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

WoS Article

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.

Keywords in English

magnesium alloy; ECAP; EBSD; fatigue loading

Released

2018-02-06

Publisher

IMT Ljubljana

Location

Ljubljana, Slovinsko

ISSN

1580-2949

Journal

Materiali in Tehnologije

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",
  journal="Materiali in Tehnologije",
  year="2018",
  volume="52",
  number="1",
  pages="9--13",
  doi="10.17222/mit.2017.087",
  issn="1580-2949"
}