Physical Properties of Directionally Solidified Al-1.9Mn-5Fe Alloy
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JMEPEG https://doi.org/10.1007/s11665-020-05253-3
Physical Properties of Directionally Solidified Al-1.9Mn-5Fe Alloy _ Yılmazer, E. C¸adırlı I.
, H. Kaya, and U. Bu¨yu¨k
Submitted: 17 May 2020 / Revised: 31 August 2020 / Accepted: 3 October 2020 Al-1.9Mn-5Fe (wt.%) alloy was prepared by adding 5 wt.% Fe to the eutectic Al-Mn alloy. This alloy undergone controlled solidification under four different growth velocities (V) in Bridgman-type furnace. Eutectic spacings (k), microhardness (HV), ultimate tensile strength (rU) and electrical resistivity (q) of these alloys were determined. While the HV and rU increased with increasing V values or decreasing k, the elongation (d) values decreased. In addition, relationships between these parameters were investigated using linear regression analysis. Microstructure photographs of directionally solidified samples were taken by optical microscope and scanning electron microscope (SEM). The eutectic spacings were measured from these photographs. The relationships among growth velocity (V), eutectic spacing (k), microhardness (HV), ultimate tensile strength (rU) and electrical resistivity (q) were measured by suitable method and tests. The q measurements were carried out depending on V and temperature (T). While temperature coefficient of resistivity (aTCR) was calculated from the q–T curve, the values of thermal conductivity (K) predicted by Wiedemann–Franz (W–F) and Smith–Palmer (S–P) equations. It was found that the microstructure, microhardness, tensile strength and electrical resistivity were affected by both eutectic spacing and the growth velocity. Keywords
eutectic spacing, microhardness, resistivity, tensile strength, thermal conductivity
1. Introduction The alloying components added to the aluminum further improve the properties of the material, making it superior to other metals. Aluminum and aluminum alloys are the most important metal group after iron-based materials in the world. It is also the most used among light metals both in pure form and in alloys (Ref 1-10). Aluminum alloys composed with the addition of copper, silicon, iron, zinc, magnesium, manganese, nickel, titanium and many others to the aluminum. One or a combination of those cited elements can be used to form these alloys. Alloying elements added to aluminum can be classified with their supplemental properties as castability, mechanical strength, chemical stability, workability, thermal expansion, thermal conductivity and heat resistance (Ref 1). The physical properties of the Al-Mn alloy formed with alloying elements as Cu, Si, Fe by solidifying it in a controlled directionally form in either fast or cast form by Bridgman-type furnace have been reported in the literature, but the results differ from each other (Ref 11-16). In equilibrium conditions at 927.14 K, the maximum solubility of Fe in Al is 0.046 wt.% Fe. In Fe-containing alloys, the maximum solubility of Mn may be approximately _ Yılmazer, H. Kaya, and U. Bu¨yu¨k, Department of Science I. Education, Faculty of Education, Erciyes University,
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