Synthesis of nanocrystalline Cr-Mn-V-W-X (X=0, Ta) high entropy alloys by mechanical alloying

Abstract

In the present scenario, high entropy alloys (HEAs) are widely used after the first invention in 2004 by yeh[1] and cantor[2] due to their excellent properties and unique microstructure. High entropy alloys (HEAs) which are typically composed of at least five or more principal alloying elements in equiatomic or nearly equiatomic ratio have attracted many researcher's attentions because they have excellent high-temperature strength, high hardness, and good thermal stability[3], [4]. High-entropy alloys (HEAs) offer a great opportunity for the creation of alloy which can sustain high temperature, particularly in applications where existing engineering alloys fall short. High-entropy alloys having BCC structures, particularly refractory high-entropy alloys, are thought to be attractive materials for modern applications where high-temperatures are required. However, some most important HEAs parameters such as high temperature, high stresses, and a complicated corrosive environment necessitate an assessment of the material attributes for use in modern high temperature applications. The mechanical properties like creep strength, embrittlement etc at high temperatures are less in case of conventional alloys which limits the efficiency of conventional alloys. It is therefore necessary to explore novel alloys outside the paradigms of conventional materials to meet the requirement of the material for high temperature applications.