The devitrification of the Fe65Nb10B25 and Fe70Nb10B20 metallic glasses produced by melt spinning has been studied by calorimetry (DSC), X-ray diffraction (XRD) and transmission Mössbauer spectroscopy (TMS). Calorimetric measurements show three exothermic peaks which have been identified as the successive primary nanocrystallization of mainly a Fe23B6-type phase, the formation of bcc-Fe and met...

Amorphous Fe80-xRxB20 alloys (with R=Pr, Nd, Sm, Gd, Dy, Ho, Er and Tm ) have been prepared by melt spinning and their magnetic properties have been studied. The Gd moment at 4.2 K is found to be 7μB which agrees with the theoretical value indicating a collinear spin structure. The moments of the other rare-earth are lower than the theoretical value, implying a conical spin structure. The mean-...

Mn54Al44C2 forms the metastable L10 intermetallic compound, and exhibits ferromagnetic behavior after appropriate heat treatment. This material offers a low-cost, lightweight alternative to rare earth, alnico and ferrite magnets currently in use. Characterization techniques include vibrating sample magnetometry (VSM), X-Ray diffraction (XRD), optical microscopy and transmission electron microsc...

Melt spinning of polypropylene fibers containing silver and zinc nanoparticles was investigated. The nanometals were generally uniformly dispersed in polypropylene, but aggregation of these materials was observed on fiber surface and in fiber cross-sections. The mechanical properties of the resulted composite fibers with low concentration of nanometal were comparable to those for the control P...

(Fe100-xVx)75P15C10 (x = 0, 5, 10 and 15) amorphous alloys in the form of ribbon were prepared by the standard melt spinning technique and studied their transport and magnetic properties. The resistivity follows ‘Mooij correlation’ at low temperature (300 93) K. The Hall resistivity and the magnetoresistance (MR) were measured in an applied magnetic field up to 0.6T at room temperature (RT = 30...

2014 Fe74.7Cr3.8P8.7C10.7Si1.9 amorphous alloy in ribbon shape have been obtained by melt spinning with substrate velocity in the range 20-46 ms-1. Magnetic properties of as-quenched samples are studied by different techniques : the ribbon’s magnetic texture by Mössbauer spectroscopy, the magnetization, coercive field and Curie temperature by investigation of B-H loops at 50 Hz. The experimenta...

A novel photocrosslinkable and melt processible terpolymer precursor for carbon fiber has been successfully synthesized and characterized. The terpolymer was synthesized by an efficient emulsion polymerization route and has a typical composition of acrylonitrile/methyl acrylate/acryloyl benzophenone in the mole ratio, 85/14/1. It has been characterized by FTIR, NMR, intrinsic viscosity and GPC ...

Developing texture in nanocrystalline permanent magnet alloys is of significant importance. Directional annealing is shown to produce texture in the permanent magnet alloy (Sm12Co88)99Nb1. Melt spinning produced isotropic grain structures of the hard magnetic metastable SmCo7 phase, with grain sizes of ∼300 nm. Conventional annealing of melt-spun (Sm12Co88)99Nb1 alloy produced Sm2Co17 phase wit...