Synthesis and characterisation of various M▫$g_2$▫Sn-based composites made from laboratory prepared M▫$g_2$▫Sn powder
Kevorkijan, Varužan ; Škapin, Srečo D.
Single-phase Mg2Sn powders were successfully reaction-synthesized from elements and used for the preparation of Mg2Sn-based composites with different microstructures and resulting properties. These ...samples were dense (>95% T.D.) Mg- and Al-metal-matrix composites (MMCs) reinforced with either Mg2Sn particles or mixtures of Mg2Sn with TiC or TiB2 particulates produced by the infiltration of porous Mg2Sn preforms with molten magnesium or aluminium; and (ii) Mg2Sn intermetallic matrix composites (MCs) discontinuously reinforced with TiC and TiB2 particles produced by pressureless sintering. The samples infiltrated with molten magnesium possessed a characteristic lamellar eutectic microstructure and an enhanced fracture toughness (7.7MPa m1/2 in non-reinforced and 5.8MPa m1/2 in reinforced counterparts), in combination with tensile properties and Vickers hardnesses superior to those of conventional Mg-Sn alloys. The densification of IMCs with a Mg2Sn matrix discontinuously reinforced with a TiC or TiB2 ceramic reinforcement performed by non-reactive, solid-state sintering resulted in samples with a high density (>95% T.D.) and different combinationsof mechanical properties compared to MMCs obtained by infiltration. The tensile properties and the Vickers hardnesses of the sintered IMCs were much better than in the MMCs obtained by infiltration, with the exception of the fracture toughness, which was reduced to below 1.8 MPa m1/2.
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