Publication detail

Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP

FINTOVÁ, S. KUNZ, L.

Original Title

Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP

Type

conference paper

Language

English

Original Abstract

Mechanism of fatigue crack initiation was investigated in ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP). Fatigue behaviour of UFG material was compared to the behaviour of material in an initial as-cast state. Focused ion beam technique (FIB) was applied to reveal the surface relief and early fatigue cracks. Two substantially different mechanisms of crack initiation were observed in UFG structure, which can be characterized as bimodal even after 6 ECAP passes by route Bc. The bimodality consists in a coexistence of very fine grained areas with higher content of Mg17Al12 particles and areas exhibiting somewhat larger grains and lower density of particles. The fatigue cracks which initiate in areas of larger grains are related to the cyclic slip bands; this initiation mechanism is similar to that observed in cast alloy. The second initiation mechanism is related to the grain boundary cracking which takes place predominantly in the fine grained areas.

Keywords

fatigue crack initiation, fatigue, AZ91 magnesium alloy

Authors

FINTOVÁ, S.; KUNZ, L.

RIV year

2014

Released

8. 8. 2014

Publisher

IOP Publishing

ISBN

978-1-63439-874-9

Book

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION. INTERNATIONAL CONFERENCE. 6TH 2014. (NanoSPD6) (2 PARTS)

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

63

Number

8

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

http://iopscience.iop.org/article/10.1088/1757-899X/63/1/012159

Full text in the Digital Library

http://hdl.handle.net/11012/137197

BibTex

@inproceedings{BUT110649,
  author="Stanislava {Fintová} and Ludvík {Kunz}",
  title="Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP",
  booktitle="NANOMATERIALS BY SEVERE PLASTIC DEFORMATION. INTERNATIONAL CONFERENCE. 6TH 2014. (NanoSPD6) (2 PARTS)",
  year="2014",
  journal="IOP Conference Series: Materials Science and Engineering",
  volume="63",
  number="8",
  pages="1--8",
  publisher="IOP Publishing",
  doi="10.1088/1757-899X/63/1/012159",
  isbn="978-1-63439-874-9",
  issn="1757-8981",
  url="http://iopscience.iop.org/article/10.1088/1757-899X/63/1/012159"
}