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  4. Thermostat Influence on the Structural Development and Material Removal during Abrasion of Nanocrystalline Ferrite
 
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Thermostat Influence on the Structural Development and Material Removal during Abrasion of Nanocrystalline Ferrite

Publikationstyp
Journal Article
Date Issued
2017-04-03
Sprache
English
Author(s)
Eder, Stefan J.  
Cihak-Bayr, Ulrike  
Bianchi, Davide  
Feldbauer, Gregor  orcid-logo
Betz, Gerhard  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-URI
http://hdl.handle.net/11420/4370
Journal
ACS applied materials & interfaces  
Volume
9
Issue
15
Start Page
13713
End Page
13725
Citation
ACS Applied Materials & Interfaces 9 (15), 13713-13725 ( 2017)
Publisher DOI
10.1021/acsami.7b01237
Scopus ID
2-s2.0-85017715276
ArXiv ID
1704.04384v1
Publisher
American Chemical Society
We consider a nanomachining process of hard, abrasive particles grinding on the rough surface of a polycrystalline ferritic work piece. Using extensive large-scale molecular dynamics (MD) simulations, we show that the mode of thermostatting, i.e., the way that the heat generated through deformation and friction is removed from the system, has crucial impact on tribological and materials related phenomena. By adopting an electron-phonon coupling approach to parametrize the thermostat of the system, thus including the electronic contribution to the thermal conductivity of iron, we can reproduce the experimentally measured values that yield realistic temperature gradients in the work piece. We compare these results to those obtained by assuming the two extreme cases of only phononic heat conduction and instantaneous removal of the heat generated in the machining interface. Our discussion of the differences between these three cases reveals that although the average shear stress is virtually temperature independent up to a normal pressure of approximately 1 GPa, the grain and chip morphology as well as most relevant quantities depend heavily on the mode of thermostatting beyond a normal pressure of 0.4 GPa. These pronounced differences can be explained by the thermally activated processes that guide the reaction of the Fe lattice to the external mechanical and thermal loads caused by nanomachining.
Subjects
abrasive wear
electron-phonon coupling
heat conductivity
molecular dynamics
nanomachining
polycrystal
thermostat
DDC Class
530: Physik
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