Solidification behavior, glass forming ability and thermal characteristics of soft magnetic Fe-Co-B-Si-Nb-Cu bulk amorphous alloys

The effect of varying Cu content on the bulk glass forming ability (GFA) of (Fe(0.36)Co(0.36)B(0.192)Si-(0.048)Nb(0.04))(100-X)Cu(X) alloys (X = 0, 0.5, 0.75 and 1.0) is revealed by investigating the thermal behaviors and phase competitions upon solidification. The changes in GFA are interpreted in terms of suppression of consecutive solidification reactions via microstructural and thermal features. Instead of the type of the primary crystallization product originating from the prevalent atomic order in the glass or supercooled liquid, precipitation of faceted binary and higher-order pro-eutectic compounds such as (Fe,Co)(2)B and (Fe,Co)NbB from the alloy melt and resulting skewed eutectic coupled zone are correlated with the observed GFA. With the employed centrifugal casting method, the (Fe(0.36)Co(0.36)B(0.192)-Si(0.048)Nb(0.04))(99.25)Cu(0.75) alloy shows the largest critical thickness of 3 mm and the best soft magnetic properties such as 1.58 T saturation magnetization intensity and 11.7 A/m coercivity after annealing.


Solidification and crystallization behaviour of bulk glass forming alloys
Aybar, Sultan; Akdeniz, Mahmut Vedat; Department of Metallurgical and Materials Engineering (2007)
The aim of the study was to investigate the crystallization kinetics and solidification behaviour of Fe60Co8Mo5Zr10W2B15 bulk glass forming alloy. The solidification behaviour in near-equilibrium and non-equilibrium cooling conditions was studied. The eutectic and peritectic reactions were found to exist in the solidification sequence of the alloy. The bulk metallic glass formation was achieved by using two methods: quenching from the liquid state and quenching from the semi-state. Scanning electron microsc...
Solidification behaviour of bulk glass-forming alloy systems
Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (Elsevier BV, 2005-1)
The solidification behaviour and resultant microstructures of bulk glass forming ferrous (Fe60CoSZr10Mo5W2B15) and non-ferrous (Zr65Al10Ni10Cu15) alloy systems have been investigated. It was shown that the suppression of the eutectic reaction during solidification ultimately leads to the formation of an amorphous structure. The characteristic DSC pattern of melting involving a sequence of eutectic and pefitectic like reactions with a high inapitude of reaction enthalpies ratio (AHp/AH,). appear to be essent...
Glass Forming Ability and Magnetic Properties of Fe36Ni36B19.2Si4.8Nb4-xMx (M = Cu, Zr, Ti, Y, Pt) Bulk Glassy Alloys Fabricated by Suction Casting
Kirimli, Handan Engin; Sarlar, Kagan; Konuk, A. Oguz; DUMAN, Nagehan; Akdeniz, Mahmut Vedat; Kucuk, Ilker (2013-05-01)
In this study, the effects of Cu, Zr, Ti, Y, Pt substitution for Nb additions on the stability and magnetic properties of Fe-Ni-based bulk metallic glass (BMG) alloys fabricated by the suction casting method are investigated. The saturation magnetization (J(s)) and coercivity (H-c) for as-cast Fe36Ni36B19.2Si4.8Nb4-xMx (M = Cu, Ti) BMG alloys were in the range of 0.51 T-0.55 T and 76-779 A/m, respectively. Differential scanning calorimetry curves show that the Fe36Ni36B19.2Si4.8Nb4-xMx (M = Cu, Ti) bulk met...
Magnetic monitoring approach to nanocrystallization kinetics in Fe-based bulk amorphous alloy
Duman, Nagehan; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (2013-12-01)
Much of the recent metallic glass research is devoted to controlling the crystallization of amorphous precursors with the purpose of obtaining amorphous matrix nanocrystalline alloys which combine unmatched soft magnetic properties with good mechanical properties. Therefore, it is crucial to have better understanding of crystallization mechanisms and thermal dependence of nanocrystals that are formed by annealing. This study deals with the nanociystallization kinetics of Cu-modified Fe-Co-Ni-B-Si-Nb bulk am...
Thermal characterization of dolomites
Kök, Mustafa Verşan (2001-01-01)
The decomposition behaviour of dolomite samples has been carried out by simultaneous DTA-TG experiments. Dolomite samples could be classified broadly into two categories as regular and iron-bearing dolomites based on DTA decomposition temperatures. The mass% FeO of all the dolomite samples was identified by DTA and the results are confirmed by atomic absorption spectrophotometer experiments.
Citation Formats
M. AYKOL, M. V. Akdeniz, and A. Mehrabov, “Solidification behavior, glass forming ability and thermal characteristics of soft magnetic Fe-Co-B-Si-Nb-Cu bulk amorphous alloys,” INTERMETALLICS, pp. 1330–1337, 2011, Accessed: 00, 2020. [Online]. Available: