Nanokristal Co70Si15B15 Toz Alaşımların Yapısal, Termal ve Manyetik Özelliklerinin İncelenmesi

Yıl 2019, Cilt: 23 Sayı: 1, 83 - 89, 01.04.2019

Barış Avar

https://doi.org/10.19113/sdufenbed.447300

Cited By: 4

Öz

Bu
çalışmada nanokristal Co₇₀Si₁₅B₁₅ (at.%) toz
alaşımları, mekanik alaşımlama (MA) tekniği ile farklı öğütme sürelerinde
üretilmiştir. Öğütme süresince alaşımların yapısal değişimleri, parçacık
morfolojisi, termal kararlılıkları ve manyetik özellikleri incelenmiştir. X-ışını
difraksiyonu (XRD) sonuçları, elementel tozların birbirleri ile olan reaksiyonu
sonucu nanokristal Co(Si,B) katı çözelti fazını oluşturduğunu göstermiştir.
Taramalı elektron mikroskobu (SEM) analizlerinden morfolojinin alaşımlama
boyunca değiştiği ve parçacık boyutunun öğütmenin ilk safhalarında arttığı,
daha sonra küçüldüğü anlaşılmıştır. Alaşımların yapısal durumuna bağlı olarak
görülen ekzotermik reaksiyonun aktivasyon enerjisi 128 ± 3 kJ/mol olarak
hesaplanmıştır. Manyetik sonuçlar, artan öğütme süresiyle hem doyum
manyetizasyonunun (M_s) hem de koersivitenin (H_c)
azaldığını göstermiştir.    

Anahtar Kelimeler

Mekanik alaşımlama, Co-Si-B alaşımı, Yapısal analiz, Termal kararlılık, Manyetik özellikler

Investigation of Structural, Thermal and Magnetic Properties of Nanocrystalline Co70Si15B15 Powder Alloys

Öz

In
this research, nanocrystalline Co₇₀Si₁₅B₁₅
(at.%) powder alloys were prepared by mechanical alloying (MA) technique at
various milling times. Their structural changes, particles morphology, thermal
stability and magnetic properties through the milling process were
investigated. The X-ray diffraction (XRD) results showed that reaction of the
elemental powders mixture resulted in the formation of the nanocrystalline
Co(Si,B) solid solution phase. According to the scanning electron microscopy
(SEM) analysis, particle morphology was changed during alloying and the
particle size increased initially, then decreased. Depending on the structural
state of the alloys, the apparent activation energy of the exothermic reaction
was calculated as 128 ± 3 kJ/mol. Magnetic results indicated that both
saturation magnetization (M_s) and coercivity (H_c) were
decreased with increasing milling time.    

Anahtar Kelimeler

Mechanical alloying, Co-Si-B alloy, Structural analysis, Thermal stability, Magnetic properties

