NANOCRYSTALLINE NiAl-TiC COMPOSITES SINTERED BY THE PULSE PLASMA METHOD

Marcin Rosinski ,  Andrzej Michalski 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

The paper presents the results of examinations of nanocrsytalline NiAl-TiC composites produced from nanocrystalline powders. The powders were prepared by mechanical milling and subjected to pulse plasma sintering (PPS). The effects of the sintering process parameters, such as the heating rate, and of the homogeneity of the powder were taken into account. The analysis of the consolidation results chiefly included the characteristic features of the composites, such as the density, hardness, resistance to brittle fracture and grain size. The grain size was measured by X-ray diffraction (XRD) using the Hall-Williamson method and transmission electron microscopy (TEM).

Our experiments show that by using pulse plasma sintering, it is possible to produce sinters with a density very close to theoretical, and with their nanocrystalline structure being preserved. The NiAl-TiC (40wt.%) sinters had a hardness of 1070HV1 and 1000HV30, and the resistance to brittle fracture KIC = 7.5MPa*m1/2.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Marcin Rosinski
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-18 11:41
Revised:   2009-06-07 00:44
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