Nanocrystalline ~NC! ferrite powders have been synthesized using a 50 kW–3 MHz rf thermal plasma torch for high-frequency soft magnet applications. A mixed powder of Ni and Fe (Ni:Fe 51:2), a NiFe permalloy powder with additional Fe powder (Ni:Fe51:2), and a NiFe permalloy powder (Ni:Fe51:1) were used as precursors for synthesis. Airflow into the reactor chamber was the source of oxygen for oxi...

Solute clustering and partitioning behavior in the early crystallization stage of an Fe73.5Si13.5B9Nb3Cu1 amorphous alloy have been studied by employing a three dimensional atom probe (3DAP) and a high resolution electron microscope (HREM). 3DAP results have clearly shown that Cu atom clusters are present in the amorphous state after annealing below the crystallization temperature. The density ...

A directional solidification technique was developed and applied to the problem of fractional crystallization of an iron meteorite parent body. Samples of Fe-Ni alloys close to meteorite compositions and containing S, P, and C were made. The solidified structures contain secondary phases such as sulphides within the proeutectic single crystal austenite (taenite). As a result of these experiment...

Abstract The effects of Ti and Si addition on the phase equilibrium mechanical properties equiatomic CoCrFeMnNi high entropy alloy (Cantor alloy) were investigated. at 1000 °C was determined from result X-ray diffraction electron probe micro-analysis. stabilizes $$\sigma$$ σ phase, A12 C14-Laves while A13 pha...

Introduction: Ureilites are ultramafic, carbon-rich achondrite meteorites, which are believed to represent mantle residues from the ureilite parent body (UPB). Approximately 1015% are polymict (brecciated) ureilites, which contain many exotic lithic and mineral clasts [e.g. 1,2]. Whether metal and sulphide phases in ureilites are indigenous to the UPB or foreign (i.e. impact-derived) is highly ...