High entropy alloys (HEAs) are an emerging class of engineering materials with excellent mechanical, thermal, chemical and electrical properties due to constituent alloying elements and type of synthesis/processing criteria. This literature review intends to find product manufacturing aspects from HEAs while relating them to their synthesis and characterisation. A wide range of synthesis modes has been developed for HEAs recently. Methods of synthesis, both bulk and powder-based, are reviewed and discussed at length in this article. Based on the researcher’s results, various characterisation studies like materials, mechanical, chemical, electrical, and magnetic are also discussed. For product manufacturing, it is observed that very few machinability studies have been carried out on HEAs to honour post-machining material properties. Research on HEAs in the manufacturing domain, if done, will lead to their extensive industrial applications. Further, several potential applications have been suggested for specific HEAs based on the composition of constituent elements.

The hybrid micro-machining process employs simultaneous or ensuing action of two or more machining processes or takes aid of some energy assistance in material removal to enhance advantages and minimize potential disadvantages found in individual material removal techniques. There are various examples, such as abrasive electro-discharge grinding, electrochemical discharge machining, laser-assisted turning, and jet-assisted machining. This article presents a novel classification of and reviews the past and present research and applications of the hybrid micro-machining process, highlighting its effects on response variables such as material removal rate, tool wear, and surface roughness. Although hybrid micro-machining has been an active research area in non-conventional and critical machining since few years, insufficient knowledge about capabilities in sizes, materials, machinery, and manipulating devices is still a major constraint in the development of these processes. In the near future, there is ample scope for the hybrid micro-machining process in exploring issues in material removal at micro-scale, effect of residual stresses, and environment.