Abstract
High-entropy alloys (HEAs) are emerging as a hot research frontier in the metallic materials field. The study on the effect of alloying elements on the structure and properties of HEAs may contribute to the progress of the research and accelerate the application in actual production. FeCoCrNiAlTix (x = 0, 0.25, 0.5, 0.75, and 1 in at.%, respectively) HEA coatings with different Ti concentrations were produced on Q235 steel via laser cladding. The constituent phases, microstructure, hardness, and wear resistance of the coatings were investigated by XRD, SEM, microhardness tester and friction-wear tester, respectively. The results show that the structure of the coating is a eutectic microstructure of FCC and BCC1 at x = 0. The structure of coatings consists of both proeutectic FCC phase and the eutectic structure of BCC1 and BCC2. With the continuous addition of Ti, the amount of eutectic structure decreases. The average hardness of the FeCoCrNiAlTix HEA coatings at x = 0, 0.25, 0.5, 0.75, and 1 are 432.73 HV, 548.81 HV, 651.03 HV, 769.20 HV, and 966.29 HV, respectively. The hardness of coatings increases with the addition of Ti, where the maximum hardness is achieved for the HEA at x = 1. The wear resistance of the HEA coatings is enhanced with the addition of Ti, and the main worn mechanism is abrasive wear.
Highlights
The concept of high-entropy alloys (HEAs) is a new alloy design philosophy that was proposed recently, breaking the bottleneck stage of the conventional alloy design concept
The HEA philosophy considers that multiple principle elements in an alloy system will not produce brittle phases such as intermetallic compounds (IMCs) or other complex phases, leading to brittleness and difficulties in processing and application
BCC11 systems exist in the FeCoCrNiAl coating, which can be identified as (Fe, Ni) and Fe–Cr phases, respectively.,the the system disappears in FeCoCrNiAlTi the FeCoCrNiAlTi
Summary
The concept of high-entropy alloys (HEAs) is a new alloy design philosophy that was proposed recently, breaking the bottleneck stage of the conventional alloy design concept. The HEA philosophy considers that multiple principle elements in an alloy system will not produce brittle phases such as intermetallic compounds (IMCs) or other complex phases, leading to brittleness and difficulties in processing and application. The main reason people think multiple principle elements will decrease the property of the alloy is the Gibbs phase rule. According to the Gibbs phase rule, f = n − p + 1 (f, freedom degree; n, component number; p, phase number), the equilibrium solidification phase number for n kinds of elements is given by p = n + 1. Since phase formation processes are always non-equilibrium solidification, the number of phases tends to be given by p > n + 1. A new path of alloy design was carried out for the first time by Yeh et al [5,6] in
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
