Abstract
Mechanical alloying(MA) and field activated and pressure assisted synthesis(FAPAS) combining the method of in-situ synthesis were used for the preparing ultra-hard, super-abrasive AlMgB14 metallic ceramic. AlMgB14 was performed at 1500°C under a pressure of 60 MPa from the elemental constituents (aluminium, magnesium and boron (vacuum annealed 1500°C)). The sample was examined by SEM, EDS and XRD. The products contained uniform AlMgB14. The hardness of AlMgB14 prepared under these conditions is 27.2-32.5GPa, the average density is 2.62g/cm3 and the fracture toughness is 3MPam1/2.These values are in correspond to the hardness of AlMgB14 prepared by mechanical alloying/hot uniaxial pressing (28-35GPa). Analysis of the mechanisms of fracture,the fracture surface of AlMgB14 sintered at 1500°C is of transgranularfracture. A new approach is brought forward by the mechanical alloying assisted FAPAS process (MA-FAPAS) to have synthesized AlMgB14 with fast heating-up, efficiency, energy saving and high yield.
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