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On the decomposition behaviour of supersaturated Al‐Zn‐Mg alloys in dependence on heat treatment
Author(s) -
Löffler H.,
Korngiebel E.,
Gerlach R.
Publication year - 1981
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19810160414
Subject(s) - nucleation , supersaturation , decomposition , homogeneous , thermodynamics , materials science , vacancy defect , chemistry , crystallography , physics , organic chemistry
The influence of the various heat treatments applied on the decomposition processes taking place in some Al‐Zn‐Mg alloys (varying in Zn as well as Mg content) are discussed based on the main assumptions that 1) the upper limit of the temperatur of homogeneous nucleation, T hn , plays an important role on the kind of nucleation taking place at the aging temperature, T a , and 2) vacancy‐rich clusters, VRC, as well as overcritical GP zones can act as nucleation sites for η′;‐particles at T a > T hn . The influence of the VRC is decreasing with rise of the Zn‐content.