Time-temperature-transformation (TTT) diagram of caustic calcined magnesia

CIM Journal ◽  
2015 ◽  
Vol 6 (1) ◽  
pp. 42-50 ◽  
Author(s):  
K. Ebrahimi-Nasrabadi ◽  
M. Barati ◽  
P. W. Scott
Keyword(s):  
Ttt Diagram ◽  
Temperature Transformation

scholarly journals Ambient-temperature Conditioning as a Probe of Double-C Transformation Mechanisms in Pu-2.0 at. % Ga

2008 ◽  
Vol 1104 ◽  
Author(s):  
Jason R Jeffries ◽  
Kerri J. M. Blobaum ◽  
Mark A. Wall ◽  
Adam J. Schwartz
Keyword(s):  
Ttt Diagram ◽  
Optimal Conditioning ◽  
High Temperature Anneal ◽  
Conditioning Treatment ◽  
Conditioning Temperature ◽  
Δ Phase ◽  
Transformation Mechanisms ◽  
Temperature Transformation ◽  
Underlying Mechanisms ◽  
Kinetics Of

AbstractThe gallium-stabilized Pu-2.0 at. % Ga alloy undergoes a partial or incomplete low-temperature martensitic transformation from the metastable δ phase to the gallium-containing, monoclinic α′ phase near -100 °C. This transformation has been shown to occur isothermally and it displays anomalous double-C kinetics in a time-temperature-transformation (TTT) diagram, where two nose temperatures anchoring an upper- and lower-C describe minima in the time for the initiation of transformation. The underlying mechanisms responsible for the double-C behavior are currently unresolved, although recent experiments suggest that a conditioning treatment—wherein, following an anneal at 375 °C, the sample is held at a sub-anneal temperature for a period of time—significantly influences the upper-C of the TTT diagram. As such, elucidating the effects of the conditioning treatment upon the δ⟶α′ transformation can provide valuable insights into the fundamental mechanisms governing the double-C kinetics of the transition. Following a high-temperature anneal, a differential scanning calorimeter (DSC) was used to establish an optimal conditioning curve that depicts the amount of α′ formed during the transformation as a function of conditioning temperature for a specified time. With the optimal conditioning curve as a baseline, the DSC was used to explore the circumstances under which the effects of the conditioning treatment were destroyed, resulting in little or no transformation.

Formation and Properties of Thermosetting and High TgSystems

1989 ◽  
Vol 154 ◽  
Author(s):  
John K. Gillham
Keyword(s):  
Material Properties ◽  
Point Of View ◽  
Reaction Conditions ◽  
Ttt Diagram ◽  
Temperature Transformation ◽  
Polymeric Glasses ◽  
Generalized Time

AbstractA review of research in the author's laboratory on the conversion of reactive liquids to amorphous polymeric glasses is presented. Inter-relationships between reactants, reaction conditions, and subsequent material properties of thermosetting and high Tg polymers are discussed from the point of view of a generalized time-temperature-transformation (TTT) diagram.

scholarly journals Time-temperature-transformation (TTT) diagram of a dual-curable off-stoichiometric epoxy-amine system with latent reactivity

2018 ◽  
Vol 666 ◽  
pp. 124-134 ◽  
Author(s):  
Núria Areny ◽  
Osman Konuray ◽  
Xavier Fernàndez-Francos ◽  
Josep M. Salla ◽  
Josep M. Morancho ◽  
...  
Keyword(s):  
Ttt Diagram ◽  
Epoxy Amine ◽  
Amine System ◽  
Temperature Transformation

Enabling the Double-C Curve in Pu-Ga Alloy Time-Temperature-Transformation Diagrams

2008 ◽  
Vol 1104 ◽  
Author(s):  
Jason R. Jeffries ◽  
Kerri J. M. Blobaum ◽  
Mark A. Wall ◽  
Adam J. Schwartz
Keyword(s):  
Transformation Products ◽  
Isothermal Hold ◽  
Face Centered Cubic ◽  
Ambient Conditions ◽  
Unusual Behavior ◽  
Ttt Diagram ◽  
Δ Phase ◽  
The Face ◽  
Temperature Transformation ◽  
Transformation Diagrams

AbstractUnder ambient conditions, a Pu-2.0 at.% Ga alloy is retained in the metastable δ phase. Upon cooling to approximately -120 °C, the face-centered-cubic δ phase partially transforms to the metastable monoclinic α′ phase via a martensitic transformation. The kinetics of the δ⟶α′ transformation are reported to have double-C curve kinetics in a time-temperature-transformation (TTT) diagram, but the mechanisms responsible for this unusual behavior are not understood. Our work focuses on determining the underlying cause of the two noses. Optical microscopy has been used to investigate the role of “conditioning”—an isothermal hold at sub-anneal temperatures—on the δ⟶α′ transformation and to illuminate any disparities in transformation products. Conditioning was found to affect substantially the amount of transformation that occurs at particular points corresponding to both the upper- and lower-C of the TTT diagram.

scholarly journals Time-temperature-transformation (TTT) diagram of dual-curable epoxy thermosets obtained via two sequential epoxy-amine condensations

2019 ◽  
Vol 678 ◽  
pp. 178305 ◽  
Author(s):  
Osman Konuray ◽  
José M. Salla ◽  
José M. Morancho ◽  
Xavier Fernández-Francos ◽  
Montserrat García-Alvarez ◽  
...  
Keyword(s):  
Ttt Diagram ◽  
Epoxy Amine ◽  
Temperature Transformation
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