Structural Characterization of AlMgB14 Prepared by Field-activated, Pressure-assisted Synthesis

doi:10.1016/j.jmst.2012.12.008

Abstract

Abstract:

Mechanical alloying (MA) and field-activated, pressure-assisted synthesis (FAPAS) were used for the in situ synthesis and densification of ultra-hard, super-abrasive AlMgB₁₄ metallic ceramic, performed at 1500 °C under a pressure of 60 MPa with the elemental constituents of aluminum, magnesium, and boron. The microstructure and components of synthesized metallic ceramic were observed and determined by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that the main components of the samples were AlMgB₁₄ with a few MgAl₂O₄·MgAl₂O₄ was derived from the contamination of the preliminary powders and the milling process. The average hardness of the samples that provided the results was 26.1 GPa. The average density of the samples was 2.62 g/cm³, which is 98% of its theoretical density. The sample of AlMgB₁₄–TiB₂ composite with 30 wt% TiB₂ had a hardness of 29.5 GPa, which is consistent with that of AlMgB₁₄–TiB₂ composite with 30 wt% TiB₂ prepared by mechanical alloying/hot uniaxial pressing. Thus, a new approach was developed using the mechanical alloying and FAPAS process to synthesize AlMgB₁₄ with fast heating, high efficiency, energy saving, and high yield.

Key words: Field-activated and Pressure-assisted synthesis (FAPAS), AlMgB14, Borides, Microstructure

Wen Liu, Yang Miao, Qingsen Meng, Shaoping Chen1. Structural Characterization of AlMgB₁₄Prepared by Field-activated, Pressure-assisted Synthesis[J]. J. Mater. Sci. Technol., 2013, 29(1): 77-81.

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Structural Characterization of AlMgB₁₄Prepared by Field-activated, Pressure-assisted Synthesis

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