Nucleation on Thermal History and Microstructural Evolution of Atomized Ti-48Al Nano and Micro-Powders

Dong-Ye Yang, Hua-Xin Peng, Yong Qing Fu, Fu-Yang Cao, Zhi-Liang Ning, Shu Guo, Yan-Dong Jia, Na Liu, Jian-Fei Sun

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

An analytical approach was developed to investigate nucleation, recalescence and growth of Ti-48Al (at.%) alloy droplets during their flight in a gas atomization process. Evolution of microstructure of the solidified powders was quantitatively investigated using scanning electron microscopy, transmission electron microscopy and electron back-scatter diffraction. Relationships among the initial number of nuclei, liquid/solid interface velocity and cooling rate have been established. Results showed that statistical nucleation events increased exponentially with increasing droplet size, and the powder microstructures were transformed from a twinned spherical segment into a concentric liquid/solid interface geometry. Variations of initial temperature, cooling rate and solid fraction of the droplets as a function of cooling durations for the droplets with various sizes were investigated.
Original languageEnglish
Pages (from-to)603-610
JournalNanoscience and Nanotechnology Letters
Volume7
Issue number7
DOIs
Publication statusPublished - Jul 2015

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