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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.
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Isomerism in Complexes
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Polymorphism in a high-entropy alloy.

Fei Zhang1,2, Yuan Wu1, Hongbo Lou2

  • 1State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.

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|June 2, 2017
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Summary
This summary is machine-generated.

Polymorphism is possible in high-entropy alloys. The study reveals an irreversible structural transition from face-centered-cubic to hexagonal-close-packed in CoCrFeMnNi alloy under pressure.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Crystallography

Background:

  • Polymorphism, the existence of different crystal structures, is crucial in materials science.
  • High-entropy alloys (HEAs) exhibit exceptional structural stability due to engineered configuration disorder.
  • The possibility of polymorphism in these stable HEAs remains an open question.

Purpose of the Study:

  • To investigate the potential for polymorphism in high-entropy alloys.
  • To explore structural transitions in the prototype CoCrFeMnNi high-entropy alloy under varying pressure and temperature conditions.

Main Methods:

  • In situ high-pressure synchrotron radiation X-ray diffraction was used to observe structural changes.
  • In situ high-temperature synchrotron radiation X-ray diffraction was employed to study phase stability.
  • Analysis focused on the transformation between face-centered-cubic (fcc) and hexagonal-close-packing (hcp) structures.

Main Results:

  • A polymorphic transition from face-centered-cubic (fcc) to hexagonal-close-packing (hcp) structure was observed in the CoCrFeMnNi high-entropy alloy.
  • This fcc-to-hcp transition was found to be irreversible.
  • The fcc phase is stable at high temperatures, while the hcp phase is favored at lower temperatures, with the transformation temperature increasing with pressure.

Conclusions:

  • High-entropy alloys can exhibit polymorphism, challenging previous assumptions about their inherent stability.
  • The observed irreversible transformation highlights the complex phase behavior of HEAs under external stimuli.
  • Understanding these polymorphic transitions is key to tailoring HEA properties for specific applications.