An Insight into Evolution of Light Weight High Entropy Alloys: A Review

Abstract

High Entropy Alloys (HEAs) are the most recently developed new class of materials, which are known for their unique structural properties. Lightweight materials are currently in excessive demand for transportation and energy saving applications. In this review, efforts have been made to summarize the work done towards the development of HEAs targeting lightweight applications. Some new synthesis techniques are suggested for the fabrication of lightweight HEAs (LWHEAs). The concept of porous structure fabrication, microwave sintering of green compact, casting by disintegration melt deposition and advanced manufacturing using additive manufacturing are discussed as future directions of LWHEAs synthesis. LWHEAs for potential biomedical applications have also been addressed.

Changing Wisdom of Metallic Alloys Development

“…For the likelihood of having a simplified microstructure besides having many elements, HEAS should have entropy of mixing in the range of 11 ≤ ΔS mix ≤ 19.5 J/K mol and enthalpy of mixing in the range of −22 ≤ ΔH mix ≤ 7 kJ/mol [32]. Initially HEAs were developed for high temperature applications with a density hovering around 10 g/cc and later efforts were made to develop light weight HEAs [33]. Conventional processing techniques such as powder metallurgy and casting routes can be utilized for synthesizing HEAs indicating that industrial production is not a major issue but the challenge is to find the composition that suits the end application.…”

“…Conventional processing techniques such as powder metallurgy and casting routes can be utilized for synthesizing HEAs indicating that industrial production is not a major issue but the challenge is to find the composition that suits the end application. Table 4 provides HEAs processed using different methods and with different densities and crystal structure [33].…”

Application of Nano High-Entropy Alloys to Reduce Energy Consumption and Wear of Copper Oxide and High-Grade Iron Ores in Heavy Mining Industries—A Case Study

“…High-entropy alloys [3,[19][20][21][22] and high-entropy nano-alloys [23,24] have not been used as a practical coating in the mineral industry in any form so far. The extraordinary characteristics of high-entropy alloys in can be made us of in heavy industries [25][26][27][28][29][30][31][32][33][34][35][36][37] to produce unique compositions [38][39][40][41][42][43][44][45] and their behaviors and properties [46][47][48] can be manipulated to introduce innovative alternatives, such as filler metals [49], which are hard-facing [50][51][52] and wear resistant [53] to increase to shear failure, high cavitation erosion, and corrosion [54,55]. In general, the impact strength of hardened alloys decreases with increasing carbide content.…”

Diseño y caracterización de tres aleaciones multiprincipales ligeras potencialmente candidatas a aleaciones de alta entropía

“…Numerous studies have been reported regarding in these series of alloys, as found in the review by Pickering and Jones (2016), but research focused in light high entropy alloys is still scarce. Some of them are that by Youssef et al (2015) in AlLiMgScTi but most of them are included in the review by Kumar and Gupta (2016).…”