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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Acta Physica Polonica A

ISSN

0587-4246

e-ISSN

—

Svazek periodika

131

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

4

Strana od-do

1303-1306

Kód UT WoS článku

000403507600026

EID výsledku v databázi Scopus

—