Abstract
The Ti0.8W0.2C alloys were sintered at different temperatures after being synthesized by mechanical alloying for a grinding time of 10 and 20 h. The temperatures used to perform the sintering of the samples were 1100, 1135, 1150 and 1240 °C for a holding duration of 5 min and under a pressure of 100 MPa. XRD patterns demonstrate that a thermal decomposition has occurred for the Ti0.8W0.2C powders sintered at all temperatures. For the two milling duration, the SEM analysis showed a dense microstructure with the presence of pores in a very small quantity for the sintering at 1150 °C. For the consolidated carbides after 10 h milling, the fluctuations in the lattice parameter of the (Ti0.8W0.2)C carbide could be attributed to the effective internal strain variation in the material. The relative density, micro-hardness and diffraction crystallite size (DCS) increased with sintering temperature. So, the variation in hardness does not follow the Hall–Petch relationship. For a DCS of 25 nm, the relative density and micro-hardness of the consolidated carbide, treated at the optimal temperature of 1240 °C after 10 h MA, reached respectively 93.53% and 2719 HV. Thus, the micro-hardness is mainly related to the variation of porosity, rather than to the variation of diffraction crystallite size. The highest Young's modulus value (406.78 GPa) is obtained at sintered temperature of 1240 °C after 10 h of milling.
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More From: International Journal of Refractory Metals and Hard Materials
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