Synthesis and characterisation of AlMgB₁₄ and AlMgB₁₄-Ni₃Al composites
by Y.M. Zhou; F.L. Zhang; K. Bai; T. Zhang; H.P. Huang; S.H. Wu; S.M. Luo
International Journal of Mechatronics and Manufacturing Systems (IJMMS), Vol. 11, No. 4, 2018

Abstract: Materials with higher hardness and lower friction coefficients with steel have been proposed as candidates for strategic use in the application fields of cutting tool and friction reduction materials. Aluminium magnesium boride (AlMgB₁₄) and its composites are excellent candidates for these purposes. The impurity of MgAl₂O₄ is normally formed in the synthesised AlMgB₁₄ because of oxygen and oxide involved from raw materials and processing, so an extra amount of Al and Mg beyond the stoichiometric ratio of AlMgB₁₄ were introduced into the raw elemental powders to synthesise AlMgB₁₄ in an atmosphere of argon at 1,500°C. The AlMgB₁₄-Ni₃Al composites were also synthesised by hot pressed sintering at 1,450°C and 1,600°C separately. The microstructure and mechanical properties of AlMgB₁₄ and AlMgB₁₄-Ni₃Al composites were also examined. The results showed that extra addition of 5 wt.% Al and 5 wt.% Mg can reduce the production of MgAl₂O₄ in the formation of AlMgB₁₄. Besides of AlMgB₁₄ and MgAEO₄, Ni₃Al and NiAl are identified in the AlMgB₁₄-Ni₃Al composites, the hardness and fracture toughness of AlMgB₁₄-Ni₃Al composites are decreased with higher content of Ni₃Al due to the present of Ni₃Al and NiAl phase.

Online publication date: Fri, 05-Oct-2018

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