Browsing by Author "Uzun, A"
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Web of Science Publication Compressive crush performance of square tubes filled with spheres of closed-cell aluminum foams(2017-09-26) Uzun A.; Uzun, AThis paper describes the compressive crush behaviour of spheres of closed-cell aluminium foams with different diameters (6, 8 and 10 mm) and square tubes filled with these spheres. The spheres of closed-cell aluminium foams are net spherical shape fabricated via powder metallurgy methods by heating foamable precursor materials in a mould. The square tubes were filled by pouring the spheres of closed-cell aluminium foams freely (without any bonding). The compressive crush performance of square tubes filled with spheres of closed-cell aluminum foams were compared to that of the empty tubes. The results show a significant influence of the spheres of closed-cell aluminium foam on the average crushing load of the square tubes. The energy absorption in the square tube filled with spheres of closed-cell aluminium foam with diameters of 10 mm is higher than in the other square tubes. The spheres of closed-cell aluminium foams led to improvement of the energy absorption capacity of empty tubes.Web of Science Effect of Foaming Agent on The Structure and Morphology of Al and Alumix 231 Foams Produced by Powder Metallurgy(2011.01.01) Turker, M; Ozcatalbas, Y; Cinici, H; Gokmen, U; Uzun, AWeb of Science Friction stir welding of foamable AlSi7 reinforced by B4C(2016.01.01) Uzun, A; Turker, MWeb of Science Web of Science Investigation of mechanical properties of tubular aluminum foams(2016.01.01) Uzun, A; Karakoc, H; Gokmen, U; Cinici, H; Turker, MWeb of Science Investigation of Modal Properties of AlSi7 Foam Produced by Powder Metallurgy Technique(2013.01.01) Uzun, A; Gokmen, U; Cinici, H; Koruk, H; Turker, MWeb of Science Landscape Ecological Evaluation of Cultural Patterns for the Istanbul Urban Landscape(2022.01.01) Aksu, GA; Tagil, S; Musaoglu, N; Canatanoglu, ES; Uzun, APublication Production of aluminium foams reinforced with silicon carbide and carbon nanotubes prepared by powder metallurgy method(2019-09-01) Uzun A.; Uzun, AIn this study, aluminium foams reinforced with silicon carbide and carbon nanotubes were produced by powder metallurgy method. The master alloy aluminium powder (AlSi12)was used as the matrix material, titanium hydride (TiH2)powder was used as a foaming agent and silicon carbide (SiC)particles and carbon nanotubes (CNTs)were used as reinforcing elements. Therefore, 1% of TiH2 by weight and different proportions of SiCx/CNTy (x: 0%, 2%, 4%, 6%, y: 0%, 0.2%, 0.5%, 0.8%, 1%)were added into the master alloy AlSi12 powder and mixed. The mixed powders were further pressed at a pressing pressure of 600 MPa and a temperature of 430 °C. The pressed samples were subjected to the extrusion process at 430 °C, and samples having diameters of 11.76 mm were produced. The foamable precursor materials that were obtained in this manner were subjected to the foaming process at a temperature of 750 °C. The experimental results exhibited that the relative density values of more than 94% were obtained from the foamable precursor materials. It was determined that the CNT and SiC particles significantly affected the elastic–plastic deformation behaviour of the precursor materials. Further, increasing tendencies have been observed in the case of Young's modulus and averege stress in composite foams depending on an increase in the number of CNT and SiC particle.Web of Science Web of Science Web of Science PRODUCTION OF MELT-SPUN Al-20Si-5Fe ALLOY AND BORON CARBIDE (B4C) COMPOSITE MATERIAL(2018.01.01) Kilicaslan, MF; Uzun, A; Karakose, EWeb of Science Production of MWCNT-Reinforced Aluminum Foams Via Powder Space-Holder Technique and Investigation of their Mechanical Properties(2022.01.01) Sbia, AESA; Uzun, AWeb of Science THE EFFECT OF B4C ADDITION ON PORE MORPHOLOGY OF THE ALSI7 FOAMS(2015.01.01) Uzun, A; Turker, MWeb of Science The Effect of Production Parameters on the Foaming Behavior of Spherical-shaped Aluminum Foam(2014.01.01) Uzun, A; Turker, MWeb of Science Publication The effect of welding speed on the weld seam profile in MAG and TIG/MAG hybrid arc welding(2017-04-01) Uzun A.; Uzun, AThe effect of welding speed on the weld seam profile in MAG and TIG/MAG hybrid arc welding was investigated in a low carbon steel. AISI 1020 steel materials having 5 mm thickness were used in the experiments. A fixed MAG and TIG welding currents (90 A and 100 A, respectively) and three different welding speeds (0.14, 0.21 and 0.30 m/min) were selected for welding process for a 100 mm long weld. The welded specimens were cut into several cross-sections; then metallographic tests were performed. The effect of TIG/MAG hybrid arc welding process was compared with the conventional MAG welding. The study showed that welding speed and the selected method have influence on the penetration and that the ratio of penetration depth / weld seam width is increased with increasing welding speed. This increase is more pronounced in TIG/ MAG hybrid arc welding compared to conventional MAG welding. The microstructure of the weld metal was also changed relatively by variation of welding speed. With all welding parameters, the weld metal hardness is higher than hardness of the HAZ and the base metal.Web of Science The investigation of mechanical properties of B4C-reinforced AlSi7 foams(2015.01.01) Uzun, A; Turker, MWeb of Science Vickers Microhardness Studies on B4C Reinforced/Unreinforced Foamable Aluminium Composites(2018.01.01) Uzun, A; Asikuzun, E; Gokmen, U; Cinici, H