A statistical analysis of compressive deformation mechanisms in an extruded Mg–3Y sheet

A statistical analysis of plastic deformation mechanisms was performed on an extruded Mg-3 wt%Y sheet during room temperature uniaxial compression along the extrusion direction. Grain-scale slip trace analysis and twin variant analysis were performed grain-by-grain to reveal the active slip/twinning...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-09, Vol.825, p.141927, Article 141927
Hauptverfasser: Hua, S., Jiang, Z.W., Wan, Y.F., Huang, G.H., Zhou, H., Zheng, J., Wang, Q.D., Yin, D.D.
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
container_volume 825
creator Hua, S.
Jiang, Z.W.
Wan, Y.F.
Huang, G.H.
Zhou, H.
Zheng, J.
Wang, Q.D.
Yin, D.D.
description A statistical analysis of plastic deformation mechanisms was performed on an extruded Mg-3 wt%Y sheet during room temperature uniaxial compression along the extrusion direction. Grain-scale slip trace analysis and twin variant analysis were performed grain-by-grain to reveal the active slip/twinning systems based on quasi-in-situ SEM and EBSD. The initial microstructure was fully recrystallized exhibiting typical rare-earth texture characteristics. The true stress-true plastic strain curve showed a sigmoidal shape indicating a profuse twinning activity which was consistent with the twin analysis. After 10% strain, there were 78 out of ~700 grains exhibited slip trace. In addition to the dominated basal slip (79.5%), considerable non-basal slips including 2nd pyramidal slip (11.5%) following prismatic slip (9%) were active. For twinning activity, among the ~250 grains analyzed at 10% strain, all the identified ~150 twins were tension twins with an area fraction of 19%. The twin variant selection did not solely follow the Schmid law, i.e. 42.3% twins exhibited low Schmid factor values (m0.75). However, the transmitted pairs with both large mnor sum and normalized m’ were preferred, and the fraction was over 64%. The twined number fraction was closely related to the maximum m values of prismatic slip. The present work implied that the twinning behavior is greatly dependent on the local conditions, and slip and twinning are closely related.
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Grain-scale slip trace analysis and twin variant analysis were performed grain-by-grain to reveal the active slip/twinning systems based on quasi-in-situ SEM and EBSD. The initial microstructure was fully recrystallized exhibiting typical rare-earth texture characteristics. The true stress-true plastic strain curve showed a sigmoidal shape indicating a profuse twinning activity which was consistent with the twin analysis. After 10% strain, there were 78 out of ~700 grains exhibited slip trace. In addition to the dominated basal slip (79.5%), considerable non-basal slips including 2nd pyramidal &lt;c + a&gt; slip (11.5%) following prismatic slip (9%) were active. For twinning activity, among the ~250 grains analyzed at 10% strain, all the identified ~150 twins were tension twins with an area fraction of 19%. The twin variant selection did not solely follow the Schmid law, i.e. 42.3% twins exhibited low Schmid factor values (m&lt;0.2) and 5.4% m values was negative. However, the proposed normalized m (mnor) can correlate the variant selection more effectively, and over 80% twins exhibited large mnor values. Twin transmission at grain boundary was observed for over 50% twins, and only 43.6% of them had high Luster-Morris parameter values (m’&gt;0.75). However, the transmitted pairs with both large mnor sum and normalized m’ were preferred, and the fraction was over 64%. The twined number fraction was closely related to the maximum m values of prismatic slip. 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A, Structural materials : properties, microstructure and processing</title><description>A statistical analysis of plastic deformation mechanisms was performed on an extruded Mg-3 wt%Y sheet during room temperature uniaxial compression along the extrusion direction. Grain-scale slip trace analysis and twin variant analysis were performed grain-by-grain to reveal the active slip/twinning systems based on quasi-in-situ SEM and EBSD. The initial microstructure was fully recrystallized exhibiting typical rare-earth texture characteristics. The true stress-true plastic strain curve showed a sigmoidal shape indicating a profuse twinning activity which was consistent with the twin analysis. After 10% strain, there were 78 out of ~700 grains exhibited slip trace. In addition to the dominated basal slip (79.5%), considerable non-basal slips including 2nd pyramidal &lt;c + a&gt; slip (11.5%) following prismatic slip (9%) were active. 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A, Structural materials : properties, microstructure and processing</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hua, S.</au><au>Jiang, Z.W.</au><au>Wan, Y.F.</au><au>Huang, G.H.</au><au>Zhou, H.</au><au>Zheng, J.</au><au>Wang, Q.D.</au><au>Yin, D.D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A statistical analysis of compressive deformation mechanisms in an extruded Mg–3Y sheet</atitle><jtitle>Materials science &amp; engineering. A, Structural materials : properties, microstructure and processing</jtitle><date>2021-09-21</date><risdate>2021</risdate><volume>825</volume><spage>141927</spage><pages>141927-</pages><artnum>141927</artnum><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>A statistical analysis of plastic deformation mechanisms was performed on an extruded Mg-3 wt%Y sheet during room temperature uniaxial compression along the extrusion direction. Grain-scale slip trace analysis and twin variant analysis were performed grain-by-grain to reveal the active slip/twinning systems based on quasi-in-situ SEM and EBSD. The initial microstructure was fully recrystallized exhibiting typical rare-earth texture characteristics. The true stress-true plastic strain curve showed a sigmoidal shape indicating a profuse twinning activity which was consistent with the twin analysis. After 10% strain, there were 78 out of ~700 grains exhibited slip trace. In addition to the dominated basal slip (79.5%), considerable non-basal slips including 2nd pyramidal &lt;c + a&gt; slip (11.5%) following prismatic slip (9%) were active. For twinning activity, among the ~250 grains analyzed at 10% strain, all the identified ~150 twins were tension twins with an area fraction of 19%. The twin variant selection did not solely follow the Schmid law, i.e. 42.3% twins exhibited low Schmid factor values (m&lt;0.2) and 5.4% m values was negative. However, the proposed normalized m (mnor) can correlate the variant selection more effectively, and over 80% twins exhibited large mnor values. Twin transmission at grain boundary was observed for over 50% twins, and only 43.6% of them had high Luster-Morris parameter values (m’&gt;0.75). However, the transmitted pairs with both large mnor sum and normalized m’ were preferred, and the fraction was over 64%. The twined number fraction was closely related to the maximum m values of prismatic slip. The present work implied that the twinning behavior is greatly dependent on the local conditions, and slip and twinning are closely related.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2021.141927</doi></addata></record>
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subjects Compacting
Deformation mechanisms
Grain boundaries
Luster-morris parameter
Mechanical twinning
Mg alloy
Plastic deformation
Rare earth elements
Recrystallization
Room temperature
Schmid factor
Slip
Slip activity
Slip trace analysis
Statistical analysis
Strain analysis
True stress
Twin variant
title A statistical analysis of compressive deformation mechanisms in an extruded Mg–3Y sheet
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