Solidification behaviour of bulk glass-forming alloy systems

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 essential parameters for high hulk- glass forming ability.
Journal of Alloys and Compounds


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 behavior, glass forming ability and thermal characteristics of soft magnetic Fe-Co-B-Si-Nb-Cu bulk amorphous alloys
AYKOL, Muratahan; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (2011-09-01)
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...
Pyrolysis of poly(phenylene vinylene)s with polycaprolactone side chains
Nur, Yusuf; Çolak, Demet; Cianga, Ioan; Yagci, Yusuf; Hacaloğlu, Jale (2008-05-01)
The thermal degradation characteristics of a new macromonomer poly(epsilon-caprolactone) with central 4,4'-dicarbaldehyde terphenyl moieties and poly(phenylene vinylene)s with well defined (E-caprolactone), (PPV/PCL) as lateral substituents were investigated via direct pyrolysis mass spectrometry. The unexpectedly high thermal stability of the macromonomer was attributed to intermolecular acetylation of benzaldehyde yielding a hemiacetal and causing a crosslinked structure during the pyrolysis. Increased th...
Thermal degradation of polystyrene composites. Part II. The effect of nanoclay
KAYA, Hatice; Kaynak, Cevdet; Hacaloğlu, Jale (2016-07-01)
In this work, thermal degradation behavior polystyrene/organoclay nanocomposites containing tribromophenol end-capped brominated epoxy oligomer, (BE) with or without Sb2O3 were investigated systematically via direct pyrolysis mass spectrometry. Incorporation of organically modified montmorillonite into polystyrene, (PS) matrix not only increased thermal stability but also the probability of radical recombination, disproportionation and carbonization reactions causing increase in the char yield. Exfoliation ...
Erkoç, Şakir (Wiley, 1990-09-01)
The structural stability and energetics of microclusters containing 3 to 7 atoms of f.c.c. metal elements are investigated. A recently developed empirical many‐body potential function (PEF) is used in the calculations, which comprises two‐ and threebody atomic interactions. The PEF satisfies both, bulk cohesive energy and stability condition. It is found that the energetically most stable structures of microclusters are in compact form.
Citation Formats
M. V. Akdeniz and A. Mehrabov, “Solidification behaviour of bulk glass-forming alloy systems,” Journal of Alloys and Compounds, pp. 185–191, 2005, Accessed: 00, 2020. [Online]. Available: