OJAppS  Vol.3 No.1 , March 2013
Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods
Abstract: A novel reduction technique has been developed to synthesize nano-sized tungsten heavy alloys powders and compared with the same powders processed by mechanical alloying technique. In the first method, nano-sized tungsten heavy alloys powders have been obtained by reduction of precursors obtained by spray drying of several appropriate aqueous solutions, which were made from salts containing tungsten, cobalt, and nickel. By adjusting the stoichiometry of the component of the solutions, it is possible to obtain the desired chemical composition of the tungsten heavy alloys powders. In the second method, highly pure elemental powders of tungsten heavy alloys have been mechanically alloyed in a tumbler ball mill for different milling time. The investigated tungsten heavy alloy powders with the composition (95%W-3.5%Ni-1.5%Fe), (93%W-4.5%Ni-1.0%Fe-1.5%Co), and (90%W-6%Ni-4%Cu) have been prepared using both methods. The prepared powders have been compacted at 70 bar (200 MPa) and sintered in vacuum furnace at 1400℃. Vacuum sintering was carried out to achieve full densification of the produced tungsten heavy alloys. The investigated materials were going to be evaluated the physical and mechanical properties of the sintered parts such as density; electrical conductivity, hardness, and transverse rupture strength. The results reveal that, the grain size of alloys fabricated by chemical reduction technique (53.1 - 63.8 nm) is smaller than that fabricated by mechanical alloying technique (56.4 - 71.4 nm).
Cite this paper: Z. Hamid, S. Moustafa, W. Daoush, F. Mouez and M. Hassan, "Fabrication and Characterization of Tungsten Heavy Alloys Using Chemical Reduction and Mechanical Alloying Methods," Open Journal of Applied Sciences, Vol. 3 No. 1, 2013, pp. 15-27. doi: 10.4236/ojapps.2013.31003.

[1]   R. Gero, L. Borukhin and I. Pikus, “Some Structural Effects of Plastic Deformation on Tungsten Heavy Metal Alloys,” Materials Science and Engineering: A, Vol. 302, No. 1, 2001, pp. 162-167. doi:10.1016/S0921-5093(00)01369-1

[2]   W. S. Lee, G. L. Xiea and C. F. Lin, “The Strain Rate and Temperature Dependence of the Dynamic Impact Response of Tungsten Composite,” Materials Science and Engineering: A, Vol. 257, No. 2, 1998, pp. 256-267. doi:10.1016/S0921-5093(98)00852-1

[3]   I. S. Humail, F. Akhtar, S. J. Askari, M. Tufail and X. H Qu, “Tensile Behavior Change Depending on the Varying Tungsten Content of W-Ni-Fe Alloys,” International Journal of Refractory Metals and Hard Materials, Vol. 25, No. 5-6, 2007, pp. 380-385. doi:10.1016/j.ijrmhm.2006.12.003

[4]   J. L. Fan, X. Gong, B. Y. Huang, M. Song, T. Liu, J. M. Tian, “Densi?cation Behavior of Nanocrystalline W-Ni Fe Composite Powder Prepared by Sol-Spray Drying and Hydrogen Reduction Process,” Journal of Alloys and Compounds, Vol. 489, No. 1, 2010, pp. 188-194. doi:10.1016/j.jallcom.2009.09.050

[5]   J. L. Fan, X. Gong, B. Y. Huang, M. Song, T. Liu and M. G. Qi, “Dynamic Failure and Adiabatic Shear Bands in Fine Grain 93W-4.9Ni-2.1Fe Alloy with Y2O3 Addition under Lower High-Strain-Rate, (HSR) Compression,” Mechanics of Materials, Vol. 42, No. 1, 2010, pp. 24-30. doi:10.1016/j.mechmat.2009.08.006

[6]   X. Gong, J. L. Fan, B. Y. Huang and J. M. Tian, “Micro structure Characteristics and a Deformation Mechanism of Fine-Grained Tungsten Heavy Alloys under High Strain Rate Compression,” Materials Science and Engineering: A, Vol. 527, No. 29-30, 2010, pp. 7565-7570. doi:10.1016/j.msea.2010.07.102

[7]   R. M. German, In: A. Bose and R. J. Dowding, Eds., Proceedings of the International Conference on Tungsten and Tungsten Alloys, MPIF, New Jersey, 1992, p. 3.

[8]   W. D. Cai, Y. Li, R. J. Dowding, F. A. Mohamed and E. J. Lavernia, “A Review of Tungsten-Based Alloys as Kinetic Energy Penetrator Materials,” Review of Particulate Materials, Vol. 3, No. 1, 1995, pp. 71-132.

