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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Microstructural Characterization of Al0.5CrFeNiTi High Entropy Alloy Produced by Powder Metallurgy Route.

Laura Elena Geambazu1,2, Dorinel Tălpeanu2, Robert Viorel Bololoi1

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

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

This study produced Al0.5CrFeNiTi alloy powder using mechanical alloying. The resulting alloy exhibited a refined particle size and a homogenous composition, suitable for further processing into advanced materials.

Keywords:
high entropy alloysmechanical alloyingmicrostructural characterizationpowder metallurgy route

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-State Chemistry

Background:

  • Advanced alloys are crucial for enhancing equipment lifespan and reducing maintenance costs.
  • Applications span diverse high-performance sectors including geothermal, marine, and aerospace engineering.
  • The development of novel alloy compositions with superior properties is an active area of research.

Purpose of the Study:

  • To synthesize the Al0.5CrFeNiTi alloy via solid-state processing.
  • To achieve a high degree of alloying and a homogenous composition in the powder.
  • To prepare the alloy for subsequent pressing and sintering.

Main Methods:

  • Solid-state processing utilizing a planetary ball mill for mechanical alloying.
  • Technological characterization of the metallic powder.
  • Microstructural analysis to assess alloying evolution and structural integrity.
  • X-ray diffraction (XRD) for phase identification.

Main Results:

  • Mechanical alloying significantly reduced particle size compared to raw elemental powders.
  • Microstructural analysis revealed a homogenous composition and a defect-free compact structure in pressed and sintered samples.
  • XRD confirmed the presence of face-centered cubic (FCC), body-centered cubic (BCC), and hexagonal close-packed (HCP) phases, consistent with theoretical predictions.

Conclusions:

  • The mechanical alloying process effectively produced a homogenous Al0.5CrFeNiTi alloy powder.
  • The pressed and sintered bulk material demonstrated a desirable compact structure.
  • The identified crystalline phases (FCC, BCC, HCP) indicate successful alloy formation with potential for advanced applications.