Abstract
In this work, three novel complex concentrated aluminum alloys were developed. To investigate the unexplored region of the multicomponent phase diagrams, thermo-physical parameters and the CALPHAD method were used to understand the phase formation of the Al80Mg5Sn5Zn5Ni5, Al80Mg5Sn5Zn5Mn5, and Al80Mg5Sn5Zn5Ti5 alloys. The ingots of the alloys were manufactured by a gravity permanent mold casting process, avoiding the use of expensive, dangerous, or scarce alloying elements. The microstructural evolution as a function of the variable element (Ni, Mn, or Ti) was studied by means of different microstructural characterization techniques. The hardness and compressive strength of the as-cast alloys at room temperature were studied and correlated with the previously characterized microstructures. All the alloys showed multiphase microstructures with major α-Al dendritic matrix reinforced with secondary phases. In terms of mechanical properties, the developed alloys exhibited a high compression yield strength up to 420 MPa, high compression fracture strength up to 563 MPa, and elongation greater than 12%.
Highlights
A great deal of effort has been devoted to the development of new lightweight materials during the last decades
∆Hmix = 4 ∑i=1, i6=j Ci Cj ∆Hmix i−j where n is the number of the elements in the alloy, Ci is the atomic ratio of the ith element; Cj is the atomic ratio of the jth element, and ∆Hmix i−j is the enthalpy of mixing between ith and jth elements calculate by Miedema’s model [30]
From the equilibrium phase diagrams and thermo-physical parameters for phase formation in high entropy alloys (HEAs), all the alloys were expected to be composed of a mixture of solid solution (SS) + intermetallic compounds (IC) microstructures
Summary
A great deal of effort has been devoted to the development of new lightweight materials during the last decades. Al-based alloys have received considerable attention, especially in the automotive and aerospace industries, due to the possibility of their light weight and consequent reduction of greenhouse gas emissions. Commercial Al alloys consist of Al as base element and small quantities of solute elements added to improve the mechanical and physical properties. In some cases, these restricted compositions lead to some limitations, such as their performance at high temperatures or low wear resistance. One research focus with relevance to light weight in the transport industry includes the so-called high entropy alloys (HEAs) [1,2]. HEAs were defined as alloys of five or more metallic elements in equimolar or near-equimolar concentrations between 5 and
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