Abstract:

In this experimental study, the addition rate and the effect of liquid phase synthesis on the characteristics of the Al6061 matrix B4C particle supplemented metal matrix composite (MMKp) materials produced by the hot pressing active synthesis method was studied. Weight of 0,%, 5% and 10% and 15% B4C ceramic particle additives are mixed for 45 minutes in the pre-alloyed Al6061 metal powder turbula device. The mixed powder is compressed in a pattern of 40x60mm2 in a room temperature at 200 MPa front pressure. Continuously, the lubricant removal process was applied for 45 minutes at a temperature of 400oC under the argon atmosphere within the same mold block. Then, MMKP materials were produced by applying the active synthesis process of hot pressing (SP) under the argon atmosphere for 1 hour under pressure of 100 MPa at 550oC. The secondary synthesis process was carried out on these samples with the application of the super-hard phase synthesis (SKSS) process for 1 hour at a temperature of 610oC. The microbuildings and physical characteristics of the composite materials produced are characterized by metallographic examination, hardness and intensity measurements, cross-breaking resistance (CRD) and broken surface analysis scanned electron microscope (SEM). At the end of the SKSS process, the samples were quickly cooled in the water (S) and slowly cooled in the oven (F), and the impact of the cooling rate was also studied. The SKSS process has partially reduced the intensity of the MMKp materials produced with SP. This effect is greater especially in samples that are left to cool slowly in the oven environment. However, the hardness of the samples quickly cooled in the water and the CVD values have significantly increased.

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