Decomposition kinetics of the supersaturated solid solution in Al-Mg2Si alloys with scandium, zirconium, and hafnium additions

2014 ◽  
Vol 2014 (3) ◽  
pp. 229-233 ◽  
Author(s):  
L. L. Rokhlin ◽  
N. R. Bochvar ◽  
A. V. Sukhanov ◽  
N. P. Leonova
Keyword(s):  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
Decomposition Kinetics ◽  
Kinetics Of

Spinodal Decomposition in Fe-Cr Alloys

2011 ◽  
Vol 172-174 ◽  
pp. 443-448
Author(s):  
Orlando Soriano Vargas ◽  
Erika O. Avila Davila ◽  
Victor M. Lopez-Hirata ◽  
Maribel L. Saucedo-Muñoz
Keyword(s):  
Solid Solution ◽  
Mechanical Behavior ◽  
Spinodal Decomposition ◽  
Growth Kinetics ◽  
Supersaturated Solid Solution ◽  
Rich Phase ◽  
Hardening Behavior ◽  
Plate Shape ◽  
Kinetics Of ◽  
Preferential Alignment

The hardening behavior of precipitation was studied during aging of Fe-Cr alloys. This mechanical behavior is associated with the nanometric modulation structure of the coherent decomposed Fe-rich and Cr-rich phases formed by the spinodal decomposition of the supersaturated solid solution. The growth kinetics of spinodal decomposition was very slow and it increased during coarsening stage. The morphology of decomposed phases consisted of an interconnected irregular shape with no preferential alignment for short aging times and a further aging caused the change to a plate shape of the decomposed Cr-rich phase aligned in the <110> directions of the Fe-rich matrix. The rapid increase in hardness and embrittlement seem to be associated with the coherency and nanometer size of the spinodally-decomposed phases in the aged alloys.

On the Precipitation Behavior at 250 and 300 °C of WE54 Supersaturated Solid Solution

2012 ◽  
Vol 629 ◽  
pp. 85-89 ◽  
Author(s):  
S. Tighiouaret ◽  
H. Azzeddine ◽  
A. Sam ◽  
A. Sari ◽  
B. Alili ◽  
...  
Keyword(s):  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
Precipitation Sequence ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Precipitation Behavior ◽  
X Ray ◽  
The Mean ◽  
Kinetics Of

The current study seeks to further understand the precipitation sequence in a WE54 Mg alloy using in situ X-ray diffraction, micro-hardness and electrical resistivity during ageing at 250 and 300 °C. We show that the mean hardening effect is due to the precipitation of β' and β1metastable phases. The analysis of the kinetics of the precipitation shows that both phases nucleate at grain boundaries and within grains in the form of plates.

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