Devitrification and Nano-Crystalline/Amorphous Composite Formation in Ni₆₄Cu₉Fe₈P₁₉ Glassy Alloy at Elevated Temperatures

Abstract:

The Ni64Cu9Fe8P19 alloy was prepared using 99.95 wt % Ni, 99.95 wt % Cu, 99.95 wt % Fe and Ni-P master alloy. The melt spun ribbon in as-cast state was characterized using of transmission electron microscope (TEM) and X-ray diffraction (XRD). The amorphous alloy was subjected to DTA and resistivity measurement in order to determine the thermal stability at elevated temperatures. The melt spun ribbon had a negative TCR=-2.23·10-6K-1 that is stable up to the Tg-dep=511K. At higher temperature Tg-int=560K the relative resistance starts to decrease and between 573K and 591K the rate of the decrease reaches TRC=-480.096 K-1. After the heating cycle to 633K, during cooling the alloy has a positive TRC=6.03·105 K-1. DTA curve presents the three exothermal stages with the onsets and peak values at I: Tx1=564K and T1=611K, II: Tx2=655K and T2=662K, III: Tx3=697K and T3=715K, respectively. The melting stage can be characterized by endothermic peak with Tm=1149K and Tl=1174K. On the base of the measurements the amorphous alloy was heated to the temperatures where subsequent transformations occurred. TEM study delivered information about formation of the M3P type tetragonal phosphide (a=9.040Å, c=4.462Å) nanocrystals within the amorphous matrix after the first stage of crystallization.

• Periodical: Solid State Phenomena (Volume 130)
• Pages: 167-170
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.130.167
• Online since: December 2007
• Authors: Krzysztof Ziewiec, Józef Lelątko, Paweł Pączkowski, Krzysztof Bryła
• Keywords: Crystallization, Glass Forming Ability (GFA), Melt-Spinning, Metallic Glass, Thermal Stability

References

[1] H. Warlimont, Materials Science and Engineering A304-306, 2001, 61-61.

[2] T. Masumoto, Materials Science and Engineering A181-182, 1994, 8.

[3] T. Kulik, Journal of Non-Crystalline Solids 287, 2001, 145-161.

[4] K. Ziewiec, P. Olszewski, R. Gajerski, S. Kąc, A. Ziewiec, Z. Kędzierski, Journal of NonCrystalline Solids, 343, 2004, 150-153.

DOI: 10.1016/j.jnoncrysol.2004.07.055

[5] J. Guo, F. Zu, Z. Chen, S. Zheng, Y. Yuan, Solid State Communications, 315, 2005, 103-107.

[6] R. Tamura, K. Komatsu, S. Takeuchi, Proceedingst of the 22nd Risø International Symposium on Materials Science: Science of Metastable and Nanocrystalline Alloys Structure, Properties and Modelling, Editors: A.R. Dinesen, M. Eldrup D. Juul Jensen S. Linderoth, T.B. Pedersen, N.H. Pryds, A. Schrøder Pedersen, J.A. Wert, Risø National Laboratory, Roskilde, Denmark (2001).

[7] O. Haruyama, H. Kimura, N. Nishiyama, A. Inoue, Journal of Non-Crystalline Solids 250-252, 1999, 781-785.

DOI: 10.1016/s0022-3093(99)00178-7

[8] K. Ziewiec, K. Bryła, A. Błachowski, K. Ruebenbauer, and J. Przewoźnik, Journal of Alloys and Compounds, in press.