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

  • Piter Gargarella (a1), Simon Pauly (a2), Claudio Shyinti Kiminami (a3) and Jürgen Eckert (a4)

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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A. Inoue and A. Takeuchi : Recent development and application products of bulk glassy alloys. Acta Mater. 59, 2243 (2011).

C.A. Schuh , T.C. Hufnagel , and U. Ramamurty : Mechanical behavior of amorphous alloys. Acta Mater. 55, 4067 (2007).

J. Eckert , J. Das , S. Pauly , and C. Duhamel : Processing routes, microstructure and mechanical properties of metallic glasses and their composites. Adv. Eng. Mater. 9, 443 (2007).

D.C. Hofmann , J-Y. Suh , A. Wiest , G. Duan , M-L. Lind , M.D. Demetriou , and W.L. Johnson : Designing metallic glass matrix composites with high toughness and tensile ductility. Nature 451, 1085 (2008).

Y. Wu , Y. Xiao , G. Chen , C.T. Liu , and Z. Lu : Bulk metallic glass composites with transformation-mediated work-hardening and ductility. Adv. Mater. 22, 2770 (2010).

D.C. Hofmann , J-Y. Suh , A. Wiest , M-L. Lind , M.D. Demetriou , and W.L. Johnson : Development of tough, low-density titanium-based bulk metallic glass matrix composites with tensile ductility. Proc. Natl. Acad. Sci. U. S. A. 105, 20136 (2008).

J. Das , S. Pauly , M. Boström , K. Durst , M. Göken , and J. Eckert : Designing bulk metallic glass and glass matrix composites in martensitic alloys. J. Alloys Compd. 483, 97 (2009).

P. Gargarella , S. Pauly , K.K. Song , J. Hu , N.S. Barekar , M. Samadi Khoshkhoo , A. Teresiak , H. Wendrock , U. Kühn , C. Ruffing , E. Kerscher , and J. Eckert : Ti–Cu–Ni shape memory bulk metallic glass composites. Acta Mater. 61, 151 (2013).

S. Pauly , S. Gorantla , G. Wang , U. Kühn , and J. Eckert : Transformation-mediated ductility in CuZr-based bulk metallic glasses. Nat. Mater. 9, 473 (2010).

S. Pauly , G. Liu , G. Wang , U. Kühn , N. Mattern , and J. Eckert : Microstructural heterogeneities governing the deformation of Cu47.5Zr47.5Al5 bulk metallic glass composites. Acta Mater. 57, 5445 (2009).

K.K. Song , S. Pauly , Y. Zhang , R. Li , S. Gorantla , N. Narayanan , U. Kühn , T. Gemming , and J. Eckert : Triple yielding and deformation mechanisms in metastable Cu47.5Zr47.5Al5 composites. Acta Mater. 60, 6000 (2012).

G.Z. Ma , B.A. Sun , S. Pauly , K.K. Song , U. Kühn , D. Chen , and J. Eckert : Effect of Ti substitution on glass-forming ability and mechanical properties of a brittle Cu–Zr–Al bulk metallic glass. Mater. Sci. Eng., A 563, 112 (2013).

S. Pauly , J. Das , J. Bednarcik , N. Mattern , K.B. Kim , D.H. Kim , and J. Eckert : Deformation-induced martensitic transformation in Cu–Zr–(Al,Ti) bulk metallic glass composites. Scr. Mater. 60, 431 (2009).

K. Kosiba , P. Gargarella , S. Pauly , U. Kuhn , and J. Eckert : Predicted glass-forming ability of Cu–Zr–Co alloys and their crystallization behavior. J. Appl. Phys. 113, 123505 (2013).

K.K. Song , S. Pauly , Y. Zhang , P. Gargarella , R. Li , N.S. Barekar , U. Kühn , M. Stoica , and J. Eckert : Strategy for pinpointing the formation of B2 CuZr in metastable CuZr-based shape memory alloys. Acta Mater. 59, 6620 (2011).

Y. Wu , D.Q. Zhou , W.L. Song , H. Wang , Z.Y. Zhang , D. Ma , X.L. Wang , and Z.P. Lu : Ductilizing bulk metallic glass composite by tailoring stacking fault energy. Phys. Rev. Lett. 109, 245506 (2012).

P. Gargarella , S. Pauly , M. Samadi Khoshkhoo , U. Kühn , and J. Eckert : Phase formation and mechanical properties of Ti–Cu–Ni–Zr bulk metallic glass composites. Acta Mater. 65, 259 (2014).

A. Inoue : Stabilization of metallic supercooled liquid and bulk amorphous alloys. Acta Mater. 48, 279 (2000).

H. Men , S.J. Pang , and T. Zhang : Glass-forming ability and mechanical properties of Cu50Zr50−x Ti x alloys. Mater. Sci. Eng., A 408, 326 (2005).

Y-L. Wang , E. Ma , and J. Xu : Bulk metallic glass formation near the TiCu–TiNi pseudo-binary eutectic composition. Philos. Mag. Lett. 88, 319 (2008).

N.S. Barekar , S. Pauly , R.B. Kumar , U. Kühn , B.K. Dhindaw , and J. Eckert : Structure–property relations in bulk metallic Cu–Zr–Al alloys. Mater. Sci. Eng., A 527, 5867 (2010).

M. Zarinejad and Y. Liu : Dependence of transformation temperatures of NiTi-based shape-memory alloys on the number and concentration of valence electrons. Adv. Funct. Mater. 18, 2789 (2008).

K. Otsuka and X. Ren : Physical metallurgy of Ti–Ni-based shape memory alloys. Prog. Mater. Sci. 50, 511 (2005).

K.A. Gschneidner Jr., M. Ji , C.Z. Wang , K.M. Ho , A.M. Russell , Y. Mudryk , A.T. Becker , and J.L. Larson : Influence of the electronic structure on the ductile behavior of B2 CsCl-type AB intermetallics. Acta Mater. 57, 5876 (2009).

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Journal of Materials Research
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