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Fabrication of AM50 magnesium matrix composite with titanium particles by stir casting method DOI:10.15199/28.2016.3.4

  The paper focuses on the experimental magnesium matrix composite reinforced with Ti particles fabricated by the stir casting method. The main objective of the study was to develop a new type of composites with metallic particles fabricated by a simple and inexpensive casting method. For this purpose, one of the cheapest and most widely used alloys, AM50 (Mg-Al-Mn system), was selected as the matrix alloy. The investigated material was prepared on the basis of the AM50 commercial magnesium alloy with 30 wt % spherical Ti particles. The experimental composite was obtained by introducing Ti particles to the mechanical mixing of the molten magnesium alloy under a protective atmosphere. The prepared composite suspension was gravity cast into a metal mould. Analyses of the AM50-Tip composite microstructure were carried out by light microscopy, scanning electron microscopy (SEM + EDS) and X-ray diffraction (XRD). Brinell hardness of the examined material was also measured. Additionally, the weight fraction of the Ti particles was verified by determining their volume fraction using the linear method. The obtained composite exhibited uniform distribution of the Ti particles within the magnesium matrix alloy. According to the presented results of the investigation, no new phases were revealed by the microstructure observations and XRD techniques. The phase composition of the composite was typical for the used component. The matrix alloy was composed of an α-Mg, α + γ eutectic and Al8Mn5 intermetallic phase. Key words: magnesium matrix composites, Ti particles, stir casting, microstructure. Inżynieria Materiałowa 3 (211) (2016) 115÷119 DOI 10.15199/28.2016.3.4 1. INTRODUCTION Metal matrix composites (MMCs) reinforced with different fibers or particles are among various composites of the most recent structural construction materials. Obtaining the designed properties of these composite materials depends, however, on achieving the des[...]

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