Kaynakça

• [1] McHenry, M. E., Willard, M. A., Laughlin, D. E. 1999. Amorphous and nanocrystalline materials for applications as soft magnets, Progress in Materials Science, 44(4), 291-433.
• [2] Suryanarayana, C., Ivanov, E., Boldyrev, V. V. 2001. The science and technology of mechanical alloying, Materials Science and Engineering A, 304, 151-158.
• [3] Prasad, N. K., Agrawal, K. M., Ranwa, J. R., Meena, S. S., Yusuf, S. M., Mukhopadhyay, N. K. 2017. The effect of Mn on the structural and magnetic behaviour of Fe-6Si-8B alloy produced by high energy ball Milling, Transactions of the Indian Institute of Metals, 70(6), 1431-1436.
• [4] Koch, C. C. 1993. The synthesis and structure of nanocrystalline materials produced by mechanical attrition: a review, Nanostructured Materials, 2(2), 109-129.
• [5] Suryanarayana, C. 2004. Mechanical Alloying and Milling. Marcel Dekker, New York, 466s.
• [6] Avar, B. 2012. Nanoyapılı metalik alaşımlar. Kahramanmaraş Sütçü İmam Üniversitesi, Fen Bilimleri Enstitüsü, Doktora Tezi, 205s, Kahramanmaraş.
• [7] Avar, B. 2016. Structural, thermal and magnetic characterization of nanocrystalline Co65Ti25W5B5 powders prepared by mechanical alloying, Journal of Non-Crystalline Solids, 432, 246-253.
• [8] Taghvaei, A. H., Khoshrodi, A. M. 2018. Characterization, thermodynamic analysis and magnetic investigation of new soft magnetic amorphous/nanocrystalline Co50Fe21Ti19Ta5B5 powders produced by mechanical alloying, Journal of Alloys Compounds, 742, 887-896.
• [9] Matyja, H., Oleszak, D., Latuch, J. 1992. Ball miling of Co-Fe-Si-B alloys, Materials Science Forum, 88, 297-304.
• [10] Pekala, M., Jachimowicz, M., Fadeeva, V. I., Matyja, H. 2001. Phase transformations in Co-B-Si alloys induced by high-energy ball milling, Journal of Non-Crystalline Solids, 287, 360-365.
• [11] Bednarcik, J., Kovac, J., Kollar, P., Roth, S., Sovak, P., Balcerski, J., Polanski, K., Svec, T. 2004. Crystallization of CoFeSiB metallic glass induced by long-time ball milling, Journal of Non-Crystalline Solids, 337, 42-47.
• [12] Li, H. F., Ramanujan, R. V. 2004. Mechanical alloying of Co-Si-B based amorphous magnetic alloys. International Conference on Materials Processing for Properties and Performance, Singapur, 415-424.
• [13] Muhgalin, V. V., Dorofeev, G. A., Eremina, M. A., Lad'yanov, V. I., Sapegina, I. V. 2011. Nanocrystallization of the amorphous Co-B-Si alloys formed by melt spinning and mechanical alloying, The Physics of Metals and Metallography, 112(6), 596-602.
• [14] Corrias, A., Ennas, G., Marongiu, G., Musinu, A. N. N. A., Paschina, G. 1992. Structural evolution in mechanical alloying of Co and B powders, Journal of Non-Crystalline Solids, 150(1-3), 487-490.
• [15] Neamtu, B. V., Chicinas, H. F., Marinca, T. F., Isnard, O., Chicinas, I. 2016. Preparation and characterisation of Co-Fe-Ni-M-Si-B (M = Zr, Ti) amorphous powders by wet mechanical alloying, Journal of Alloys Compounds, 673, 80-85.
• [16] Raanaei, H., Fakhraee, M. 2017. Synthesis and characterization of nanocrystalline Co-Fe-Nb-Ta-B alloy, Journal of Magnetism and Magnetic Materials, 438, 144-151.
• [17] Kittel, C. 2004. Introduction to Solid State Physics. Wiley, New York, 704s.
• [18] Loudjani, N., Bensebaa, N., Dekhil, L., Alleg, S., Sunol, J. J. 2011. Structural and magnetic properties of Co50Ni50 powder mixtures, Journal of Magnetism and Magnetic Materials, 323(23), 3063-3070.
• [19] Yekta, EB., Taghvaei, A. H., Sharafi, S. 2018. The effect of metalloid content on glass forming ability, thermal stability and magnetic properties of Fe-Ta-Si-C powders prepared by mechanical alloying, Journal of Non-Crystalline Solids, (baskıda).
• [20] Kissinger, H. E. 1956. Variation of peak temperature with heating rate in differential thermal analysis, Journal of Research of the National Bureau of Standards, 57, 217-221.
• [21] Bensebaa, Z., Bouzabata, B., Otmani, A., Djekoun, A., Kihal, A., Greneche, J. M. 2010. Characterization of nanocrystalline FeSiCr powders prepared by ball milling, Journal of Magnetism and Magnetic Materials, 322(15), 2099-2103.
• [22] Tarigan, K., Sebayang, D., Yu, S. C., Yang, D. S. 2018. Local structure and magnetic properties of Fe50Cr40Si10 nanocrystalline alloys, IOP Conference Series: Materials Science and Engineering, 343, 012008.