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Influence of the quenched‐in state on the decomposition kinetics of Al‐21 at.% ZnX at.% Mn Alloys
Author(s) -
Wendrock G.,
Major B.,
Löffler H.,
Ciach R.,
Król J.
Publication year - 1988
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.2170231036
Subject(s) - lamellar structure , nucleation , quenching (fluorescence) , decomposition , crystallography , homogeneous , kinetics , materials science , scattering , diffraction , phase (matter) , chemistry , analytical chemistry (journal) , thermodynamics , physics , optics , fluorescence , chromatography , quantum mechanics , organic chemistry
The structure changes proceeding in a series of Al‐21 at.% Zn‐ X at.% Mn alloys ( X = 0, 0.13, 0.32, 0.6, and 2.0) were investigated during ageing at 80 °C by X‐ray (diffraction line analysis as well as small‐angle scattering) and TEM examinations. The main results are the following. (i) Mn additions of 0.6 at.% rise the boundary of the one phase region ( T PB ) for about 50 K. (ii) Mn additions accelerate the lamellar mode of decomposition, the mean size of the GP zones, however, is profoundly diminished. (iii) If quenching the specimens from T q = T rhn + 15 K < T PB ( T rhn is the upper limit temperature of the onset of rapid homogeneous nucleation of Guinier‐Preston (GP) zones) instead from T q = 470 °C > T PB , the lamellar mode of decomposition is significantly accelerated, but the mean size of the GP zones growing between the lamellas is diminished.