On the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00534084" target="_blank" >RIV/68081723:_____/20:00534084 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0921509320310339?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509320310339?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2020.139961" target="_blank" >10.1016/j.msea.2020.139961</a>

Result language

angličtina

Original language name

On the stress and temperature dependence of low temperature and high stress shear creep in Ni-base single crystal superalloys

Original language description

In the present work, we investigate the stress and temperature dependence of low-temperature (750 + 20 degrees C) and high-stress (300 + 20 MPa) shear creep of a Ni-base single crystal superalloy. From continuous isothermal experiments and stress and temperature change tests the stress exponent n and the apparent activation energy Q(app) of the phenomenological Sherby-Dorn equation were determined for the two macroscopic crystallographic shear systems (MCSS) [01 (1) over bar](111) and [11 (2) over bar] (111). The activation parameters of creep, the stress exponents and the apparent activation energies were identified as 16 and 620 kJ/mol (MCSS: [01 (1) over bar](111)) and 14 and 460 kJ/mol (MCSS: [11 (2) over bar] (111)). We show that during shear creep testing these phenomenological parameters do not change between the early (0.5-1% strain) and later stages of creep (4.5-5% strain), in contrast to what was observed for uniaxial tensile testing. The results are discussed in the light of what is known about stress and temperature dependencies of deformation rates in the creep literature and in view of the recent work by Burger et al., 2020, who combined shear creep testing with analytical transmission electron microscopy to identify the elementary deformation mechanism, which governs low temperature and high stress creep.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/EF16_025%2F0007304" target="_blank" >EF16_025/0007304: Architectured materials designed for additive manufacturing</a><br>

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

Materials Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Volume of the periodical

795

Issue of the periodical within the volume

SEP

Country of publishing house

CH - SWITZERLAND

Number of pages

10

Pages from-to

139961

UT code for WoS article

000573282500001

EID of the result in the Scopus database

2-s2.0-85088875133