Diffusion Processes in Early Stages of Precipitation in Mg-Gd and Mg- Tb Alloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F13%3A10190376" target="_blank" >RIV/00216208:11320/13:10190376 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.scientific.net/DDF.333.51" target="_blank" >http://www.scientific.net/DDF.333.51</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/DDF.333.51" target="_blank" >10.4028/www.scientific.net/DDF.333.51</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Diffusion Processes in Early Stages of Precipitation in Mg-Gd and Mg- Tb Alloys

Popis výsledku v původním jazyce

Early stages of precipitation were investigated in solution treated binary Mg-Tb and Mg- Gd alloys. The supersaturated solid solution of Gd (or Tb) in Mg was formed by fast quenching of the alloys from solution treatment temperature. Decomposition of thesupersaturated solid solution and precipitation effects were investigated by positron lifetime spectroscopy combined with microhardness testing. During solution treatment at elevated temperature some thermal vacancies form pairs with solute atoms. In quenched samples free vacancies are quickly annealed out, while more stable vacancies bound to solute atoms remain in the sample and enhance the diffusivity of solutes. The hardness of solution treated Mg-Tb and Mg-Gd alloys aged at ambient temperature rises due to formation of small clusters of Tb and Gd atoms. Isochronal annealing of Mg-Tb and Mg-Gd alloys leads to precipitation of coherent ?'' phase, semicoherent ?' phase and incoherent ? phase particles. It was found that natural aging

Název v anglickém jazyce

Diffusion Processes in Early Stages of Precipitation in Mg-Gd and Mg- Tb Alloys

Popis výsledku anglicky

Early stages of precipitation were investigated in solution treated binary Mg-Tb and Mg- Gd alloys. The supersaturated solid solution of Gd (or Tb) in Mg was formed by fast quenching of the alloys from solution treatment temperature. Decomposition of thesupersaturated solid solution and precipitation effects were investigated by positron lifetime spectroscopy combined with microhardness testing. During solution treatment at elevated temperature some thermal vacancies form pairs with solute atoms. In quenched samples free vacancies are quickly annealed out, while more stable vacancies bound to solute atoms remain in the sample and enhance the diffusivity of solutes. The hardness of solution treated Mg-Tb and Mg-Gd alloys aged at ambient temperature rises due to formation of small clusters of Tb and Gd atoms. Isochronal annealing of Mg-Tb and Mg-Gd alloys leads to precipitation of coherent ?'' phase, semicoherent ?' phase and incoherent ? phase particles. It was found that natural aging

Druh

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

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F10%2F0648" target="_blank" >GAP108/10/0648: Studium defektů v ikosaedrálních fázích v Mg slitinách</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Defect and Diffusion Forum

ISSN

1012-0386

e-ISSN

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Svazek periodika

333

Číslo periodika v rámci svazku

25 Jan 2013

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

10

Strana od-do

51-60

Kód UT WoS článku

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EID výsledku v databázi Scopus

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