Publication detail

Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

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

English Title

Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining

Type

journal article

Language

en

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.

English 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

Released

03.11.2019

Publisher

MPDI

Location

Basel

Pages from

1

Pages to

23

Pages count

23

URL

Full text in the Digital Library

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",
  annote="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.",
  address="MPDI",
  chapter="159700",
  doi="10.3390/ma12213605",
  howpublished="online",
  institution="MPDI",
  number="21",
  volume="12",
  year="2019",
  month="november",
  pages="1--23",
  publisher="MPDI",
  type="journal article"
}