Publication detail

Microstructural changes of ECAP-processed magnesium alloy AZ91 during cyclic loading at different stress-amplitude levels

ŠTĚPÁNEK, R. PANTĚLEJEV, L. MAN, O. GUAGLIANO, M. VEDANI, M. MOSTAED, E.

English title

Microstructural changes of ECAP-processed magnesium alloy AZ91 during cyclic loading at different stress-amplitude levels

Type

journal article in Web of Science

Language

en

Original abstract

Microstructural changes of magnesium alloy AZ91 after fatigue loading in the EX-ECAP state were evaluated using EBSD. It was found that both the number fraction of low-angle boundaries and parameter KAM decreased after the testing at a stress amplitude of 160 MPa but started to increase with the increasing stress amplitude. This behaviour can be explained with a mutual influence of dislocation accumulation (which is stronger with a higher stress amplitude) and dynamic softening (which is weaker with a decreasing number of cycles/cycles to failure). The average grain size remained almost unchanged except at a stress amplitude of 180 MPa, which could have been caused by certain conditions allowing an ideal development of both mentioned phenomena.

English abstract

Microstructural changes of magnesium alloy AZ91 after fatigue loading in the EX-ECAP state were evaluated using EBSD. It was found that both the number fraction of low-angle boundaries and parameter KAM decreased after the testing at a stress amplitude of 160 MPa but started to increase with the increasing stress amplitude. This behaviour can be explained with a mutual influence of dislocation accumulation (which is stronger with a higher stress amplitude) and dynamic softening (which is weaker with a decreasing number of cycles/cycles to failure). The average grain size remained almost unchanged except at a stress amplitude of 180 MPa, which could have been caused by certain conditions allowing an ideal development of both mentioned phenomena.

Keywords in English

magnesium alloy; ECAP; EBSD; fatigue loading

Released

06.02.2018

Publisher

IMT Ljubljana

Location

Ljubljana, Slovinsko

ISSN

1580-2949

Volume

52

Number

1

Pages from–to

9–13

Pages count

5

BIBTEX


@article{BUT146130,
  author="Roman {Štěpánek} and Libor {Pantělejev} and Ondřej {Man} and Mario {Guagliano} and Maurizio {Vedani} and Ehsan {Mostaed},
  title="Microstructural changes of ECAP-processed magnesium alloy AZ91 during cyclic loading at different stress-amplitude levels",
  year="2018",
  volume="52",
  number="1",
  month="February",
  pages="9--13",
  publisher="IMT Ljubljana",
  address="Ljubljana, Slovinsko",
  issn="1580-2949"
}