Publication detail
Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy
FINTOVÁ, S. PANTĚLEJEV, L. KUNZ, L.
Czech title
Mikrostruktura a mechanické vlastnsoti ultra-jemnozrnné hořčíkové slitiny AZ91
English title
Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy
Type
conference paper
Language
en
Original abstract
Microstructure, mechanical properties, cyclic plastic deformation behavior and fatigue strength of ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP) were investigated. ECAP of originally cast alloy results in development of bimodal structure, improved yield stress, tensile strength and ductility when compared to the as-cast state. Endurance limit based on 107 cycles is also improved, however exhibits large scatter. Initiation of fatigue cracks takes place in regions of large grains in the bimodal structure, where the content of Mg17Al12 particles is low.
Czech abstract
V rámci práce byla zkoumána mikrostrukturam cyklické plastické chování a únavová pevnost ultrajemnozrnné (UFG) hořčíkové slitiny AZ91 připravené procesem ECAP. Bezkontrakční protlačování (ECAP) slitiny, která byla dodána ve stavu litém vedla ke vzniku bimodální struktury, zvýšení meze kluzu, meze pevnosti a tažnosti ve srovnání s dodaným litým stavem. Mez únavy stanovená na hladině 1E7 cyklů je také posunuta k vyšším hodnotám, nicméně vykazuje větší rozptyl hodnot. Únavové porušení iniciuje v oblastech velkých zrn bimodální struktury, kde je nízký obsah částic Mg17Al12.
English abstract
Microstructure, mechanical properties, cyclic plastic deformation behavior and fatigue strength of ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP) were investigated. ECAP of originally cast alloy results in development of bimodal structure, improved yield stress, tensile strength and ductility when compared to the as-cast state. Endurance limit based on 107 cycles is also improved, however exhibits large scatter. Initiation of fatigue cracks takes place in regions of large grains in the bimodal structure, where the content of Mg17Al12 particles is low.
Keywords in Czech
AZ91, ECAP, mikrostruktura, mechanické vlasntosti, cyklická plastická deformace, iniciace únavových trhlin
Keywords in English
AZ91, ECAP, microstructure, mechanical properties, cyclic plastic deformation, fatigue crack initiation
RIV year
2014
Released
09.04.2014
Publisher
Thomas Wohlbier, TTP USA
Location
Switzerland
ISBN
9783038350729
ISSN
0255-5476
Book
Metallography XV
Volume
782
Number
1
Pages from–to
384–389
Pages count
6
BIBTEX
@inproceedings{BUT106214,
author="Stanislava {Fintová} and Libor {Pantělejev} and Ludvík {Kunz},
title="Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy",
booktitle="Metallography XV",
year="2014",
volume="782",
number="1",
month="April",
pages="384--389",
publisher="Thomas Wohlbier, TTP USA",
address="Switzerland",
isbn="9783038350729",
issn="0255-5476"
}