اثر آلیاژسازی مکانیکی و عملیات حرارتی بر تغییر فاز مخلوط پودرهای Ni-Cr-Al
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
امیررضا شیرانی
1
(نویسنده)
علی شکوه فر
2
(نویسنده)
محمد حسین عنایتی
3
(نویسنده)
کلید واژه: آلیاژسازی مکانیکی, مواد نانوساختار, ترکیب بین فلزی, CrNiAl,
چکیده مقاله :
در این کار پژوهشی، ترکیبات Ni50Al50 و Ni25Cr25Al50 (at%) مورد آلیاژسازی مکانیکی قرار گرفتند. تغییرات ساختاری ذرات پودر در طول آلیاژسازی مکانیکی به وسیله ی آزمون پراش پرتو ایکس (XRD) بررسی گردید. نتایج حاکی از تشکیل ترکیب بین فلزی نانوکریستال NiAl منظم از ترکیب Ni50Al50 پس از آلیاژسازی مکانیکی و ترکیب بین فلزی نانوکریستال NiCr)Al) از ترکیبNi25Cr25Al50 پس از آلیاژسازی مکانیکی و عملیات حرارتی بود. ریخت شناسی و ریزساختار ذرات پودر با میکروسکوپ الکترونی روبشی (SEM) مشخصه یابی شدند. نتایج نشان داد در مراحل نخستین آلیاژسازی مکانیکی ساختار لایه ای ازNi، Cr و Al تشکیل شده که با ادامه ی فرایند آلیاژسازی، این ساختار به محصول نهایی تغییر فاز داد.
In this study Ni50Al50 and Ni25Cr25Al50 were undergone mechanical alloying and heat treatment. The structural changes of powder particles during processes were studied by X-ray diffraction (XRD). It appeared that there are different phase transformations after both treatments: Ni50Al50 formed a nanocrystalline, orderly NiAl intermetallic compound; on the other hand (NiCr)Al intermetallic which itself was produced from Ni50Cr25Al25. The morphology and cross sectional area of the powder particles were characterized by scanning electron microscopy (SEM). The conclusion was that during initial stages of milling the layers of Cr, Ni, and Al are produced which subsequently are transformed into the final product upon further treatments.
). Albiter, A., Salazar, M., Bedolla, E, Drew, R.A.L. 2003. Microstructure characterization of the NiAl intermetallic compound with Fe, Ga and Mo addition obtained by mechanical alloying. journal of Material Science and enginiering. A. 347: 154-164.
(2). Stoloff, N. S, Liu, C. T , Deevi, S. C., 2000. Emerging applications of intermetallics. Intermetallics. 8: 1313-1320.
(3). Chung-kwei Lin, Shi-Shen Hong, Pee-Yew lee. 2000. Formation of NiAl-Al2O3 intermetallic-matrix composite powders by mechanical alloying technique. Intermetallics. 8: 1043-1048.
(4). Suryanarayana, C, 2001. Mechanical alloying and milling. Progress in material science. 46: 1-184.
(5). Atzmon, M, 1991. Characterization of AlNi formed by a self-sustaining reaction during mechanical alloying. journal of Material Science and enginieering, A. 134: 1326-1329.
(6). Zbiral, J., Jangg, G., Sporer, D and Korb , G. 1992. Influences of heat treatments on the constitution and the recrystallization response of the γ′ - strengthened ODS-Ni-base alloy PM 3030. Scripta Metallurgica et Materialia. 27: 1055-1060.
(7) Mashreghi, A. Moshksar, M. M. 2009. Partial martensitic transformation of nanocrystalline NiAl intermetallic during mechanical alloying. Journal of Alloys and compounds. 482: 196-198.
(8). Enayati, M.H., Karimzadeh, F., Anvari, S.Z. 2008. Synthesis of nanocrystaline NiAl by mechanical alloying. Journal of Material processing and technology. 200: 312-315.
(9). Liu, K.W., Mucklich, F., Pitschke, W., Birringer, R., Wetzig, K. 2001. Formation of nanocrystalline B2-Structured (Ru,Ni)Al in the ternary Ru-Al-Ni system by mechanical alloying and its thermal stability. journal of Material Science and engineering, A, 313: 187-197.
(10). Apachitei, I., Craus, L.M ., Calugaru, GH. 1997. X-ray diffraction study on Ni-Al-Se amorphization by mechanical alloying. Journal of Alloys and compounds, 260: 135-138.
(11). Hung-Hua Sheu, Le-Chun Hsiung, Jiun-Rung Sheu, J. 2009. Synthesis of multiphase intermetallic compounds by mechanical alloying in Ni-Al-Ti system. Journal of Alloys and compound. 469: 483-487.
(12). Williamson, G.K. and Hall, W.H. 1953. X-Ray broadening from field Aluminum and Wulfram. journal of Acta metallurgical. 1: 22-31
(13). Anjelo, L.D., Gonzalez, G., Ochoa, G. 2007. Phase transformation study on Ni75Al25 and Ni50Al50 during mechanical alloying and sintering. Journal of alloys and compounds. 434-435: 348-353.
(14). CHEN, Sh., ZHOU, Y and Li, Y. 1997. Synthesis and Characterization Nanocrystalline Ni-Ti and Ni-Cr powders by mechanical alloying. J. Matr. Sci. Technol.13: 86-90.
_||_