Complex metallic alloys

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Complex metallic alloys (CMAs) of complex intermetallics (CIMs) are intermetallic compounds characterized by the following structural features:

  1. large unit cells, comprising some tens up to thousands of atoms,
  2. the presence of well-defined atom clusters, frequently of icosahedral point group symmetry,
  3. the occurrence of inherent disorder in the ideal structure.

Research[edit]

Most physical properties of CMAs show distinct differences with respect to the behaviour of normal metallic alloys and therefore these materials possess a high potential for technological application.

The European Commission funded the Network of Excellence CMA [1] from 2005 to 2010, uniting 19 core groups in 12 countries. From this emerged the European Integrated Center for the Development of New Metallic Alloys and Compounds C-MAC [2], which connects researchers at 21 universities.

Examples[edit]

Example phases are:

  • β-AlMg: 1168 atoms per unit cell, face centred cubic, atoms arranged in Friauf polyhedra.
  • ξ'–Al–PdMn: 318 atoms per unit cell, face centred orthorhombic, atoms arranged in Mackay-type clusters.
  • T–Mg–Al–Zn (Bergman phase): 163 atoms per unit cell, body centred cubic, atoms arranged in Bergman clusters.
  • T–Al3Mn (Taylor phase): 204 atoms per unit cell, face centred orthorohombic, atoms arranged in Mackay-type clusters.

Further reading[edit]

  • Urban, Knut; Feuerbacher, Michael. "Structurally complex alloy phases". Journal of Non-Crystalline Solids. Elsevier B.V. 334–335: 143–150. Bibcode:2004JNCS..334..143U. doi:10.1016/j.jnoncrysol.2003.11.029.
  • Dubois, Jean-Marie; Belin-Ferré, Esther, eds. (2011). Complex Metallic Alloys: Fundamentals and Applications. Wiley-VCH. doi:10.1002/9783527632718. ISBN 978-3-527-32523-8.

External links[edit]

  1. EC Network of Excellence Complex Metallic Alloys