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Effect of Co additions on the phase formation, thermal stability, and mechanical properties of rapidly solidified Ti–Cu-based alloys

Published online by Cambridge University Press:  12 July 2017

Piter Gargarella ,
Simon Pauly ,
Claudio Shyinti Kiminami  and
Jürgen Eckert
Piter Gargarella*
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil; and IFW Dresden, Institute for Complex Materials, Dresden 01069, Germany
Simon Pauly
Affiliation:
IFW Dresden, Institute for Complex Materials, Dresden 01069, Germany
Claudio Shyinti Kiminami
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
Jürgen Eckert
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben A-8700, Austria; and Department Materials Physics, Montanuniversität Leoben, Leoben A-8700, Austria
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The addition of Co to CuZr-based shape memory bulk metallic glass composites stabilizes the high temperature B2-CuZr and decreases its stacking faulty energy, which promotes an increase in ductility caused by an easier twinning formation. A similar effect is expected for TiCu-based alloys. The present work aims to investigate the effect of Co additions on the phase formation, mechanical properties, and thermal stability of rapidly solidified Ti–Cu-based alloys. Rods of six Ti–Cu-based compositions with different amounts of Co were prepared by Cu-mold suction casting and investigated by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, dilatometry, and compression tests. The results show that the addition of Co decreases the glass-forming ability of Ti–Cu-based alloys and stabilizes B2 Ti(Cu,Ni,Co) at room temperature. The Co-added alloys exhibit an almost identical phase formation and microstructure, but their mechanical behavior is completely different nonetheless, which is mainly connected with the different composition of the B2 phase. The addition of Co makes the stress-induced martensitic transformation of this phase more difficult, which is one of the main reasons for the increase of the yield strength when a higher amount of Co is added.

Keywords

TiCu-based alloysmartensitic transformationthermal stabilitymechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 13 , 14 July 2017 , pp. 2578 - 2584
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

Contributing Editor: Mathias Göken

References

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