Copper is widely used in industrial applications because of its high electrical and thermal conductivity, easiness of processing and good corrosion resistance. However, copper also has some distinct limitations such as low hardness, low tensile yield strength and poor creep resistance. In this report copper matrix was reinforced with ceramics like Al2O3 and B4C particles using powder metallurgy (PM) method and its microstructure was examined with SEM and EDS. The microstructure has revealed an uniform distribution of particles in the matrix and a good interface bonding between B4C particles and the matrix. However the dispersion of Al2O3 particles, of larger sizes, has led to some porosity and inter-particle contacts in the composites. Therefore, hardness of B4C particlereinforced composites is significantly higher than that of Al2O3 particle-reinforced composites.
TiNi shape memory alloy and its composite using d-Al 2 O 3 nanosize particles were prepared by the powder metallurgy method, and some mechanical properties like hardness, wear, and corrosion behavior were investigated. The experimental results exhibited that the lower wear rate was obtained for the nano-Al 2 O 3 -reinforced Ti alloy composite due to increased hardness, but the wear rate increased considerably with increasing the load over 25 N for Ti alloy. However, the best corrosion resistance was obtained for the base alloy, which is very important for implant applications.
Aluminum alloys have been extensively used as structural material due to its high strength and damage-tolerance. Alloy 6061, 2024 and 7075 are engineered to be lightweight and strong,and their ease of formability allows complex shapes and drawn parts,which can then be further enhanced with heat treating. In this study is aimed to improve the mechanical properties of aluminum alloys by heat treatment.AA2024 and AA7075 were selected and each alone at T3 and T6 temper conditions has been studied respectively.For the mechanical properties of AA2024 and AA7075 alloyshardness, fatigue behavior, tensile test and charpy impact test with standard V notched specimens at RTand-5 °C were analysed in the present study. Microstructural characterization has been done using standard metallography.
This study presents the fabrication and characterization of composite materials of hydroxyapatite and aluminum oxide. Hydroxyapatite powder was obtained from bovine bones via conventional calcination routine. Although hydroxyapatite shows great biocompatibility with the human body, its applications are limited to non-load bearing areas. For this purpose, fine powders of hydroxyapatite/alumina were admixed with 1 and 5 wt.% yittria. Powder-compacts were sintered by two-step sintering route by increasing temperature to 1550°C for 2 h and then sintering at 1450°C for 4 h. The effect of increasing yittria content on sintering behavior and mechanical properties was investigated in biocomposite hybrid materials.The effect of yttrium oxide in hydroxyapatite/aluminum oxide hybrid biocomposite … Materialwiss. Werkstofftech.
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