Speaker
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
No
Main supervisor (name and email)<br>and his / her institution
H.R Chauke, hr.chauke@ul.ac.za, University of Limpopo
Apply to be<br> considered for a student <br> award (Yes / No)?
yes
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
MSc
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Platinum group alloys, particularly the Pt3Al alloys are of importance in high temperature environment, such as aerospace and gas turbine. The Pt3Al exist in four phases that is L12, DOc, DOc′ and tP16; the L12 is stable at high temperatures (HT) and transforms to tetragonal phases at low temperature (LT). In particular, the cubic L12 Pt3Al is ductile but unstable, while the lower temperature (LT) phase which has the tetragonal lattice DOc′ is stable but brittle. However, the tetragonal tP16 is observed to be the ground-state structure at lower temperature. In this study, the relative phase transformation behaviour from L12 to tP16 and DOc′ has been investigated using Molecular Dynamics within the LAMMPS code. The calculated X-ray diffraction (XRD) pattern reveals a transformation trend from L12 to DOc′ and L12 to tP16 between 400K and 1300K. The observed L12 to DOc′ XRD peaks vanishes above 800K, while the L12 to tP16 peaks are observed above 1000K. This confirms that the DOc′ and L12 are stable below 800K and above 1000k, respectively. The L12 to tP16 transformation showed distinct XRD peaks above 800 K. The L12 XRD pattern are consistent with the experimental results, and also confirms that the tP16 phase is stable below 1000K.
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
NO
