Microstructure, Thermal, and Corrosion Behavior of the AlAgCuNiSnTi Equiatomic Multicomponent Alloy

Abstract

The paper presents the microstructure and corrosion behavior of an AlTiNiCuAgSn new equiatomic multicomponent alloy. The alloy was obtained using the vacuum arc remelting (VAR) technique in MRF-ABJ900 equipment. The microstructural analysis was performed by optical and scanning electron microscopy (SEM microscope, SEM-EDS) and the phase transformations were highlighted by dilatometric analysis and differential thermal analysis (DTA). The results show that the as-cast alloy microstructure is three-phase, with an average microhardness of 487 HV0.1/15. The obtained alloy could be included in the group of compositionally complex alloys (CCA). The corrosion resistance was studied using the potentiodynamic method in saline solution with 3.5% NaCl. Considering the high corrosion resistance, the obtained alloy can be used for surface coating applications.

High Entropy Alloys for Medical Applications

“…HEAs are defined as alloys comprising more than five main elements mixed in an equiatomic or near-equiatomic fraction [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Many HEAs have been reported to have: superior mechanical properties, such as ultrahigh fracture even at high temperatures, high hardness, toughness exceeding that of most pure metals and alloys, excellent comparable strength to that of structural ceramics and some metallic glasses, exceptional ductility, and fracture toughness at cryogenic temperatures [1,3], and good physical properties, such as superconductivity, supermagnetism, and significant resistance to corrosion [5].…”

“…According to the most recent evaluations, the criteria for forming simple solid solutions in high entropy alloys must comply with the following conditions [13,14]:…”

“…Even though some inconsistencies can be noticed between the above-mentioned criteria, they are useful to evaluate the conditions under which solid phases are formed in multi-component alloys [13,14].…”

Wear and Corrosion Behaviour of Supersaturated Surface Layers in the High-Entropy Alloy Systems CrMnFeCoNi and CrFeCoNi

“…In recent years, the multi-component alloy concept of high-entropy alloys (HEAs) has received considerable attention [1]. Despite the absence of a main alloy constituent, promising material properties, e.g., high specific strength, high wear resistance and high oxidation and corrosion resistance have been proven [2][3][4]. The demands of superimposed loading require a complex profile of functional surface properties, resulting in a challenge for recent research activities in surface technology [5,6].…”

Growth Mechanisms and the Effects of Deposition Parameters on the Structure and Properties of High Entropy Film by Magnetron Sputtering

“…Actually, HEA powder is usually applied as catalyst and abradant. Although plenty of researchers focus on the HEA bulk, there are difficulties in controlling the grain size and the uniformity of the phase [13,14].…”