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Synthesis and characterization of AA5083 and AA2024 reinforced with SiO2 particles

Raja R., Jannet S., Thampy M. A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 2

127--132

Among the types of different particulates, silica is a standout as one of the the cheapest and low-density particulates accessible in substantial amounts. The present study has been centered around the synthesis and study of aluminum matrix composite strengthened with nano-sized SiO2 particles of various weight percentage by means of the stir casting technique. The EDX emphasized the presence of various elements and augmented the in situ reaction. The tensile strength and wear studies were also carried out. The reinforcement materials percentage variation was one of the important factors for the present studies. The Aluminum Alloy 5083 and 2024, which are magnesium and copper-based alloys, had a significant effect on the material characterization.

Aluminium matrix composites reinforced with AlN particles formed by in situ reaction

Dyzia M., Śleziona J.

Archives of Materials Science and Engineering

2008

Vol. 31, nr 1

17-20

Purpose: Ultrafine reinforcement particles are formed as product of reaction between reactive components. Those kinds of materials have good mechanical properties (higher yield stress and creep resistance). Via in situ reaction between liquid metal and reacting substance (solid or gas) is possible to obtain aluminium matrix composites similar to SAP composites by casting methods. Presented results of researches concerning possibilities of obtaining ultrafine aluminium nitride particles via in situ reaction between aluminium alloys (with addition of Mg) and nitrogen. Design/methodology/approach: The experiments were performed in a reaction chamber, heated in a sylite furnace where the 0.3 MPa pressure of nitrogene were obtained and autoclave furnace at gas pressure of 1 MPa. Samples were heated at 1000°C and held at that temperature for 1 hour at the suitable gas pressure. Findings: The research has shown, that vaporization of Mg and indirect nitridation depend on gas pressure in reaction chamber. At high pressure (1 MPa) of N2 in situ reaction procced in limited scope. Practical implications: Using the in situ reaction in order to form AlN dispersion reinforcement in the aluminium alloy matrix seems possible but the control of the reaction is difficult. Originality/value: During the liquid-phase process, the following factors determine the possibility of controlling the process of the dispersion reinforcement phases’ formation: the matrix alloy composition, the temperature, the reactive gas pressure and the time of synthesis.