Formation of amorphous and nano-crystalline phases via mechanical alloying of elemental powder with stoichiometric composition of Ni0.5Ti0.4Nb0.1 and their thermodynamic evaluation using Medima model

Abbasi, Roozbeh; Kashani Bozorg, Seyed Farshid

doi:10.30501/jamt.2635.70256

Formation of amorphous and nano-crystalline phases via mechanical alloying of elemental powder with stoichiometric composition of Ni0.5Ti0.4Nb0.1 and their thermodynamic evaluation using Medima model

Authors

Roozbeh Abbasi

Seyed Farshid Kashani Bozorg

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran

10.30501/jamt.2635.70256

Abstract

Mechanical alloying of an elemental powder mixture with stoichiometric composition of Ti_0.4Ni_0.5Nb_0.1was conducted using planetary ball milling. The assessment of the formed phases was investigated using semi-empirical Miedema Model. In addition, the milled product was characterized using various techniques; X-ray diffraction studies revealed the formation of Ni (Ti) solid solution after the first hour of milling. However, dissolution of Nb was not found in neither of the other elements. After 7.5 h of milling, the formation of NiTi-based intermetallic compound begins while Nb is still remained as a free element. Finally, after 10h of milling, an amorphous phase was formed which remained for the next 10h. Field emission scanning electron microscopy investigations showed that a homogeneous structure is formed after 20h of milling, but further milling increases the product size due to agglomeration and cold welding of the relatively finer milling products. Transmission electron microscopy confirmed the presence of both the nano-crystalline NiTi intermetallic compound and amorphous phase. The experimental results were found to be in agreement with those of the thermodynamic calculations based on Miedema Model using Ni-Ti, Ni-Nb, Nb-Ti binary systems and Ni-Ti-Nb ternary system that predicted the formation of Ni (Ti) solid solution and immiscibility of Nb in Ti and Ni. In addition, a slight difference in the value of Gibss free energy of formation was found between the intermetallic compound and amorphous phase that confirms the their presence in the final milled product.

Keywords

NiTiNb

nano-structured materials

mechanical alloying

thermodynamic calculations based on Miedema Model

[1] Otsuka K, Ren X. Physical metallurge of Ti-Ni-based shape memory alloys. Progress in Materials Science 2005; 50(5): 511-678

[2] Cai W, Meng XL, Zhao LC. Recent development of NiTi-based shape memory alloys. Current Opinion Solid State and Materials Science 2005

[3] Cai W, Lu X L, Zhao L C. Damping behavior of NiTi-based shape memory alloys. Materials Science and Engineering: A 2005; 394(1-2): 78-82

[4] Drenchev, B., Spassov, T. Electrochemical hydriding of amorphous and nanocrystalline NiTi-based alloys. Journal of Alloys and Compounds, (2007). 441(1-2), 197–201.

[5] Piao, M., MIAZAKI, S., Otsuka, K., & Nishida, N. Effects of Nb addition on the microstructure of Ti-Ni alloys. Materials Transactions-JIM, (1992). 33(4), 337–345

[6] He XM, Rong LJ, Yan DS, Li YY. NiTiNb wide hysteresis shape memory alloy with low niobium content. Materials Science and Engineering A 2004

[7] J. Frenzel, Z. Zhang, K. Neuking, and G. Eggeler, High Quality Vacuum Induction Melting of Small Quantities of NiTi Shape MemoryAlloys in Graphite Crucibles,J. Alloys Compd., 2004, 385, p 214–223

[8] D.S. Grummon, J.A. Shaw, A. Gremillet, Appl. Phys. Lett. 82 (2003) 2727–2729

[9] A.E.W. Jarfors, C.S. Goh, E.S. Thian, Mater. Sci. Forum 437 (2003) 475–478

[10] Mousavi, T., Karimzadeh, F., & Abbasi, M. H. Synthesis and characterization of nanocrystalline NiTi intermetallic by mechanical alloying. Materials Science and Engineering: A, 487(1-2), (2008) 46–51.

[11] S. K. Sadrnezhaad Ph.D. & A. R. Selahi, Effect of Mechanical Alloying and Sintering on Ni–Ti Powders, Materials and Manufacturing Processes, (2004) 475-486

[12] H. Bakker, Enthalpies in Alloys: Miedema’s Semi-Empirical Model, Trans. Tech. Publications, Zurich, 1998

[13] B. Zhang, W.A. Jesser, Physica B 315 (2002) 123–132

[14] A. Takasaki, Phys. Status Solidi (a) 169 (1998) 183–191

[15] C. Suryanarayana. Mechanical alloying and milling. J. Progress in Materials. Sci. 46 (2001) 1-184

[16] A. Shirani Bidabadi, M.H. Enayati, E. Dastanpoor, R.A. Varin, M. Biglari, Nanocrystalline intermetallic compounds in the Ni-Al-Cr system synthesized by mechanical alloying and their thermodynamic analysis, Journal of Alloys and Compounds Volume 581, 25 December 2013, Pages 91–100

[17] A.R. Miedema and A.K. Neissen, Volume effects upon alloying of two transition metal, Physica 114B (1982) 367-374

[18] G. J. Van der Kolk, A. R. Miedema and A. K. Niessen Philips, on the composition range of amorphous binary transition metal alloys, Journal of the Less-Common metal, 145 (1988) 1 – 17

[19] A. R. Miedema, R. Boom* and F. R. DE Boer, on the heat of formation of solid alloys, Journal of the Less-Common Metals, 41 (1975) 283 – 298

[20] A W Weeber, Application of the Miedema model to formation enthalpies and crystallisation temperatures of amorphous alloys, J. Phys. F: Met. Phys. 17 (1987) 809-813. Printed in the UK

[21] L.J. Gallego, J.A. Somoza, J.A. Alonso, J. Phys. Condens. Mat. 2 (1990) 6245–6250.

[22] P.I. Loeff, A.W. Weeber, A.R. Miedema, J. Less-Common Met. 140 (1988) 299–305