281283