Journal of Ultrafine Grained and Nanostructured Materials

Journal of Ultrafine Grained and Nanostructured Materials

Nanostructured high-entropy alloys by mechanical alloying: A review of principles and magnetic properties

Document Type : Review Paper

Authors
Sara Daryoush
Hamed Mirzadeh
Abolghasem Ataie
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
10.22059/jufgnsm.2021.01.12
Abstract
The principles and magnetic properties of nanostructured high-entropy alloys (HEAs) processed by mechanical alloying are overviewed. Firstly, the general concepts of HEAs (multi-principal element alloys with ≥5 elements) and phase formation rules are briefly reviewed. Subsequently, the processing of nanocrystalline and amorphous HEAs by mechanical alloying and the effect of high-energy ball milling parameters are summarized. Finally, the magnetic properties of nanostructured HEAs are critically discussed to infer some general rules. In summary, a higher content of ferromagnetic elements (e.g. Fe, Co, and Ni) normally results in a higher saturation magnetization. The as-milled products with solid solution phases show better soft-magnetic properties compared to the fully amorphous phases, and increasing the amount of the amorphous phase decreases the saturation magnetization. The magnetic properties are also influenced by processing (such as sintering) and thermal history through the alteration of phases and crystallite size.
Keywords
High-entropy alloys
Mechanical alloying
Magnetic properties
Nanostructures
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Journal of Ultrafine Grained and Nanostructured Materials
Volume 54, Issue 1
June 2021
Pages 112-120

  • Receive Date 30 March 2021
  • Revise Date 29 April 2021
  • Accept Date 11 May 2021