Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10316206" target="_blank" >RIV/00216208:11320/15:10316206 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11661-015-2767-x" target="_blank" >http://dx.doi.org/10.1007/s11661-015-2767-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11661-015-2767-x" target="_blank" >10.1007/s11661-015-2767-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Popis výsledku v původním jazyce

Thermal effects on the precipitation stages in as-cast Al-0.70 at. pct Mn-0.15 at. pct Sc-0.05 at. pct Zr alloy were studied. The role of lattice defects was elucidated by positron annihilation spectroscopy (lifetime and coincidence Doppler broadening) enabling investigation of solutes clustering at the atomic scale. This technique has never been used in the Al-Sc- and/or Al-Zr-based alloys so far. Studies by positron annihilation were combined with resistometry, hardness measurements, and microstructure observations. Positrons trapped at defects are preferentially annihilated by Sc electrons. Lifetime of trapped positrons indicates that Sc atoms segregate at dislocations. Maximum fraction of positrons annihilated by Sc electrons occurring at 453 K (180 A degrees C) suggests that clustering of Sc bound with vacancies takes place. It is followed by peak of this fraction at 573 K (300 A degrees C). A rise of the contribution of trapped positrons annihilated by Zr electrons starting at 51

Název v anglickém jazyce

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Popis výsledku anglicky

Thermal effects on the precipitation stages in as-cast Al-0.70 at. pct Mn-0.15 at. pct Sc-0.05 at. pct Zr alloy were studied. The role of lattice defects was elucidated by positron annihilation spectroscopy (lifetime and coincidence Doppler broadening) enabling investigation of solutes clustering at the atomic scale. This technique has never been used in the Al-Sc- and/or Al-Zr-based alloys so far. Studies by positron annihilation were combined with resistometry, hardness measurements, and microstructure observations. Positrons trapped at defects are preferentially annihilated by Sc electrons. Lifetime of trapped positrons indicates that Sc atoms segregate at dislocations. Maximum fraction of positrons annihilated by Sc electrons occurring at 453 K (180 A degrees C) suggests that clustering of Sc bound with vacancies takes place. It is followed by peak of this fraction at 573 K (300 A degrees C). A rise of the contribution of trapped positrons annihilated by Zr electrons starting at 51

Druh

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

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

<a href="/cs/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Mikro- a nanokrystalické materiály s vysokým podílem rozhraní pro moderní strukturní aplikace, biodegradabilní implantáty a uchovávání vodíku</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

ISSN

1073-5623

e-ISSN

—

Svazek periodika

46A

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

1556-1564

Kód UT WoS článku

000350300900017

EID výsledku v databázi Scopus

2-s2.0-84925485182