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

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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.

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ACKNOWLEDGMENTS

The authors would like to thank S. Donath, M. Frey, U. Wilke, B. Bartusch, and D. Lohse for technical assistance and K. Song, E. Mazzer, R.D. Cava, and F.A. Javid for stimulating technical discussions. Financial support through the German Science Foundation (DFG) under the Leibniz Program (Grant No. EC 111/26-1), the European Research Council under the ERC Advanced Grant INTELHYB (Grant No. ERC-2013-ADG-340025), the São Paulo Research Foundation (FAPESP) under the Tematic Project No. 2013/05987-8 and DFG and Brazil’s Federal Agency for the Support and Improvement of Higher Education (CAPES) under the program Brazilian-German Collaborative Research Initiative on Manufacturing Technology (BRAGECRIM, EC111/28-1) are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil

    Piter Gargarella & Claudio Shyinti Kiminami

  2. Institute for Complex Materials, IFW Dresden, Dresden, 01069, Germany

    Piter Gargarella & Simon Pauly

  3. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, A-8700, Austria

    Jürgen Eckert

  4. Department Materials Physics, Montanuniversität Leoben, Leoben, A-8700, Austria

    Jürgen Eckert

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  1. Piter Gargarella
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  2. Simon Pauly
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  4. Jürgen Eckert
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Correspondence to Piter Gargarella.

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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/.

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Gargarella, P., Pauly, S., Kiminami, C.S. et al. Effect of Co additions on the phase formation, thermal stability, and mechanical properties of rapidly solidified Ti–Cu-based alloys. Journal of Materials Research 32, 2578–2584 (2017). https://doi.org/10.1557/jmr.2017.237

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  • DOI: https://doi.org/10.1557/jmr.2017.237

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