Microstructure And Lattice Parameters Of Aln Particle-Reinforced Magnesium Matrix Composites Fabricated By Powder Metallurgy

Keywords

AlN particle; Lattice parameter; Metal matrix composite; Microstructure; Powder metallurgy; Solid solubility

Abstract

Magnesium matrix composites reinforced with AlN particles were fabricated by the powder metallurgy technique. The evolution of lattice constants and solid solubility levels of Al in a-Mg and the microstructure of Mg-Al/AlN composites were investigated in the present study. The results showed that the solid solubility of Al in a-Mg reached a relatively high level by the P/M process with a long time of milling. X-ray diffraction showed that the peaks of Mg phase clearly shifted to higher angles. The lattice constants and cell volume decreased significantly compared with those of standard Mg due to a significant amount of Al incorporated into a-Mg in the form of substitutional solid solution. The degree of lattice deformation decreased at a low sintering temperature and increased at higher sintering temperatures due to the presence of AlN. Microstructural characterization of the composites revealed a necklace distribution of AlN particles in the Mg matrix. Heat treatment led to precipitation of Mg17Al12 from the supersaturated a-Mg solid solution. The precipitate exhibited granular and lath-shaped morphologies in Mg matrix and flocculent precipitation around AlN particles.

Publication Date

11-1-2015

Publication Title

Acta Metallurgica Sinica (English Letters)

Volume

28

Issue

11

Number of Pages

1354-1363

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s40195-015-0333-6

Socpus ID

84957799264 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84957799264

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