Detail publikace

Fatigue behaviour of AZ91 magnesium alloy in as-cast and severe plastic deformed conditions

KUNZ, L. FINTOVÁ, S.

Originální název

Fatigue behaviour of AZ91 magnesium alloy in as-cast and severe plastic deformed conditions

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

Fatigue strength, crack initiation and microstructure were experimentally investigated in an as-cast AZ91 alloy and in ultrafine-grained (UFG) AZ91 alloy processed by equal channel angular pressing (ECAP). The microstructure after ECAP is bimodal, consisting of fine-grained regions and clusters of larger grains with lower density of intermetallic particles. It has been found that the ECAP substantially increases the tensile strength (factor of two), improves ductility (factor of five) and improves the fatigue strength in low-cycle fatigue region. The improvement of the endurance limit based on 107 cycles is weak. The cyclic slip bands, as sites of the fatigue crack initiation on material surface, were investigated. Focussed ion beam technique (FIB) was applied to reveal the surface relief and the microstructure in the vicinity of early fatigue cracks. No grain coarsening was observed in the close vicinity of the initiated cracks. Fatigue cracks in ultrafine-grained structure develop both in the regions of larger grains and also in the fine grained areas. Two types of crack initiation were observed.

Klíčová slova

AZ91, ECAP, microstructure, mechanical properties, cyclic plastic deformation, fatigue crack initiation

Autoři

KUNZ, L.; FINTOVÁ, S.

Rok RIV

2014

Vydáno

12. 3. 2014

Nakladatel

Trans Tech Publications

Místo

Switzerland

ISBN

978-3-03835-008-8

Kniha

11th International Fatigue Congress

ISSN

1022-6680

Periodikum

Advanced Materials Research

Ročník

891-892

Číslo

3

Stát

Švýcarská konfederace

Strany od

397

Strany do

402

Strany počet

6

BibTex

@inproceedings{BUT110648,
  author="Ludvík {Kunz} and Stanislava {Fintová}",
  title="Fatigue behaviour of AZ91 magnesium alloy in as-cast and severe plastic deformed conditions",
  booktitle="11th International Fatigue Congress",
  year="2014",
  journal="Advanced Materials Research",
  volume="891-892",
  number="3",
  pages="397--402",
  publisher="Trans Tech Publications",
  address="Switzerland",
  doi="10.4028/www.scientific.net/AMR.891-892.397",
  isbn="978-3-03835-008-8",
  issn="1022-6680"
}