An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10287618" target="_blank" >RIV/00216208:11320/15:10287618 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388998:_____/15:00440339 RIV/68407700:21340/15:00222595

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10853-014-8641-1" target="_blank" >http://dx.doi.org/10.1007/s10853-014-8641-1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10853-014-8641-1" target="_blank" >10.1007/s10853-014-8641-1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy

Popis výsledku v původním jazyce

Internal friction in ultrafine-grained AZ31 magnesium alloy is investigated by resonant ultrasound spectroscopy. It is shown that the internal friction significantly increases at elevated temperatures (greater than or similar to 100 degrees C), and that this increase can be attributed to grain boundary sliding (GBS). The evolution of this phenomenon with grain refinement is studied by comparing the results obtained for an extruded material and for materials after additional one, two, and four passes of equal channel angular pressing. It is observed that the activation energy for diffusive GBS significantly decreases with decreasing grain size, and so does also the threshold temperature above which this internal friction mechanism is dominant. The results prove that the ultrafine-grained AZ31 alloys exhibit diffusive GBS at temperatures close to the ambient temperature, which is an interesting finding with respect to the possible applications of these alloys in superplastic forming technologies.

Název v anglickém jazyce

An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy

Popis výsledku anglicky

Internal friction in ultrafine-grained AZ31 magnesium alloy is investigated by resonant ultrasound spectroscopy. It is shown that the internal friction significantly increases at elevated temperatures (greater than or similar to 100 degrees C), and that this increase can be attributed to grain boundary sliding (GBS). The evolution of this phenomenon with grain refinement is studied by comparing the results obtained for an extruded material and for materials after additional one, two, and four passes of equal channel angular pressing. It is observed that the activation energy for diffusive GBS significantly decreases with decreasing grain size, and so does also the threshold temperature above which this internal friction mechanism is dominant. The results prove that the ultrafine-grained AZ31 alloys exhibit diffusive GBS at temperatures close to the ambient temperature, which is an interesting finding with respect to the possible applications of these alloys in superplastic forming technologies.

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/GA13-13616S" target="_blank" >GA13-13616S: Vyšetřování elastických vlastností materiálů připravených metodou intenzivní plastické deformace</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>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

Journal of Materials Science

ISSN

0022-2461

e-ISSN

—

Svazek periodika

50

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

808-818

Kód UT WoS článku

000345407900032

EID výsledku v databázi Scopus

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