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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Solid-State Processing of CoCrMoNbTi High-Entropy Alloy for Biomedical Applications.

Alina Elena Bololoi1, Laura Elena Geambazu1,2, Iulian Vasile Antoniac1

  • 1Materials Science and Engineering Faculty, National University of Science and Technology Politehnica Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania.

Materials (Basel, Switzerland)
|October 14, 2023
PubMed
Summary

High-entropy alloys (HEAs) show promise for biomedical uses, offering superior biocompatibility and mechanical properties. This study details the development and characterization of a novel bio-HEA powder with potential for advanced medical applications.

Keywords:
CoCrMoNbTibiomaterialbiomedicalhigh-entropy alloysmechanical alloying

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Metallurgy

Background:

  • High-entropy alloys (HEAs) are emerging materials with unique properties derived from their multi-elemental composition.
  • Biocompatibility is a critical requirement for biomedical applications, driving research into novel alloy systems.
  • Existing biomedical materials may have limitations that HEAs could potentially overcome.

Purpose of the Study:

  • To investigate the potential of a biocompatible high-entropy alloy (bio-HEA) as an alternative to current biomedical materials.
  • To characterize the structural, microstructural, and technological properties of a developed bio-HEA powder.
  • To confirm the formation of desired phases and assess the suitability of the powder for biomedical applications.

Main Methods:

  • Computational prediction of phase formation based on valence electron concentration.
  • X-ray diffraction (XRD) analysis to identify crystalline phases.
  • Microstructural and compositional analysis using advanced imaging and mapping techniques.
  • Technological characterization, including particle size analysis, of the mechanically alloyed powder.

Main Results:

  • The study expected and confirmed the presence of body-centered cubic (BCC) and tetragonal (TVC) phases, correlating with high strength, plasticity, and ductility.
  • Microstructural analysis revealed uniform and refined metallic powder particles, indicating successful alloying.
  • Elemental mapping confirmed homogeneous distribution, signifying effective elemental mixing during the alloying process.
  • Mechanical alloying resulted in particle size reduction, with an average particle size of 45.12 µm.

Conclusions:

  • The developed bio-HEA exhibits promising properties, including a favorable phase composition (BCC and TVC) and good microstructural characteristics.
  • The homogeneous elemental distribution and refined particle size suggest successful synthesis and suitability for further processing.
  • This bio-HEA presents a viable alternative to conventional biomedical materials, warranting further investigation for clinical applications.