Characterization and Synthesis of Co (ss) /WSi 2 -CoWSi Nanocomposite by Mechanical Alloying and Subsequent Sintering
作者： M. Zarezadeh Mehrizi , M. Shamanian , A. Saidi
DOI: 10.1007/S11665-013-0792-8
关键词:
摘要: In this study, Co(ss)/WSi2-CoWSi nanocomposite was synthesized via mechanical alloying and heat treatment. order to fabricate bulk composite, 50-h-milled powders were cold pressed subsequently sintered at 1150 °C for 4 h in Ar atmosphere. Phase development structural changes investigated by x-ray diffraction technique scanning electron microscopy. After various milling times, the differential thermal analysis microhardness measurements. The starting powder mixture has two allotropic structures of Co (fcc hcp). 10-h milling, an transformation takes place hcp), a composite microstructure consisting cold-welded Co, W, Si phases is formed. 20 h, new peaks related WSi2 appeared diffractograms. Increasing time 50 caused formation (Co, Si) solid solution, WSi2, CoWSi phases. DTA 30- confirmed increase degree ordering. exhibited high value about 1050 HV0.1. XRD result material demonstrated that only ordered nanostructured present. Consolidated sample showed 12% porosity. Nanoindentation results hardness 700 HV0.1 with elastic modulus 107 GPa.
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