The Effect of Magnesium Additions on Microstructural, Thermal, and Mechanical Properties of Rapidly Solidified Al-5.5wt.
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JMEPEG https://doi.org/10.1007/s11665-020-05246-2
The Effect of Magnesium Additions on Microstructural, Thermal, and Mechanical Properties of Rapidly Solidified Al-5.5wt.%Zn-x wt.%Mg (x = 1, 5) Alloys Ercan Karako¨se, Hakan C¸olak, and Mustafa Keskin Submitted: 2 May 2020 / Revised: 25 September 2020 / Accepted: 10 October 2020 The effect of magnesium addition on the morphological, thermal, and mechanical features of conventionally and rapidly solidified Al-5.5 wt.%Zn-x wt.%Mg (x = 1, 5) samples were examined in this work. Al5.5wt.%Zn-x wt.%Mg (x = 1, 5) samples were produced by the conventionally solidified graphite casting and rapid solidification by the melt-spinning method. The morphological and phase structures of the alloys were shown by field emission scanning electron microscopy and x-ray diffractometry. The melting temperatures were examined by differential thermal analysis in an Argon gas environment and the stress and microhardness characteristics of the conventionally solidified and melt-spun ribbons were determined by hardness and tensile strength tests. It was observed that the content of 5 wt.%Mg allowed a radical change in the conventionally solidified alloy morphologies, such as nano-sized dot shape Al12Mg17 particles and smaller sized square shaped MgZn2 particles. Moreover, the ultimate tensile strength, yield strength, and microhardness values of the rapidly solidified Al-5.5Zn-5Mg samples increased by approximately 20%. Finally, it was observed that the microstructural and mechanical properties, such as microhardness/stress values and grain size refinement, were improved with high wheel speeds. Keywords
mechanical properties, Mg solidification, thermal properties
addition,
rapid
1. Introduction Al-Zn-Mg components have been extensively used in automobile industries, aerospace parts, and modern military systems for their superior mechanical features advanced by age hardening (Ref 1-3). For the improvement of automotive and aerospace components, it is of significant consideration that they should be manufactured with minimal economic output, which features low density, relatively high-temperature strength, and high-corrosion resistance. The accomplishment of these features can cause the mitigation of materials resulting in a reduction of fuel consumption and extended lifetime, and so forth. Pure aluminum is soft and exhibits poor mechanical properties. Yet, when it is mixed with minor amounts of zinc, magnesium, silicon, copper, nickel, or other alloying elements, it exhibits considerably improved mechanical properties. The Al-Zn-Mg forging alloys (7xxx series) are used in many automotive components for such applications because of their light weight (low q = 2.70 g/cm3), high corrosion resistance, good castability, and excellent mechanical properties in most
Ercan Karako¨se, Department of Natural Sciences of Engineering, Faculty of Engineering, Architecture and Design, Kayseri University, 38039 Kayseri, Turkey; Hakan C¸olak, Department of Chemistry, Faculty of Sciences, C¸ankırı Karatekin University
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