Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F14%3APU111323" target="_blank" >RIV/00216305:26620/14:PU111323 - isvavai.cz</a>
Result on the web
<a href="http://iopscience.iop.org/article/10.1088/1757-899X/63/1/012159" target="_blank" >http://iopscience.iop.org/article/10.1088/1757-899X/63/1/012159</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1757-899X/63/1/012159" target="_blank" >10.1088/1757-899X/63/1/012159</a>

Result language
angličtina
Original language name
Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP
Original language description
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.
Czech name
—
Czech description
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Project
<a href="/en/project/EE2.3.30.0039" target="_blank" >EE2.3.30.0039: Excellent young researcher at BUT</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
NANOMATERIALS BY SEVERE PLASTIC DEFORMATION. INTERNATIONAL CONFERENCE. 6TH 2014. (NanoSPD6) (2 PARTS)
ISBN
978-1-63439-874-9
ISSN
1757-8981
e-ISSN
—
Number of pages
8
Pages from-to
1-8
Publisher name
IOP Publishing
Place of publication
Neuveden
Event location
Metz
Event date
Jun 30, 2014
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000347246200160

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