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Khalifa, W., and S. El-Hadad, "ULTRASONICATION EFFECTS ON THE MICROSTRUCTURE CHARACTERISTICS OF THE A380 DIE CAST ALLOY", International Journal of Metalcasting, vol. 13, issue 4, pp. 865-879, 2019. ultrasonicationijmc.pdf
Khalifa, W., Y. Tsunekawa, and M. Okumiya, "Ultrasonic Grain Refining Effects in AC4CH Al-Si Cast Alloy", Symposium on the Sustainable Mechanical System, Toyota Technological Institute, Nagoya, Japan, December 4th, 2009.
Khalifa, W., Y. Tsunekawa, and M. Okumiya, "Ultrasonic Grain Refining Effects in A356 Al-Si Cast Alloy", Transactions of the American Foundry Society, pp. 91-98, 2010.
El-Hadad, S., M. Ibrahim, M. Mourad, and W. Khalifa, "Ultrasonic Detection of Microstructure Features in Ti-Alloyed Ductile Iron", Trans Indian Inst Met, vol. 72, issue 9, pp. 2349–2358, 2019. ultrasonic_detectindian.pdf
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Khalifa, W., Y. Tsunekawa, and M. Okumiya, "Thixocasting of AC4CH Alloy Billets Prepared by Ultrasonic Treatment", the 2nd International Symposium on Advanced Plasma Science and Its Applications for Nitrides and Nanomaterials (ISPlasma2010), Meijo University, Nagoya, Japan, March 7-10, 2010.
Khalifa, W., "Thermal Analysis of Grain Refining in A319 Alloys", Light Metals, Los Angelos, TMS, pp. 1027-1034, 2017.
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El-Hadad, S., W. Khalifa, and A. Nofal, "Surface modification of investment cast-316L implants: Microstructure effects", Materials Science and Engineering: C, vol. 48, issue 3, pp. 320-327, 2015.
Okumiya, M., M. Yoshida, R. Ichiki, K. W. C. Tekmen, and T. K. Y. Tsunekawa, "Surface Modification of Aluminum Using a Combined Technique of Barrel Nitriding and Plasma Nitriding", journal of Plasma Process and Polymers, vol. 6, pp. S287–S290, 2009.
M. Okumiya, R. Ichiki, C. Tekmen, W. Khalifa, and T. K. Y. Tsunekawa, "Surface Modification of Aluminum Using a Combined Technique of Barrel Nitriding and Plasma Nitriding", The Eleventh International Conference on Plasma Surface Engineering (PSE2008), Garmisch-Partenkirchen, Germany , 2008.
M. Okumiya, M. Yoshida, R. Ichiki, Y.Tsunekawa, and T. M. and W. Khalifa, "Surface Modification of Aluminum Alloy Using a Barrel Nitriding", Fourth International Conference on Advances and Trends in Engineering Materials and Their Applications, AES-ATEMA’2009, Hamburg, Ger, Hamburg, Germany, AES, 2009.
Zaki, A., S. El-hadad, and KHALIFA, A. M., "Surface modification effects on microstructure and mechanical properties of bio-titanium alloys", Materials Science Forum, vol. 909, issue -, Tokyo Japan, Trans Tech Publications, Switzerland, pp. 199-204, 2017.
El-Aziz, A. M., W. Khalifa, H. Ahmed, and S. El-Taweel, "Structure and Corrosion Behaviour of Dissimilar Steel Weldments in Acid Media", German - Egyptian Year of Science & Technology, Materials Science Workshop, on Materials Based Manufacturing Technologies, CMRDI, Helwan, Cairo, Egypt., 7-9 May 2007.
Abdel-Aziz, A., W. Khalifa, H. Ahmed, and S. El-Taweel, "Structure and Corrosion Behavior of Dissimilar Steel Weldments in Acid Media", Corrosion Protection, vol. 49, issue 11, pp. 275-81, 2006.
MOUSSA, M. E., S. El-hadad, and W. Khalifa‏, "Strengthening Effect of Y 2 O 3 on AZ92 Magnesium Alloy Using Stir Casting Process‏", International Journal of Metalcasting, vol. 15, issue 3, pp. 818-828, 2021.
El-Aziz, A., D. S. Raid, and W. Khalifa, "Stability and corrosion behavior of A356 Al-Si alloy treated by high intensity ultrasonic vibrations", 14th All-Polish Corrosion Symposium-“New Achievements in Corrosion Research and Engineering”- 327th Event of the European Federation of Corrosion, Jastrząb/Poraj (near Czestochowa) Poland, 25th - 27th Nov., 2009.
El-Aziz, A., D. S. Raid, and W. Khalifa, "Stability and corrosion behavior of A356 Al-Si alloy treated by high intensity ultrasonic vibrations", journal of Corrosion Protection, vol. vol. 52, issue No.11, pp. pp. 569, 2009.
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Khalifa, W., F. H. SAMUEL, J. E. Gruzleski, and V. S. and H.W. Doty, "Role of Inclusions in the Nucleation of Fe-Intermetallic Phases in the Al-Si-Fe Alloys", Proc. 12th Arab International Aluminum Conference (Arabal-2006), Sharm El-Sheikh – Egypt, The Aluminum Company of Egypt (Egyptalum), pp. pp.257-80, 2006.
El-Mahallawi, I., W. Khalifa, A. Shash, and N. Aref, "Roadmap to Egyptian Casting Industry: Material Technology", International Conference on Industry Academia Collaboration, Cairo, Egypt, 6-8 April 2015.
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Khalifa, W., and Y. Tsunekawa, "Production of Grain-Refined Billets of the AC7A Al-Mg Alloy via Solidification in Ultrasonic Field", Transactions of Nonferrous Metals Society of China, vol. 26, issue 5, pp. 930−937, 2016.
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Moustafa, T., W. Khalifa, R. M. El-Koussy, and N. A. El-Reheem, "Optimizing theWelding Parameters of Reinforcing Steel Bars", Arab J Sci Eng, vol. 41, issue 5, pp. 1699–1711, 2016.
El-hadad, S., M. Ghaith, A. Yassin, M. Kamal‏, and W. Khalifa, "Optimizing the Surface Treatment Processes to Enhance the Bioactivity of Ti–6Al–7Nb Alloy", Transactions of the Indian Institute of Metals 73 ‏, vol. 73, issue 11, pp. 2727-2738, 2020.
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and W. Khalifa, F. Samuel, G. J., "Nucleation of Solid Aluminum on Inclusion Particles Injected into Al-Si-Fe Alloys", Metallurgical and Materials Transactions A, vol. 35A, pp. 3233-3250, 2004.
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