ABSTRACT
Greenhouse gas emissions have reached a level that has not been seen during the last 8,000+ years. The impact is clearly visible and worldwide efforts are currently ongoing to minimize it. The transportation sector is one of the main sources responsible for greenhouse gas emissions. A cost-effective means to reduce the emissions of greenhouse gas is by enabling a reduction in weight of vehicles/automobiles. In this regard, high entropy alloys (HEAs) can be put to effective use, provided their density is noticeably less than currently used materials. The alloying concept of high entropy alloys (HEAs) is based on the use of multiple-principal alloying constituents in order to reach the required high entropy of the system. High entropy alloys (HEAs) can exhibit properties that are observably superior to the conventionally developed alloys. Several equiatomic and non-equiatomic lightweight high entropy alloys (LWHEAs) are presented in this technical manuscript. The compositions tested and challenges encountered during synthesis of these innovative alloys are listed. An analysis was made of their microstructures and resultant mechanical properties and the results are neatly presented and briefly discussed. In view of the currently developed lightweight high entropy alloys (LWHEAs), the main expectation is for the interested researchers to excavate the idea of creating more new compositions with continued advancements in the development and emergence of this unconventional and novel alloy system.
