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x High Entropy Alloys
Published in T.S. Srivatsan, Manoj Gupta, High Entropy Alloys, 2020
Vikas Kukshal, Amar Patnaik, I.K. Bhat
Currently, the superalloys are the backbone of various industries, including energy generation, oil and gas extraction, and the metallurgical and aerospace industries. Superalloys provide the benefits of a low weight material along with an increase in the efficiency of the machine. Despite all these advantages, there is a considerable challenge in the field of materials science to overcome the shortages of the existing superalloys. Compared to the predictable metallic alloys based on the combination of specific elements, high entropy alloys (HEAs) generally contain five or more principal elements with a concentration range of 5 and 35 at.% [4]. High entropy alloys exhibit exceptional properties such as improved hardness, high tensile strength, high compressive strength, excellent wear, and corrosion resistance, explaining their potential applications in different fields [5].
Prediction model of elastic constants of BCC high-entropy alloys based on first-principles calculations and machine learning techniques
Published in Science and Technology of Advanced Materials: Methods, 2022
G. Hayashi, K. Suzuki, T. Terai, H. Fujii, M. Ogura, K. Sato
High-entropy alloys (HEAs) are a new class of metallic alloys composed of more than 5 different elements with equiatomic or near equiatomic composition. Following the original works of the fabrication of HEAs [1–5], significant efforts have been devoted to synthesizing HEAs and investigating their physical properties from various points of view. So far, in this new category of alloys many exceptional physical properties have been reported [6], such as high hardness and high-temperature strength [7], good temperature dependence of strength and ductility [8], thermal stability [9], high hardness and low-density refractory [10], resistances to wear, corrosion, oxidation, and fatigue [11–14], bio-compatibility [15], and even superconductivity [16]. Thus, HEAs become a new category of alloy studies and provide opportunities to explore new functional alloys.
Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy
Published in Virtual and Physical Prototyping, 2020
Dandan Zhao, Quan Yang, Dawei Wang, Ming Yan, Pei Wang, Mingguang Jiang, Changyong Liu, Dongfeng Diao, Changshi Lao, Zhangwei Chen, Zhiyuan Liu, Yuan Wu, Zhaoping Lu
High-entropy alloy (HEA) is a new class of metallic materials, which have a simple solid solution structure formed by mixing of multiple principal elements in equal or near-equal ratio. Since inception, HEAs have been attracting more and more attention due to their unique properties and structural stability from both the scientific and industrial communities (Zhang et al. 2014; George, Raabe, and Ritchie 2019), which offers great application potential in aspects of space technology, national defence, energy industry, etc. Over the past decade, various HEA systems with different lattice structures have been explored (Yeh et al. 2004; Zhang, Liaw, and Zhang 2018; Li et al. 2016). Among them, equiatomic CoCrFeMnNi HEA has been extensively studied due to its excellent cryogenic mechanical properties and simple single-phase face-centred cubic (FCC) structure (Li 2019; Park et al. 2020; Naeem et al. 2020). Like a conventional FCC alloy, nevertheless, the yield strength of this HEA is relatively low at room temperature, although its ductility is higher than 50% (Li 2019). To overcome this, many approaches have been proposed, such as cold rolling and recrystallisation, thermo-mechanical processing and second phase strengthening (Schuh et al. 2015; Hou et al. 2019). However, the increase of strength is always accompanied with the sacrifice of ductility.
Evaluation of the impact of Mn and Al on the microstructure of Fe–Co–Ni–Cr based high entropy alloys
Published in Canadian Metallurgical Quarterly, 2023
M. Ilinich-Shaw, D. Wang, X. Huang, S. Yandt
High entropy alloys (HEAs) are a new class of metallic materials defined as alloys composed of 5 or more elements in nearly equiatomic concentrations, with each element having a concentration in the range of 5%–35 at.-% [1,2]. HEAs are defined by four core characteristics: (1) high mixing entropy, (2) severe lattice distortion, (3) cocktail effect, and (4) sluggish diffusion [3–7]. This new class of alloys draws great interest, particularly in the transportation and energy industries, owing to the enhanced mechanical and environmental properties needed for ever-demanding operating environment limits. These alloys have the potential to outperform conventional superalloys in construction and longevity of energy conversion system components [8].