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Mechanical and microstructural characterization of magnesium single crystals

Published online by Cambridge University Press:  24 November 2017

Pravahan Salunke Open the ORCID record for Pravahan Salunke [Opens in a new window] ,
Vibhor Chaswal ,
Guangqi Zhang ,
Svitlana Fialkova ,
Sergei Yarmolenko  and
Vesselin Shanov
Pravahan Salunke
Affiliation:
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA
Vibhor Chaswal
Affiliation:
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA
Guangqi Zhang
Affiliation:
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA
Svitlana Fialkova
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Fort Interdisciplinary Research Center, Greensboro, North Carolina 27411, USA
Sergei Yarmolenko
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Fort Interdisciplinary Research Center, Greensboro, North Carolina 27411, USA
Vesselin Shanov*
Affiliation:
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA; and Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, 601 Engineering Research Center, Cincinnati, Ohio 45221, USA
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

This study describes results from mechanical tests conducted on magnesium single crystals in comparison with polycrystalline magnesium. It was found by impact testing that the magnesium single crystal is highly ductile due to energy absorption by twinning and slip, while the polycrystalline samples fracture easily upon impact. Compressive testing along two orthogonal directions at low plastic strains was also performed. The microstructure studies by electron backscatter diffraction and XRD pole figure analysis revealed profuse ( $10\overline12$ ) twinning when compression is done along the growth plane (72 16 $\overline {88}$ 62). The twinning and interaction between different twin modes resulted in incipient recrystallization at strains as low as 8% at room temperature. Compression along the nearly orthogonal plane (2 2 $\bar{4}$ 15) was marked by a much lower degree of both twinning and recrystallization. The variation in microstructural response with the orientation of loading allows for a wide range for tailoring mechanical properties of pure magnesium single crystals without any need of alloying.

Keywords

magnesium single crystalmechanical testingtwinningrecrystallizationcompressive testingductility EBSDpole figure analysis
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 22 , 28 November 2017 , pp. 4196 - 4205
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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