Abstract
Alloying has been very common practice in materials engineering to fabricate metals of desirable properties for specific applications. Traditionally, a small amount of the desired material is added to the principal metal. However, a new alloying technique emerged in 2004 with the concept of adding several principal elements in or near equi-atomic concentrations. These are popularly known as high entropy alloys (HEAs) which can have a wide composition range. A vast area of this composition range is still unexplored. The HEAs research community is still trying to identify and characterize the behaviors of these alloys under different scenarios to develop high-performance materials with desired properties and make the next class of advanced materials. Over the years, understanding of the thermodynamics theories, phase stability and manufacturing methods of HEAs has improved. Moreover, HEAs have also shown retention of strength and relevant properties under extreme tribological conditions and radiation. Recent progresses in these fields are surveyed and discussed in this review with a focus on HEAs for use under extreme environments (i.e., wear and irradiation) and their fabrication using additive manufacturing.
Highlights
high entropy alloys (HEAs) in terms of their composition, tureas and theirsince mechanical properties,research such as ultimate tensile strength (UTS), tensile stepped into this field well, the reviewed publications on additive manufacturing (AM), wear be‐ elongation (ε), yield strength (YS), hardness (H), compressive strength (CS), compressive havior and nuclear applications of HEAs are listed in a detailed tabular form with their yield strength (CYS) and the amount of compression (C)
This material has the concentration of each element out of the range suggested by the first definition, but it has sufficiently high entropy according to the second definition [15]
The minimum wear rate was as low as 4.14 × 10−6 mm3 ·N−1 ·m−1 which was attributed to the reduced grain size and improved hardness due to the solid solution strengthening effect of the HEA binder
Summary
Since the first copper-based alloy was developed around 7000 years ago, numerous metallic alloys have been utilized in various applications [1]. In the beginning of the 21st century, when the alloying technology reached maturity and so did the capability of materials for more advanced applications, a new alloying concept emerged. These alloys were initially called by several different names, such as multi-principal elements alloys, equi-molar alloys, equi-atomic ratio alloys, substitutional alloys and multicomponent alloys. W. Yeh [3], because these alloys have higher mixing entropy in their liquid or solid solution states than any other alloying systems. W. Yeh [3], because these alloys have higher mixi entropy in their liquid or solid solution states than any other alloying systems. HEAs are considered are considered one of three innovations in the alloying techniques along with bulk met one of three innovations in the alloying techniques along with bulk metallic glasses and lic glasses and metal metal rubbers [2]. rubbers [2]
Sign-in/Register to view highlights & summary 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.
