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The influence of the direct quench and indirect quench to T a > T h on the decomposition behaviour of an Al‐2 at.% Zn‐1 at.% Mg alloy
Author(s) -
Wolter R.,
Fabian H.G.,
Czurratis P.,
Kroggel R.
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250416
Subject(s) - isothermal process , nucleation , thermodynamics , decomposition , precipitation , homogeneous , materials science , electrical resistivity and conductivity , alloy , chemistry , analytical chemistry (journal) , metallurgy , physics , chromatography , organic chemistry , quantum mechanics , meteorology
The decomposition behaviour of an Al‐2.0 at.% Zn‐1.0 at.% Mg alloy after direct quench (DQ) and indirect quench (IQ: T a 1= 23 °C, t a 1 ) to the ageing temperature T a 2= 160 °C (above the temperature of the rapid homogeneous nucleation, T h ) was investigated by means of TEM and isothermal resistivity measurements. The precipitation density of the η‐particles yields a maximum value at pre‐ageing times about 10 min at T a 1= 23 °C. To clear up the reason for that phenomenon a loop‐formation and clustering model was introduced.