The formation of amorphous and crystalline state of the Nd2Fe23B3 alloy from melt-spun ribbon is presented. The synthesis conditions are investigated combining DSC, X-ray diffraction and thermomagnetic analysis. The thermomagnetic analysis is found to be very useful to optimize the synthesis process. Comparison of these results enables to discuss the thermal stability of both the amorphous and ...

The effect of partial replacement of Fe by Co (up to 8 %) on thermal stability, structure and magnetic properties of FeNbBCu alloys has been explored in this paper. The results indicate that Co reduces the stability against crystallization of the amorphous alloy and stabilizes the nanocrystalline phase prior to the further precipitation of metastable boride phases. Transmission Mössbauer spectr...

Usually metals and alloys are in a crystalline state. However, metallic glasses ( amorphous metals ) can be obtained from certain alloys with the right composition, when they are quenched from the liquid state at a high enough cooling rate. Since their discovery in 1960, amorphous metals or metallic glasses have been developed from binary systems of micron size (ribbons and powders) to multi-co...

Pressure dependknce of XAC (T) for amorphous Fe,Laloo-, has been measured up to 20 kbar. With increasing pressure, the ferromagnetic phase for x = 87.5 reduces and finally the spin-glass state is realized below 110 K. Paramagnetic to spin-glass transition temperature observed for x = 92.5 becomes low by applying pressure. Spin-glass behavior has been observed in Fe-rich amorphous alloy systems ...

Phase transformations in the supercooled liquid region (between T, and T,,,), prior to the onset of crystallization, in amorphous Pd-Ni-P alloys remain controversial. It has been previously proposed that the amorphous alloy decomposes into two amorphous phases prior to the crystallization reaction when annealed in the supercooled liquid region. Investigations by DSC, Mossbauer spectroscopy, X-r...

There is shift in trend towards the use of high quality polymers as the base material in manufacturing microfluidic chips. In this paper, an amorphous metallic alloy mold insert was used in a micro injection-molding process to fabricate microfluidic features onto cyclic-olefin-copolymer (COC) material. The insert and fabricated samples were compared in terms of the geometry and surface roughnes...

The Barkhausen pattern from the amorphous alloy Fe21Co64B15 showed high sweep-to-sweep reproducibility for most sweeps when driven slowly over a minor hysteresis loop. Small changes in the maximum applied field led to completely different pulse patterns. When driven near saturation the sweep-to-sweep reproducibility was lost. Large features observed on rapid sweeps were also reproducible, but n...

We use molecular dynamics simulations to show that glass transition in a model phase separating amorphous alloy, Cu(50)Nb(50), occurs by gelation. At the glass transition, a mechanically stiff, percolating network of atoms with icosahedral local packing forms at the interfaces between compositionally enriched regions. This low-energy network halts coarsening of the phase-separated structure and...