Landolt-Börnstein - Group III Condensed Matter

Atomic Defects in Metals · Cu-Zn

Abstract

This chapter discusses the properties of atomic defects in CuxZn1-x alloy. Isochronal annealing of α-CuZn and β-CuZn alloy after low temperature irradiation with electrons as well as neutrons are illustrated. From the superannealing below 150K there is evidence for SIA migration by the interstitialcy mechanism at that temperature. Vacancy migration leads to further changes of the SRO and the migration temperature of 250-300 K has been supported by quenching experiments and by PAS. The change of SRO due to defect migration depends strongly on the sink density. The release of stored energy after plastic deformation is illustrated and compared to pure Cu. The evolution of the resistivity depends strongly on the pre-quenching treatment of the specimen. Vacancy formation energies have been investigated by PAS over a wide concentration range of the α-phase and the β-phase. From the onset temperature of positron trapping effective values for HF have been estimated and there is agreement that HF decreases with increasing Zn content. β-CuZn has been investigated by resistivity measurements after low temperature e--irradiation and after quenching. There is good agreement between the PAS results on the vacancy formation energies in the α-phase there are differences in the experimental results and the interpretation concerning the β-phase, e.g. there is evidence reported for an increase of HF with increasing order parameter S, and very different formation energies are deduced for the Cu (0.58 eV) and the Zn (0.77 eV) sublattice.

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Title
Atomic Defects in Metals · Cu-Zn
Book Title
Atomic Defects in Metals
In
2.6.2 Data
Book DOI
10.1007/b37800
Chapter DOI
10.1007/10011948_100
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
25
Editors
  • H. Ullmaier
  • Authors
  • P. Ehrhart
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