Early Stages of Decomposition in Ni-Rich Ni-Ti

1999 ◽  
Vol 580 ◽  
Author(s):  
M. Kompatscher ◽  
B. Demé ◽  
J. Hecht ◽  
H. Heinrich ◽  
J. Kohlbrecher ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Single Crystals ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Miscibility Gap ◽  
Early Stages

AbstractIn-situ small-angle neutron scattering was performed on Ni-(10 to 12) at.% Ti polycrystals and single crystals at temperatures between 870 and 1270 K. During decomposition metastable precipitates of cuboidal shape form with preferred alignement along <100>. The Ti concentration of these precipitates is 17(1) at.% (between 870 and 950 K). Metastable precipitates precede the formation of platelets of the stable η phase even outside the hitherto accepted metastable miscibility gap.

Fractal morphologies from decomposition of Fe−Ni−Invar alloys

1997 ◽  
Vol 12 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Q. Li ◽  
A. Wiedenmann ◽  
H. Wollenberger
Keyword(s):  
Neutron Scattering ◽  
Spinodal Decomposition ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Miscibility Gap ◽  
Early Stages ◽  
Invar Alloys ◽  
Precipitated Phase

Small angle neutron scattering investigations performed on Fe1−x–Nix alloys with 0.26 ≤ x ≤ 0.45 revealed a thermodynamically driven decomposition below 800 °C. The miscibility gap extends at least from 30 at.% Ni to 45 at.% Ni. The diffusioncontrolled decomposition produces fractal morphologies during the early stages of the process. During annealing the structure of the precipitated phase densifies continuously from mass fractals with small dimensionality (1 ≤ dm ≤ 3) to surface fractals with 2 ≤ ds ≤ 3. The results are compared with recent simulations of aggregation and growth as well as with a new analysis of spinodal decomposition, both predicting fractal morphologies.

scholarly journals Early stages of spinodal decomposition in Fe–Cr resolved by in-situ small-angle neutron scattering

2015 ◽  
Vol 106 (6) ◽  
pp. 061911 ◽  
Author(s):  
M. Hörnqvist ◽  
M. Thuvander ◽  
A. Steuwer ◽  
S. King ◽  
J. Odqvist ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Spinodal Decomposition ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Early Stages

An in situ small angle neutron scattering study of expanded graphite under a uniaxial stress

Carbon ◽  
2013 ◽  
Vol 57 ◽  
pp. 460-469 ◽  
Author(s):  
Félix Balima ◽  
Vittoria Pischedda ◽  
Sylvie Le Floch ◽  
Annie Brûlet ◽  
Peter Lindner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Expanded Graphite ◽  
Uniaxial Stress ◽  
Scattering Study ◽  
Neutron Scattering Study
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