Structural Characterization of Nanocrystalline Ni_(50-x)Ti₅₀Cu_x (X = 5, 9 wt%) Alloys Produced by Mechanical Alloying

Bahman Nasiri-Tabrizi, Abbas Fahami

Materials Engineering Department, Najafabad Branch, Islamic Azad University, Isfahan, Iran.

DOI: 10.4236/anp.2013.22013                

Abstract

Nanocrystalline Ni_(50-x)Ti₅₀Cu_x(X = 5, 9 wt%) alloys were successfully produced by mechanical alloying. Mechanical activation was performed at different milling times under a high purity argon (99.998 vol%) atmosphere. Phase analysis and structural features of the samples were examined by X-ray diffraction (XRD). Results revealed that NiTiCu (B2) phase was achieved after 600 min of milling. The formation of this phase was mostly related to the critical factors in determining the site replacement of elements in Ni-Ti-Cu ternary system. After 600 min of milling, the average crystallite size and lattice strain of the samples were about 5 - 10 nm and 1.057% - 1.967%, respectively. Evaluation of the full width at half maximum (FWHM) values for all the samples indicated the occurrence of anisotropic line broadening. The determined amounts of crystallinity revealed that the fraction of crystalline phase decreased with increasing weight percentage of copper up to 9% and reached a minimum value after 600 min of milling. The lattice parameters and the unit cell volume of the milled samples were always larger than the standard values. In addition, lattice parameter deviation influenced by the weight percentage of copper. Based on the obtained data, mechanical alloying process can be used for production of nanocrystalline NiTiCu alloys with different structural features.

Keywords

Nanocrystalline Alloy; Mechanical Alloying; Phase Analysis; Structural Features

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	T. Mousavi, F. Karimzadeh and M. H. Abbasi, “Synthesis and Characterization of Nanocrystalline NiTi Intermetallic by Mechanical Alloying,” Materials Science and Engineering A, Vol. 487, No. 1-2, 2008, pp. 46-51. doi:10.1016/j.msea.2007.09.051
[2]	M. Morakabati, Sh. Kheirandish, M. Aboutalebi, A. Karimi Taheri and S. M. Abbasi, “The Effect of Cu Addition on the Hot Deformation Behavior of NiTi Shape Memory Alloys,” Journal of Alloys and Compounds, Vol. 499, No. 1, 2010, pp. 57-62. doi:10.1016/j.jallcom.2010.01.124
[3]	Q. Pan, L. Zheng, Y. Sang, Y. Li, L. Zhou and H. Zhang, “Effect of Casting Temperature on Microstructure in a Directionally Solidified Ni-44Ti-5Al-2Nb-1Mo Alloy,” Rare Metals, Vol. 30, No. 1, 2011, pp. 349-353. doi:10.1007/s12598-011-0301-x
[4]	A. Nespoli and S. Besseghini, “A Complete Thermo- Mechanical Study of a NiTiCu Shape Memory,” Journal of Thermal Analysis and Calorimetry, Vol. 103, No. 3, 2010, pp. 821-826. doi:10.1007/s10973-010-1042-z
[5]	S. O. Gashti, A. Shokuhfar, R. Ebrahimi-Kahrizsangi and B. Nasiri-Tabrizi, “Synthesis of Nanocrystalline Intermetallic Compounds in Ni-Ti-Al System by Mechanothermal Method,” Journal of Alloys and Compounds, Vol. 491, No. 1-2, 2010, pp. 344-348. doi:10.1016/j.jallcom.2009.10.169
[6]	C. Suryanarayana, “Mechanical Alloying and Milling,” Progress in Materials Science, Vol. 46, No. 1-2, 2001, pp. 1-184. doi:10.1016/S0079-6425(99)00010-9
[7]	C. L. De Castro and B. S. Mitchell, “Synthesis Function-alization and Surface Treatment of Nanoparticles,” In: M. I. Baraton, Ed., Nano-Particles from Mechanical Attrition, American Scientific Publishers, Stevenson Ranch, 2002, pp. 1-14.
[8]	M. Ghadimi, A. Shokuhfar, A. Zolriasatein and H. R. Rostami, “Morphological and Structural Evaluation of Na- nocrystalline NiTiCu Shape Memory Alloy Prepared via Mechanical Alloying and Annealing,” Materials Letters, Vol. 90, 2013, pp. 30-33. doi:10.1016/j.matlet.2012.09.008
[9]	B. S. Murty, S. Ranganathan and M. Mohan, “Solid State Amorphization in Binary Ti-Ni, Ti-Cu and Ternary Ti-Ni- Cu System by Mechanical Alloying,” Materials Sience and Engineering A, Vol. 149, No. 2, 1992, pp. 231-240. doi:10.1016/0921-5093(92)90384-D
[10]	B. Nasiri-Tabrizi and A. Fahami, “Synthesis and Characterization of Fluorapatite–Zirconia Composite Nanopowders,” Ceramics International, Vol. 39, No. 4, 2013, pp. 4329-4337.
[11]	F. Sun and F. H. S. Froes, “Synthesis and Characterization of Mechanical-Alloyed Ti-xMg Alloys,” Journal of Alloys and Compounds, Vol. 340, No. 1-2, 2002, pp. 220- 225. doi:10.1016/S0925-8388(01)02027-8
[12]	Z. Wei, T. Xia, J. Ma, W. Feng, J. Dai, Q. Wang and P. Yan, “Investigation of the Lattice Expansion for Ni Nanoparticles,” Materials Characterization, Vol. 58, No. 10, 2007, pp. 1019-1024. doi:10.1016/j.matchar.2006.08.004
[13]	E. Landi, A. Tampieri, G. Celotti and S. Sprio, “Densification Behavior and Mechanisms of Synthetic Hydroxyapatites,” Journal of the European Ceramic Society, Vol. 20, No. 14-15, 2000, pp. 2377-2387. doi:10.1016/S0955-2219(00)00154-0
[14]	I. N. Leontyev, V. E. Guterman, E. B. Pakhomova, P. E. Timoshenko, A. V. Guterman, I. N. Zakharchenko, G. P. Petin and B. Dkhil, “XRD and Electrochemical Investigation of Particle Size Effects in Platinum- Cobalt Cathode Electrocatalysts for Oxygen Reduction,” Journal of Alloys and Compounds, Vol. 500, No. 2, 2010, pp. 241-246. doi:10.1016/j.jallcom.2010.04.018.