The microstructure of WC/Co hard alloys after surface laser treatment is studied. It is established that during the laser treatment of the hard alloys, the chemical interaction between the components of the WC/Co powder mixture occurs in the samples' surface according to the reaction 3Coz3WCR(Co; W) 3 Cz2C. High cooling rate during the laser treatment allows preserving the products of this reaction, i.e. graphite inclusions and complex carbide (Co; W) 3 C to room temperature.
PN85U15 - Ni composites were obtained by spark plasma sintering (SPS) of the powder mixture consisted of nickel and nickel aluminide. Particular attention in this study was focused on the discussion of the problem concerning the influence of the nickel content on mechanical properties of the sintered composites. The microstructure of the sintered materials consisted of spherical intermetallic particles homogeneously distributed in the nickel matrix. The relative density of all sintered materials was higher than 90 %. The hardness of the fabricated composites decreased from 3100 MPa (PN85U15 sintered powder) to 2500 MPa (70 % PN85U15 with 30 % Ni). It was found that the PN85U15 – Ni composite containing approximately 30 wt. % of Ni possessed the highest bending strength (1900 MPa).
In this paper structure and mechanical properties of Ni3Al intermetallic compound was studied. The materials was fabricated according to different schemes, which combined mechanical alloying of Ni and Al powders, self-propagating high temperature synthesis (SHS) and spark plasma sintering (SPS). Relative density of all sintered samples was ~ 97 %. Microhardness of the sintered materials ranged from 6100 to 6300 MPa. SPS of 86.71 % wt. Ni and 13.29 % wt. Ni powder at 1100 °C led to formation of material with the highest level of tensile strength equal to 400 MPa.
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