Time-resolved x-ray microdiffraction studies of phase transformations during rapidly propagating reactions in Al/Ni and Zr/Ni multilayer foils

2010 ◽  
Vol 107 (11) ◽  
pp. 113511 ◽  
Author(s):  
J. C. Trenkle ◽  
L. J. Koerner ◽  
M. W. Tate ◽  
Noël Walker ◽  
S. M. Gruner ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Time Resolved ◽  
X Ray ◽  
Multilayer Foils

scholarly journals Phase Transformations in Cu-Zr Multilayers

1993 ◽  
Vol 311 ◽  
Author(s):  
T.T. Weihs ◽  
T.T. Barbee ◽  
M.M. Wall
Keyword(s):  
Phase Transformations ◽  
Equilibrium Phase ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Multilayer Foils ◽  
Short Range Ordering ◽  
Magnetron Sputter Deposition ◽  
Magnetron Sputter ◽  
Long Range Ordering ◽  
Zr Alloys

ABSTRACTA study of phase transformations is reported for Cu-rich, Cu-Zr multilayer foils that were synthesized using magnetron sputter deposition and annealed using a differential scanning calorimeter. The foils range in composition from 1.6 at% to 9.0 at% Zr and consist of alternate layers of polycrystalline Cu and Zr. Differential scanning calorimetry, X-ray analysis and electron microscopy were used to examine three distinct reactions in the foils: a mixing and an amorphization of the Cu and the Zr, a crystallization to the metastable intermetallic, Cu51Zr14, and a transformation of the Cu51Zr14 phase into the equilibrium phase, Cu9Zr2. The asdeposited layering remained stable during the first two reactions and then broke down in the third reaction as large grains of Cu9Zr2 encompassed the smaller Cu grains. The heats of the reactions and the activation energies of these reactions are measured and are compared to values reported for bulk samples. The measured heats support the observation that amorphous Cu-Zr alloys phase separate and provide evidence that mixing and short range ordering produce 3.5 times more heat than long range ordering when Cu and Zr react and form Cu51Zr14.

Kinetics of high-pressure mineral phase transformations using in situ time-resolved X-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and treatment

2008 ◽  
Vol 72 (2) ◽  
pp. 683-695 ◽  
Author(s):  
J. P. Perrillat
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Kinetic Studies ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Practical Guide ◽  
Set Up ◽  
Isothermal Kinetic

AbstractSynchrotron X-ray diffraction (XRD) is a powerful technique to study in situ and in real-time the structural and kinetic processes of pressure-induced phase transformations. This paper presents the experimental set-up developed at beamline ID27 of the ESRF to perform time-resolved angle dispersive XRD in the Paris-Edinburgh cell. It provides a practical guide for the acquisition of isobaric-isothermal kinetic data and the construction of transformation-time plots. The interpretation of experimental data in terms of reaction mechanisms and transformation rates is supported by an overview of the kinetic theory of solid-solid transformations, with each step of data processing illustrated by experimental results of relevance to the geosciences. Reaction kinetics may be affected by several factors such as the sample microstructure, impurities or differential stress. Further high-pressure kinetic studies should investigate the influence of such processes, in order to acquire kinetic information more akin to natural or technological processes.

Time resolved X-ray diffraction observations of phase transformations in transient arc welds

2008 ◽  
Vol 13 (3) ◽  
pp. 265-277 ◽  
Author(s):  
J. W. Elmer ◽  
T. A. Palmer ◽  
W. Zhang ◽  
T. DebRoy
Keyword(s):  
Phase Transformations ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray
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