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Processing of materials involving non-equilibrium microstructures and determination of their properties


Materials with non-equilibrium structure and microstructure, which are responsible for novel properties (for example, amorphous structures, microstructures containing metastable phases, including amorphous matrix, nanocrystals and nanoparticles), have as main challenge for their technological use, the development of processes or composition which allow the production of bulk components (of the order of millimetres). The objective of the present project is the development of bulk alloys and composites, using non-equilibrium processing conditions, or processing using non-equilibrium precursors, that is, amorphous, metastable and nanostructured precursors. The following processes will be used to obtain amorphous and nanostructured precursors: high-energy ball-milling (including mechanical alloying, milling and reactive milling) and rapid solidification. The processes of high-energy ball-milling will be used to obtain amorphous or nanometric powders for Al-based systems and for composites systems of the type ceramic-intermetallic and the processes of rapid solidification will be use for the production of amorphous precursors (overspray powder from the process of spray deposition) and for the production of bulk alloys (spray deposition and casting in metallic mould) in the Febased system, as for example Fe-Nb-Zr-B-Cu, Fe-(AI,Ga)-(P,C,B,Si), Fe-(Co,Ni)(Zr,Nb,Ta)-B, Fe-C-Cr-Si-Mo, among others, and Al-based systems as for example Al-Y-Ni-Co, Al-Fe-Nd, Al-Fe-Nd-(Nb,Ni), among others and Zr-based systems, such as Zr-Al-Ni-Cu. Bulk components will be obtained through the consolidation of precursors by pressing followed by sintering or hot-extrusion. Sintering of the nanocrystalline ceramic and metallic powders will involve conventional sintering, liquid-phase sintering, sintering with simultaneous crystallisation or recrystallisation and reactive sintering. Casting in metallic mould will be also used for the nonequilibrium processing in Fe-based, Al-based and Zr-based alloys. The result of these developments will be the production of alloys and composites with novel microstructures and /or novel properties in bulk form (that is, thicker dimensions than usually obtained by the processes of rapid solidification). For each alloy we will also study the properties of greatest interest. Magnetic properties in the case of Fe-based amorphous alloys, wear resistance for the Fe-C-Cr alloys and ceramic-based composites and mechanical strength for the Al-based alloys. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MATSUO‚ TT; KIMINAMI‚ CS; FO‚ WJ; BOLFARINI‚ C.. Sliding wear of spray-formed high-chromium white cast iron alloys. WEAR, v. 259, n. 1, p. 445-452, . (01/01516-3)

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