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Mechanism of Reactive Sintering of AlMgB14 by the Field Activated and Pressure Assisted Synthesis

The reactive sintering of the hard boride AlMgB14 from the elements was investigated using Mechanical Alloying (MA) and Field Activated and Pressure Assisted Synthesis (FAPAS) method. The mechanism of formation of AlMgB14 was investigated over the temperature range 1200°C–1500°C. The effect of temperature and pressure was discussed. Under optimum conditions, the products contained AlMgB14 with 95 vol%, the remaining phases include spinel (MgAl2O4) and impurity from milling. Microstructure analysis the samples mainly contained the AlMgB14. The average hardness of AlMgB14 prepared under these conditions is 27.2 GPa while the average density is 2.62 g/cm3 and the fracture toughness is 3 MPam1/2.