| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
|
Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
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| Presentation Title |
A Precise DSC-based Methodology to Pinpoint <i>in situ</i> Crystallinity Percent in Amorphous Systems |
| Author(s) |
Olivia A. Graeve, Arash Yazdani, Günther W.H. Höhne, Darren Dewitt, Javier E. Garay |
| On-Site Speaker (Planned) |
Olivia A. Graeve |
| Abstract Scope |
An understanding of the crystallization of amorphous materials is of critical importance, since devitrification products and kinetics strongly affect the properties of the resulting materials. However, there are some amorphous systems whose crystallization behavior cannot be quantified by conventional methods such as X-ray diffraction and scanning/transmission electron microscopy. We have developed a differential scanning calorimetry (DSC) methodology to calculate the change in crystallinity and crystallinity percentage as a function of temperature in amorphous systems. By comparing the enthalpies of amorphous, crystalline and partially devitrified samples, we implemented a mathematical description. We have succeeded in measuring crystallinity percentages as small as 5% with an uncertainty of 1.6% for amorphous steels. This novel method can also deliver crystallinity information without the use of expensive and high maintenance in situ accessories. A comparative analysis between percent crystallinity and the microstructure from samples prepared by spark plasma sintering will also be described. |
| Proceedings Inclusion? |
Undecided |