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Abstract
The development of the high entropy alloys (HEAs) is amongst the most important topics in the field of materials science during the last two decades. The concept of multicomponent, near-equimolar systems has been already applied to the number of other systems, including oxides, carbides, diborides, silicides, and it can be expected that other groups of materials will follow. One of the main driving forces for the development of HEAs is the so-called “four core effects”: high entropy effects, severe lattice distortion, cocktail effect, and sluggish diffusion effect. Their existence and extent has been a subject of heated discussion. Probably the least studied of them is the sluggish diffusion effect, which is of the, especially, high importance from the point of view of the most possible applications of HEAs—as high-temperature materials. Its alleged existence carries a promise of obtaining materials with superior mechanical properties, higher creep resistance, and less susceptibility to high-temperature corrosion. In the current review, the state-of-the-art of diffusion studies in HEAs was presented, as well as the resulting conclusions concerning the existence of the sluggish diffusion effect. Based on the literature analysis, it can be stated that there is no experimental evidence, which would support the existence of the sluggish diffusion in HEAs on the level of tracer and self-diffusivities. Nevertheless, it can be pointed out that our current state of knowledge on the diffusion in HEAs is still far from complete; therefore, further directions of studies are proposed.
Highlights
IntroductionThe high entropy alloys (HEAs) have become one of the most coveted topics in materials science
During the last decade, the high entropy alloys (HEAs) have become one of the most coveted topics in materials science
Based on the obtained results, the authors came to the same conclusions as in [35] that the sluggishness of diffusion in high entropy alloys is much more pronounced in the case of interdiffusion coefficients than in the case of tracer diffusivities
Summary
The high entropy alloys (HEAs) have become one of the most coveted topics in materials science. The configurational entropy of such a system reaches a maximum for a disordered solid solution phase, stabilizing, at least in theory, a simple crystal structure Nowadays, this definition is becoming a bit less strict, with the 4-component, near-equimolar alloys being commonly included in the high entropy family [4]. This definition is becoming a bit less strict, with the 4-component, near-equimolar alloys being commonly included in the high entropy family [4] Such an approach to the alloys’ design drastically differs from the conventional one, in which the alloy is based on one or two principal elements, which impose the main properties of the whole material. The sluggish diffusion effect remains the core effect, on which we are the farthest from the consensus on the matter of its existence
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