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    Effect of mechanical alloying on FeCrC reinforced Ni alloys
    (Carl Hanser Verlag, 2016) Yılmaz, Serdar Osman; Teker, Tanju; Demir, Fatih
    Mechanical alloying (MA) is a powder metallurgy processing technique involving cold welding, fracturing and rewelding of powder particles in a high-energy ball mill. In the present study, the intermetallic matrix composites (IMCs) of Ni-Al reinforced by M7C3 were produced by powder metallurgical routes via solid state reaction of Ni, Al and M7C3 particulates by mechanical alloying processes. Ni, Al and M7C3 powders having 100 mu m were mixed, mechanical alloyed and the compacts were combusted in a furnace. The mechanically alloyed (MAed) powders were investigated by X-ray diffraction (XRD), microhardness measurement, optic microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The presence of the carbides depressed the formation of unwanted NiAl intermetallic phases. The mechanical alloyed M7C3 particles were unstable and decomposed partially within the matrix during alloying and sintering, and the morphology of the composites changed with the dissolution ratio of M7C3 and sintering temperature.
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    Sliding wear behavior of FeCrC reinforced and Ni-based composites produced by mechanical alloying technique
    (Redakcia Kovove Materialy, 2018) Yılmaz, Serdar Osman; Demir, Fatih; Teker, Tanju
    The study presents the behavior of FeCrC particulates reinforced and Ni-based composites produced by a mechanical alloying process in the presence of friction and wear. Ni, Al and M7C3 powders having 100 mu m size were mixed, mechanically alloyed and the compacts were sintered in an atmosphere controlled furnace. The mechanically alloyed (MAed) samples were investigated by SEM, EDS and DTA. For the wear tests, the samples were tested in dry conditions. The worn surfaces were examined using OM to study the wear behavior. The friction coefficient was recorded continuously during the wear test and wear rate. The highest wear rate was obtained at 800 degrees C, and the lowest was obtained at 900 degrees C. With the increase of reinforcement amount, wear rate decreased.