Abstract
The advancement of nanotechnology demands large-scale preparation of nanocrystalline powder of innovative materials. High-entropy alloys (HEAs) exhibit unique properties: mechanical, thermal, magnetic etc., making them potentials candidates for applications in energy, environment and biomaterials etc. Thus, there is a need to develop novel synthesis methods to prepare nanocrystalline high-purity HEAs in large quantity. Conventional mechanical alloying of the multicomponent metallic powder mixture requires larger milling time and it is prone to contaminations and phase transformation. The present investigation reports a unique approach, involving casting followed by cryomilling, leading to formation of nanocrystalline HEAs powder, which are relatively contaminations free with narrow size distribution. Using examples of two FCC and one BCC single-phase HEAs, it has been shown that large-scale nanocrystalline HEAs powder can be prepared after few hours of cryomilling at 123 K. The formation of nanocrystalline HEAs during cryomilling has been discussed using theoretically available approaches.
Highlights
The exploration of novel nanomaterials for various applications in the field of nano-science and nanotechnology has slowly been maturing with discovery of new and advanced materials
In the present investigation paper we demonstrate an scalable, cryomilling technique to prepare high entropy alloys nanoparticles (HEAs-NPs) in large quantity
The phase formation has been investigated after cryomilling of the High entropy alloys (HEAs) ingot
Summary
The exploration of novel nanomaterials for various applications in the field of nano-science and nanotechnology has slowly been maturing with discovery of new and advanced materials. It is well known that, the exceptional properties of nano-materials having surface area - to-volume ratio make these materials suitable for various applications [1], such as catalytic[2,3], optical [4,5], anti-bacterial [6,7], magnetic [8], biomedical applications [9] etc. In this regard, alloy nanoparticles found to exhibit exceptional properties for these applications due to the possibility of different combination of element being used. We require devising novel strategies to prepare these nanoparticles in large quantity
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