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OHNIŠŤOVÁ, P. PÍŠKA, M. PETRENEC, M. DLUHOŠ, J. HORNÍKOVÁ, J. ŠANDERA, P.
Original Title
Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining
Type
journal article in Web of Science
Language
English
Original Abstract
The fatigue properties of thermo-mechanically treated and machined aluminum alloy 7475-T7351 have been studied. The applied advanced machining strategy induced intensive plastic deformation on the machined surface under defined cutting conditions. Therefore, a detailed study of 3D surface topography was performed. Advanced characterization of the material structure and electron back scattered diffraction mapping of selected chemical phases were performed, as well as energy dispersive X-ray analysis of the surface. Advanced mechanical properties of the material were investigated in situ with a scanning electron microscope that was equipped with a unique tensile fixture. The fatigue results confirmed an evident dispersion of the data, but the mechanism of crack nucleation was established. Fracture surface analysis showed that the cracks nucleated at the brittle secondary particles dispersed in the material matrix. The surface topography of samples that had been machined in wide range of cutting/deformation conditions by milling has not proved to be a decisive factor in terms of the fatigue behavior. The incoherent interface and decohesion between the alumina matrix and the brittle secondary phases proved to significantly affect the ultimate strength of the material. Tool engagement also affected the fatigue resistance of the material.
Keywords
crack nucleation; fatigue; plastic deformation; surface topography
Authors
OHNIŠŤOVÁ, P.; PÍŠKA, M.; PETRENEC, M.; DLUHOŠ, J.; HORNÍKOVÁ, J.; ŠANDERA, P.
Released
3. 11. 2019
Publisher
MPDI
Location
Basel
ISBN
1996-1944
Periodical
Materials
Year of study
12
Number
21
State
Swiss Confederation
Pages from
1
Pages to
23
Pages count
URL
https://www.mdpi.com/1996-1944/12/21/3605/htm
Full text in the Digital Library
http://hdl.handle.net/11012/181103
BibTex
@article{BUT159700, author="Petra {Ohnišťová} and Miroslav {Píška} and Martin {Petrenec} and Jiří {Dluhoš} and Jana {Horníková} and Pavel {Šandera}", title="Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining", journal="Materials", year="2019", volume="12", number="21", pages="1--23", doi="10.3390/ma12213605", issn="1996-1944", url="https://www.mdpi.com/1996-1944/12/21/3605/htm" }