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Study on mechanical properties and microstructure for three compounds of Al-Sn-Mg ternary alloys
No full textIn the present study, the microstructure and mechanical properties of Al-Sn-Mg ternary alloy were investigated depending on the composition. When the microstructures of the compositions of the alloy are examined, it was observed that Mg2Sn, Mg3Sn1,67 intermetallic phases were formed at the grain boundaries. However, the grain size of each phase changed depending on the composition. It has been observed that such changes in the microstructure affect the mechanical properties of the material. The 94 at. % Al-2.5 at. % Sn-3.5at. % Mg has been found to have the most suitable material properties in terms of ductility and strength. The hardness of [96.5-x] at. % Al-[x] at. % Sn-3.5 at. % Mg (x = 2.5, 8.5 (eutectic composition), 14.5) compounds was measured 52 HV (0.1), 47 HV (0.1), 40 HV (0.1) for bulk samples and 72 HV (0.1), 56 HV0.1, 51 HV (0.1) for rod-shaped samples, respectively
Thermoelectrical properties of supra-eutectic, eutectic and sub-eutectic compositions of Al-Sn-Mg ternary alloys
No full textThe electrical resistivity of pure Al, pure Sn, pure Mg and the compounds with the general composition [96.5-x] at. % Al-[x] at. % Sn-3.5 at. % Mg (x = 2.5 (supra-eutectic), 8.5 (eutectic), 14.5 (sub-eutectic)) were measured by four-point probe (DC 4PPT) method in the temperature range of 323-823 K. The electrical resistivity of the alloy was observed to increase depending on the temperature. The temperature coefficients for the compounds with the general composition [ 96.5-x] at. % Al-[x] at. % Sn-3.5 at. % Mg (x = 2.5, 8.5, and 14.5) are 82.16 x 10(-4), 11.72 x 10(-4), and 4.53 x 10(-4) respectively. The variations of thermal conductivity were determined by Wiedemann-Franz Law (W-F) and Smith-Palmer (S-P) equation using the data obtained from electrical properties. Thermal conductivity values for the three compounds of alloy were decreased depending on the temperature. The microstructures of the same ternary alloys were obtained from SEM (Scanning electron microscopy), MAPPING and EDX (Energy Dispersive X-ray Spectroscopy) analysis. (C) 2020 Published by Elsevier B.V
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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