Frequency-dependent fatigue damage in polycrystalline copper analyzed by FIB tomography

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00541831" target="_blank" >RIV/68081723:_____/21:00541831 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S1359645421002391?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1359645421002391?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.actamat.2021.116859" target="_blank" >10.1016/j.actamat.2021.116859</a>

Result language

angličtina

Original language name

Frequency-dependent fatigue damage in polycrystalline copper analyzed by FIB tomography

Original language description

Pure polycrystalline copper has been subjected to cyclic loading with frequencies from 4 Hz to 20 kHz. With increasing frequency, the S-N curve was shifted to a higher number of cycles to fracture. Quasi-static and dynamic tensile tests were performed to identify the strain rate sensitivity corresponding to the increase of the cyclic frequency in order to explain the shift of the S-N curve with the frequency.nnSurface relief evolution has been studied in specimens cycled with various stress amplitudes and frequencies. Scanning electron microscopy inspection of the surface and the perpendicular cuts produced by focused ion beam sectioning allowed characterizing the surface relief and internal structure of the individual specimens subjected to cycling. Characteristic types of slip bands were found. In all cases, cavities formed in or around the primary slip plane below the slip markings. Focused ion beam slicing and image recording with subsequent 3D reconstruction allowed obtaining the distribution of cavities below the slip markings. A close relation was established between the distribution of cavities and resulting surface relief. Formation of cavities in the slip band led to the development of extrusions and in some cases also to tiny intrusions. Both rough surface relief and the cavity distribution below the surface along the slip plane contributed to the initiation of the fatigue cracks. Localized cyclic straining with a high strain rate has been analyzed in terms of vacancy generation within the slip band leading to cavity formation.

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

Acta Materialia

ISSN

1359-6454

e-ISSN

1873-2453

Volume of the periodical

211

Issue of the periodical within the volume

JUN

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

116859

UT code for WoS article

000670355900004

EID of the result in the Scopus database

2-s2.0-85104092205