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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

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

Project

<a href="/en/project/GA16-08963S" target="_blank" >GA16-08963S: Advanced magnesium alloys with tailored corrosion, biological and mechanical properties</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

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

Name of the periodical

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

ISSN

0921-5093

e-ISSN

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Volume of the periodical

684

Issue of the periodical within the volume

neuveden

Country of publishing house

CH - SWITZERLAND

Number of pages

5

Pages from-to

110-114

UT code for WoS article

000393938300013

EID of the result in the Scopus database

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