Microstructure and Wear Behavior of Atmospheric Plasma-Sprayed AlCoCrFeNiTi High-Entropy Alloy Coating
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JMEPEG DOI: 10.1007/s11665-016-2396-6
Microstructure and Wear Behavior of Atmospheric Plasma-Sprayed AlCoCrFeNiTi High-Entropy Alloy Coating Li-Hui Tian
, Wei Xiong, Chuan Liu, Sheng Lu, and Ming Fu
(Submitted July 17, 2016; in revised form October 6, 2016) Due to the advantages such as high strength, high hardness and good wear resistance, high-entropy alloys (HEAs) attracted more and more attentions in recent decades. However, most reports on HEAs were limited to bulk materials. Although a few of studies on atmospheric plasma-sprayed (APS) HEA coatings were carried out, the wear behavior, especially the high-temperature wear behavior of those coatings has not been investigated till now. Therefore, in this study, APS was employed to deposit AlCoCrFeNiTi highentropy alloy coating using mechanically alloyed AlCoCrFeNiTi powder as the feedstock. The phase structure of the initial powder, the feedstock powder and the as-sprayed coating was examined by an x-ray diffractometer. The surface morphology of the feedstock powder and the microstructure of the as-sprayed coating were analyzed by field emission scanning electron microscopy and energy-dispersive spectroscopy. The bonding strength and the microhardness of the as-sprayed coating were tested. The wear behavior of the coating at 25, 500, 700 and 900 °C was investigated by analysis of the wear surface morphology and measurements of the volume wear rate and the coefficient of friction. Keywords
AlCoCrFeNiTi, atmospheric plasma spraying (APS), high-entropy alloy (HEA), mechanical alloying (MA), microhardness, wear behavior
1. Introduction With the rapid development of modern industry and increasingly harsh service environments, the materials with quite high hardness and good wear resistance, especially at high temperature, are urgently needed. As a kind of promising high-temperature wear resistant material, high-entropy alloys (HEAs) attracted more and more attentions in recent decades. HEAs are novel materials breaking through the traditional concept of alloy design that based on one principal element or compound. Compared with the traditional alloys, HEAs contain 5-13 main elements with each element in equimolar or near-equimolar ratio. Due to the high configurational entropy, formation of intermetallic compounds and complex structures is restricted, and simple body-centeredcubic (BCC) and/or face-centered-cubic (FCC) solid solutions, even hexagonal close packed solid solution and amorphous phases (Ref 1) can be formed in HEAs. With the advantages of good thermal stability (Ref 2, 3), good corrosion and oxidation resistances (Ref 4), high strength, high hardness and good wear resistance (Ref 5), HEAs can be used as molds, dies, tools, mechanical parts and so on (Ref 6, 7). However, most investigations on HEAs were limited to bulk materials, and those on HEA coatings were rarely reported. Some advanced methods such as laser cladding (Ref 8-10) and magnetron sputtering (Ref 11) were used to prepare HEA Li-Hui Tian, Wei Xiong, Chuan Liu, Sheng Lu, and Ming Fu, School o
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