Microstructure development of ultra fine grained Mg-22 wt%Gd alloy prepared by high pressure torsion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10366852" target="_blank" >RIV/00216208:11320/17:10366852 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2017.07.100" target="_blank" >http://dx.doi.org/10.1016/j.msea.2017.07.100</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2017.07.100" target="_blank" >10.1016/j.msea.2017.07.100</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure development of ultra fine grained Mg-22 wt%Gd alloy prepared by high pressure torsion

Popis výsledku v původním jazyce

A hardenable lightweight Mg-22 wt%Gd alloy with ultra fine grained (UFG) structure was prepared by high pressure torsion (HPT) at ambient temperature. The development of microstructure during HPT processing was investigated. A homogeneous UFG structure with grain size of 300 nm was achieved after 15 HPT revolutions. The UFG alloy exhibits enhanced strength due to work strengthening by tangled dislocations forming a dense forest throughout grains. Dislocation density in the sample was determined by positron annihilation spectroscopy (PAS) and X-ray line profile analysis (XLPA). It was found that there is an additional source of X-ray profile broadening in addition to small crystallites and micro-strains caused by dislocations. The additional micro-strain component was attributed to lattice modulation by Gd-rich nano-wires formed by agglomeration of Gd solutes and to strains arising from boundaries of crystallite domains and inter-domain interactions. Analysis of the influence of the crystallite size on the strength of UFG Mg-22 wt%Gd alloy revealed a breakdown in the HallPetch relationship when the crystallite size decreased below a critical value of approximate to 30 nm.

Název v anglickém jazyce

Microstructure development of ultra fine grained Mg-22 wt%Gd alloy prepared by high pressure torsion

Popis výsledku anglicky

A hardenable lightweight Mg-22 wt%Gd alloy with ultra fine grained (UFG) structure was prepared by high pressure torsion (HPT) at ambient temperature. The development of microstructure during HPT processing was investigated. A homogeneous UFG structure with grain size of 300 nm was achieved after 15 HPT revolutions. The UFG alloy exhibits enhanced strength due to work strengthening by tangled dislocations forming a dense forest throughout grains. Dislocation density in the sample was determined by positron annihilation spectroscopy (PAS) and X-ray line profile analysis (XLPA). It was found that there is an additional source of X-ray profile broadening in addition to small crystallites and micro-strains caused by dislocations. The additional micro-strain component was attributed to lattice modulation by Gd-rich nano-wires formed by agglomeration of Gd solutes and to strains arising from boundaries of crystallite domains and inter-domain interactions. Analysis of the influence of the crystallite size on the strength of UFG Mg-22 wt%Gd alloy revealed a breakdown in the HallPetch relationship when the crystallite size decreased below a critical value of approximate to 30 nm.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

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

2017

Kód důvěrnosti údajů

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

Název periodika

Materials Science &amp; Engineering A: Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

—

Svazek periodika

704

Číslo periodika v rámci svazku

říjen

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

11

Strana od-do

181-191

Kód UT WoS článku

000411847100023

EID výsledku v databázi Scopus

2-s2.0-85028748893