Effect of different c/a ratio on the microstructure and mechanical properties in magnesium alloys processed by ECAP

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10335181" target="_blank" >RIV/00216208:11320/16:10335181 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.actamat.2015.12.050" target="_blank" >http://dx.doi.org/10.1016/j.actamat.2015.12.050</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.actamat.2015.12.050" target="_blank" >10.1016/j.actamat.2015.12.050</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of different c/a ratio on the microstructure and mechanical properties in magnesium alloys processed by ECAP

Popis výsledku v původním jazyce

Three magnesium alloys, AE21, AE42 and LAE442, were prepared by ECAP employing 1-12 passes. The microstructure evolution during ECAP was systematically analyzed by EBSD. The AE21 and AE42 alloys show typical texture after ECAP with grains predominantly oriented with basal planes inclined by similar to 55 degrees from processing direction. This texture results from activation of basal slip during ECAP following the route B-c. The LAE442 alloy showed different texture formation, which is fully explained by different c/a ratio and activation of non-basal slip. The differences in the microstructure evolution resulted in different performance in mechanical loading. In the present study a complex investigation of mechanical properties is performed using uni-axial tensile and compression deformation tests and also by Vickers indentation that simulates multi-axial deformation. Resulting microhardness evolution was therefore correlated to grain size according to Hall-Petch relation and to the evolution of dislocation density measured by positron annihilation spectroscopy. On the other hand, the yield stress in the tensile and compression uni-axial deformation tests was determined mainly by the texture. It was shown that by tailoring the c/a ratio the typical texture development could be effectively suppressed in magnesium alloys processed by ECAP and in such way the negative effect of texture on strength can be avoided.

Název v anglickém jazyce

Effect of different c/a ratio on the microstructure and mechanical properties in magnesium alloys processed by ECAP

Popis výsledku anglicky

Three magnesium alloys, AE21, AE42 and LAE442, were prepared by ECAP employing 1-12 passes. The microstructure evolution during ECAP was systematically analyzed by EBSD. The AE21 and AE42 alloys show typical texture after ECAP with grains predominantly oriented with basal planes inclined by similar to 55 degrees from processing direction. This texture results from activation of basal slip during ECAP following the route B-c. The LAE442 alloy showed different texture formation, which is fully explained by different c/a ratio and activation of non-basal slip. The differences in the microstructure evolution resulted in different performance in mechanical loading. In the present study a complex investigation of mechanical properties is performed using uni-axial tensile and compression deformation tests and also by Vickers indentation that simulates multi-axial deformation. Resulting microhardness evolution was therefore correlated to grain size according to Hall-Petch relation and to the evolution of dislocation density measured by positron annihilation spectroscopy. On the other hand, the yield stress in the tensile and compression uni-axial deformation tests was determined mainly by the texture. It was shown that by tailoring the c/a ratio the typical texture development could be effectively suppressed in magnesium alloys processed by ECAP and in such way the negative effect of texture on strength can be avoided.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Materialia

ISSN

1359-6454

e-ISSN

—

Svazek periodika

107

Číslo periodika v rámci svazku

-

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

83-95

Kód UT WoS článku

000373419600009

EID výsledku v databázi Scopus

2-s2.0-84957057345