Continuous measurement of m-parameter for analyzing plastic instability in a superplastic ultra-fine grained magnesium alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10369910" target="_blank" >RIV/00216208:11320/17:10369910 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2016.12.027" target="_blank" >http://dx.doi.org/10.1016/j.msea.2016.12.027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2016.12.027" target="_blank" >10.1016/j.msea.2016.12.027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Continuous measurement of m-parameter for analyzing plastic instability in a superplastic ultra-fine grained magnesium alloy

Popis výsledku v původním jazyce

In this paper, the superplastic properties of ultra-fine grained AZ31 Mg, alloy prepared by ECAP are investigated. Ultra-fine grained materials (UFG) often exhibit superplastic behavior, but UFG microstructure is not stable at increased temperatures. Due to recovery and grain growth the m-parameter of strain rate sensitivity may decrease during the tensile test. Methodology of continuous measurement of m-parameter during the tensile test is presented. Tensile tests were conducted at relatively low temperatures of 150-250 degrees C. The m-parameter decreased with increasing true strain for all studied conditions from approx. 0.5-0.3. The decrease was most pronounced for the highest temperature (250 degrees C) and was attributed to recovery and recrystallization. Three different criteria of plastic instability were evaluated. Hart&apos;s criterion significantly underestimated the stability of plastic deformation, whereas other criteria based on geometrical model of grain boundary sliding were more appropriate for the description of elongation up to fracture.

Název v anglickém jazyce

Continuous measurement of m-parameter for analyzing plastic instability in a superplastic ultra-fine grained magnesium alloy

Popis výsledku anglicky

In this paper, the superplastic properties of ultra-fine grained AZ31 Mg, alloy prepared by ECAP are investigated. Ultra-fine grained materials (UFG) often exhibit superplastic behavior, but UFG microstructure is not stable at increased temperatures. Due to recovery and grain growth the m-parameter of strain rate sensitivity may decrease during the tensile test. Methodology of continuous measurement of m-parameter during the tensile test is presented. Tensile tests were conducted at relatively low temperatures of 150-250 degrees C. The m-parameter decreased with increasing true strain for all studied conditions from approx. 0.5-0.3. The decrease was most pronounced for the highest temperature (250 degrees C) and was attributed to recovery and recrystallization. Three different criteria of plastic instability were evaluated. Hart&apos;s criterion significantly underestimated the stability of plastic deformation, whereas other criteria based on geometrical model of grain boundary sliding were more appropriate for the description of elongation up to fracture.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

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

Projekt

<a href="/cs/project/GA16-08963S" target="_blank" >GA16-08963S: Perspektivní hořčíkové slitiny se zlepšenými korozními, biologickými a mechanickými vlastnostmi</a><br>

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

684

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

5

Strana od-do

110-114

Kód UT WoS článku

000393938300013

EID výsledku v databázi Scopus

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