[9]   Y. Wu, R. M. German, B. Marx, P. Suri and R. Bollina, “Comparison of Densification and Distortion Behaviors of W-Ni-Cu and W-Ni-Fe Heavy Alloys in Liquid-Phase Sintering,” Journal of Materials Science, Vol. 38, No. 10, 2003, pp. 2271-2281. doi:10.1023/A:1023725508608

[10]   B. Huang, J. Fan, S. Liang and X. Qu, “The Rheological and Sintering Behavior of W-Ni-Fe Nano-Structured Crystalline Powder,” Journal of Materials Processing Tech nology, Vol. 137, No. 1-3, 2003, pp. 177-182. doi:10.1016/S0924-0136(02)01090-7

[11]   S. H. Hong and H. J. Ryu, “Combination of Mechanical Alloying and Two-Stage Sintering of a 93W-5.6Ni-1.4Fe Tungsten Heavy Alloy,” Materials Science and Engineering: A, Vol. 344, No. 1-2, 2003, pp. 253-260. doi:10.1016/S0921-5093(02)00410-0

[12]   F. He, M. Wang and X. Lu, “Properties of Electrodeposi ted Amorphous Fe-Ni-W Alloy Deposits,” Transactions of Nonferrous Metals Society of China, Vol. 16, No. 6, 2006, pp. 1289-1294. doi:10.1016/S1003-6326(07)60008-9

[13]   M. Donten, H. Cesiulis and Z. Stojek, “Electrodeposition and Properties of Ni-W, Fe-W and Fe-Ni-W Amorphous Alloys. A Comparative Study,” Electrochimica Acta, Vol. 45, No. 20, 2000, pp. 3389-3396. doi:10.1016/S0013-4686(00)00437-0

[14]   B. H. Kear, “Sintering and Microstructure of Nanophase WC/Co Hardmetals,” Journal of Materials Processing Technology, Vol. 63, No. 1-3, 1997, pp. 317-321. doi:10.1016/S0924-0136(96)02748-3

[15]   P. Seegopaul, L. E. McCandlish and F. M. Shinneman, “Production Capability and Powder Processing Methods for Nanostructured WC-Co Powder,” International Jour nal of Refractory Metals and Hard Material, Vol. 15, No. 1-3, 1997, pp. 133-138. doi:10.1016/S0263-4368(96)00044-3

[16]   L. Dong-Won, T. Farkhod, K. Ju-Hyeong and Y. Ming Chuan, “Fabrication of Ultrafine Tungsten-Based Alloy Powders by Novel Soda Reduction Process,” Materials Research Bulletin, Vol. 45, No. 3, 2010, pp. 348-351. doi:10.1016/j.materresbull.2009.12.005

[17]   Z. W. Zhang, G. L. Chen, G. Chen and J. E. Zhou, “Amor phization and Thermal Stability of Mechanical Alloyed W-Ni-Fe,” Materials Science and Engineering: A, Vol. 41, No. 7, 2006, pp. 34-39. doi:10.1016/j.msea.2005.06.080

[18]   Z. W. Zhang, J. E. Zhou, S. Q. Xi, G. Ran and P. L. Li, “Phase Transformation and Thermal Stability of Me chanically Alloyed W-Ni-Fe Composite Materials,” Ma terials Science and Engineering: A, Vol. 379, No. 1-2, 2004, pp. 148-53. doi:10.1016/j.msea.2004.02.039

[19]   Z. W. Zhang, J. E. Zhou, S. Q. Xi, G. Ran, P. L. Li and W. X. Zhang, “Formation of Crystalline and Amorphous Solid Solutions of W-Ni-Fe Powder during Mechanical Alloying,” Journal of Alloys and Compounds, Vol. 370, No. 1-2, 2004, pp. 186-191. doi:10.1016/j.jallcom.2003.09.012

[20]   Z. G. Liu, L. Lu and M. O. Lai, “Synthesis of Nanocrystalline Carbide in Tungsten Alloy by Mechanical Alloying and Annealing,” Journal of Alloys and Compounds, Vol. 394, No. 1-2, 2005, pp. 176-180. doi:10.1016/j.jallcom.2004.10.027

[21]   J. S. C. Jang, J. C. Fwu and L. J. Chang, “Study on the Solid-Phase Sintering of the Nano-Structured Heavy Tungsten Alloy Powder,” Journal of Alloys and Com pounds, Vol. 434-435, 2007, pp. 367-370. doi:10.1016/j.jallcom.2006.08.215

[22]   G. O. Bahig, “Effect of Various Binder Metals on Tungsten Properties,” M.Sc. Thesis, Cairo University, Giza, 2006.

[23]   D. L. Deborah Chung, “Applied Materials Science, Application of Engineering Materials in Structural, Electronics, Thermal and Other Industries,” Chapman and Hall CRC., 2001.

[24]   E. Lassner and W. D. Schubert, “Tungsten; Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds,” Kluwer Academic/Pienum Publishers, New York, 1998.

[25]   R. Malewar, K. S. Kumar, B. S. Murty, B. Sarma and S. K. Pabi, “On Sinterability of Nanostructured W Produced by High-Energy Ball Milling,” Journal of Materials Research, Vol. 22, No. 5, 2007, pp. 1200-1206. doi:10.1557/jmr.2007.0166

[26]   J. L. Johnson, “Progress in Processing Nanoscale Refractory and Hardmetal Powders,” Proceeding of International Conference on Tungsten Refractory & Hardmetals VII, Vol. 5, No. 57, 2008, pp. 5-71.

[27]   H. Wang, Z. Fang and D. Siddle, “Study of Size-De pendent Sintering Behavior of Tungsten Powders,” In: Tungsten, Refractory & Hardmetals VII, Metal Powder Industries Federation, Princeton, 2008, pp. 5-72.

[28]   N. M. Hwany, Y. J. Park, D.-Y. Kim and D. Y. Yoon, “Activated Sintering of Nickel-Doped Tungsten: Ap proach by Grain Boundary Structural Tramsition,” Scri pta Materialia, Vol. 42, No. 5, 2002, pp. 422-428.