Modification of Microstructure and Properties of Extruded Mg–Li–Al Alloys of α and α β Phase Composition using ECAP Processing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F17%3A10235833" target="_blank" >RIV/61989100:27230/17:10235833 - isvavai.cz</a>

Result on the web

<a href="http://przyrbwn.icm.edu.pl/APP/PDF/131/a131z5bp01.pdf" target="_blank" >http://przyrbwn.icm.edu.pl/APP/PDF/131/a131z5bp01.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.131.1303" target="_blank" >10.12693/APhysPolA.131.1303</a>

Result language

angličtina

Original language name

Modification of Microstructure and Properties of Extruded Mg–Li–Al Alloys of α and α β Phase Composition using ECAP Processing

Original language description

Two magnesium based alloys containing 4.5 wt% Li and 1.5 wt% Al (alloy 1) and 9 wt% Li and 1.5 wt% Al (alloy 2) were cast under argon atmosphere and hot extruded at 350 C. Microstructure of alloy 1 consisted of hexagonal phase of average grain size 20 m and small aluminum rich precipitates being the most probably AlLi2Mg phase. Alloy 2 in the extruded form consisted of lamellas of + phases of thickness 5-20 m and length above 100 m. Significant grain refinement down to about 2 m was observed in one-phase hexagonal (hcp) alloy 1 after one pass of ECAP processing with helical component. Two-phase (hcp + bcc) alloy 2 showed higher non-homogeneity after the first equal channel angular pressing pass due to easier deformation of softer bcc phase, while both, and phases exhibited low angle grain boundaries. The hardness and the yield strength of the alloys were higher for alloy 1 (68 HV and 205 MPa, respectively) than those of alloy 2 (61 HV and 175 MPa). Subsequent equal channel angular pressing passes were performed at lower extrusion stress. The hardness of both alloys did not change significantly after subsequent equal channel angular pressing passes and revealed tendency to decrease. Two-phase alloy showed superplastic properties already after one equal channel angular pressing pass at 160 C with grain growth after superplastic tensile testing. Single phase hcp alloy did not show such properties after 1 pass, but after a few equal channel angular pressing passes it could be superplastically formed.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2017

Confidentiality

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

Name of the periodical

Acta Physica Polonica A

ISSN

0587-4246

e-ISSN

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Volume of the periodical

131

Issue of the periodical within the volume

5

Country of publishing house

PL - POLAND

Number of pages

4

Pages from-to

1303-1306

UT code for WoS article

000403507600026

EID of the result in the Scopus database

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