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Two base matrixes of Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C metal matrix composites (MMCs) were produced using a powder injection technique. Alloying element additions of 0?5 wt-%Ti, 0?35 wt-%Zr and 0?35 wt-%Sc were added to the base matrixes to produce various alloy compositions of Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C MMCs. The production route of the MMCs used in the current project was the molten metal processing technique using powder injection. For the purpose of investigating the reinforcement (B 4 C)/matrix (Al) interaction, five alloy compositions of pure Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C with various additions of Ti, Zr and Sc were produced. A metallic L shaped mould was used for casting the aluminium MMCs. Reinforcement/matrix interface interactions in the produced composites were investigated, using a field emission gun scanning electron microscope and energy dispersive X-ray techniques, as a function of alloying element addition. The powder injection technique used in the present work was proven to be very effective in producing Al-B 4 C MMCs and 6063-B 4 C MMCs with B 4 C concentrations of 15 vol.-%. The produced MMCs show a uniform distribution of the reinforcement of B 4 C in the aluminium matrix.In the alloys free from Ti, Zr and Sc, the B 4 C particles decompose into other products such as AlB due to the reaction between the reinforcement and the aluminium matrix. In alloys containing Zr and Ti, the B 4 C particles react with these elements forming Zr and Ti rich phases, which accumulate in layers that encircle the reinforcement particles and act as protective layers that protect the B 4 C particles from decomposition by preventing their reaction with the aluminium matrix. Sc displays the same positive effect as Ti and Zr in forming protective layers of Sc rich phases surrounding the B 4 C particles and protects them from decomposition. Scandium, however, is not recommended as an alloying element in this case due to its high cost, and as its effect could be attained using cheaper elements such as Ti and Zr.
Two base matrixes of Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C metal matrix composites (MMCs) were produced using a powder injection technique. Alloying element additions of 0?5 wt-%Ti, 0?35 wt-%Zr and 0?35 wt-%Sc were added to the base matrixes to produce various alloy compositions of Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C MMCs. The production route of the MMCs used in the current project was the molten metal processing technique using powder injection. For the purpose of investigating the reinforcement (B 4 C)/matrix (Al) interaction, five alloy compositions of pure Al-15 vol.-%B 4 C and 6063-15 vol.-%B 4 C with various additions of Ti, Zr and Sc were produced. A metallic L shaped mould was used for casting the aluminium MMCs. Reinforcement/matrix interface interactions in the produced composites were investigated, using a field emission gun scanning electron microscope and energy dispersive X-ray techniques, as a function of alloying element addition. The powder injection technique used in the present work was proven to be very effective in producing Al-B 4 C MMCs and 6063-B 4 C MMCs with B 4 C concentrations of 15 vol.-%. The produced MMCs show a uniform distribution of the reinforcement of B 4 C in the aluminium matrix.In the alloys free from Ti, Zr and Sc, the B 4 C particles decompose into other products such as AlB due to the reaction between the reinforcement and the aluminium matrix. In alloys containing Zr and Ti, the B 4 C particles react with these elements forming Zr and Ti rich phases, which accumulate in layers that encircle the reinforcement particles and act as protective layers that protect the B 4 C particles from decomposition by preventing their reaction with the aluminium matrix. Sc displays the same positive effect as Ti and Zr in forming protective layers of Sc rich phases surrounding the B 4 C particles and protects them from decomposition. Scandium, however, is not recommended as an alloying element in this case due to its high cost, and as its effect could be attained using cheaper elements such as Ti and Zr.
The Al-B4C metal matrix composite (MMC) is characterized by its ability to absorb neutrons which makes it the most suitable shielding material for nuclear reactors. The present work was performed on two series of Al-B4C metal matrix composites made using a powder injection apparatus. In one series, commercially pure aluminum (A5) served as the matrix. For the second set, 6063 alloy was used. In all cases the volume fraction of B4C reinforcement particles (grit size 400 mesh, purity 99.5%) was approximately 15%. The volume fraction of the injected B4C particles was determined using a computer driven image analyzer. Measured amounts of Ti, Zr, and Ti + Zr, were added to the molten composites of both series. Microstructural characterization was carried out employing a field emission scanning electron microscope operating at 20 kV and equipped with an electron dispersive x-ray spectroscopic system (EDS). The same technique was applied to characterize the fracture behavior of the tested composites. Mechanical properties of these composites were investigated using impact testing, and ambient and high temperature tensile testing methods. Almost 1000 impact and tensile samples were tested following different heat treatments. The obtained results from these investigations are reported in this Chapter.
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