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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 5/2020

12-05-2020

Design of Novel Non-equiatomic Cu-Ni-Al-Ti Composite Medium-Entropy Alloys

Authors: Gökhan Polat, Ziya Anıl Erdal, Yunus Eren Kalay

Published in: Journal of Materials Engineering and Performance | Issue 5/2020

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Abstract

There has been great attention on high-entropy alloys (HEAs) over the past decade. Unlike conventional alloy systems, HEAs commonly include at least five principal elements with equiatomic or near-equiatomic ratio. HEAs with their superior mechanical, magnetic, and thermal properties are promising materials for critical engineering applications. Medium-entropy alloys (MEAs), which consist of less than five principal elements, have very similar structural features with HEAs such as robust thermodynamic stability and exceptional mechanical performance. The insights of MEAs have not been fully revealed yet. In the present study, novel MEAs (Cu20Ni20Al30Ti30, Cu25Ni25Al25Ti25, Cu34Ni22Al22Ti22, and Cu35Ni25Al20Ti20) have been designed using thermo-physical calculations and Thermo-Calc software. These MEAs were then produced using copper heart arc melting and suction cast into cylindrical rods with 3 mm diameters. X-ray diffraction (XRD), optical microscope (OM), transmission electron microscope (TEM), scanning electron microscope (SEM), and energy-dispersive spectroscopy (EDS) were used for structural characterization. The corresponding results reveal that the Cu20Ni20Al30Ti30, MEA, consists of a body-centered cubic (BCC-B2) phase with intermetallic compounds (ICs), whereas Cu25Ni25Al25Ti25 has single BCC-B2 phase. When the amounts Cu and Ni are increased, system drives itself toward a face-centered cubic (FCC) structure. A dual BCC and FCC composite Cu35Ni25Al20Ti20 has been detected as the most promising MEA among the others with 820 and 1338 MPa measured yield and compressive strength, respectively.
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Metadata
Title
Design of Novel Non-equiatomic Cu-Ni-Al-Ti Composite Medium-Entropy Alloys
Authors
Gökhan Polat
Ziya Anıl Erdal
Yunus Eren Kalay
Publication date
12-05-2020
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 5/2020
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-020-04830-w

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