Landolt-Börnstein - Group III Condensed Matter

2.6.1 Special remarks

Abstract

This chapter discusses special remarks of concentrated alloys. The discussion of interstitial atoms and vacancies in metallic alloys considers solid solutions as well as alloys that show long range order in the temperature range under investigation. Long range order is characterized by the possibility to define different sublattices for the different kinds of atoms. Solid solutions show in general some deviation from a random distribution of the atoms at low temperatures and will refer to these alloys as short range ordering alloys using the more general meaning of short range ordering that includes short range ordering as well as short range decomposition. Long range ordering alloys have been employed in the study of radiation damage mechanisms almost from the very beginning, because atomic rearrangements can be observed very sensitively. In a binary AB-alloy there may be different interstitial atoms. Schematic view of a Ni3Fe lattice that shows various possible interstitial defect configurations is illustrated. The migration of the defects may be different on different sublattices of an ordered alloy. The mobilities of the SIA have been deduced from low temperature irradiation experiments similar to those of the pure metals. Comparison of the sizes of clusters of interstitial atoms in pure Ni and the concentrated Ni-base alloys Ni3Fe and NiCu is illustrated. With increasing temperature there is close pair annealing, interstitial long range migration and finally vacancy migration.

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Title
2.6.1 Special remarks
Book Title
Atomic Defects in Metals
In
2.6 Concentrated alloys
Book DOI
10.1007/b37800
Chapter DOI
10.1007/10011948_87
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
25
Editors
  • H. Ullmaier
  • Authors
  • P. Ehrhart
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