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

Yang, Dong-Ye, Peng, Hua-Xin, Fu, Yong Qing, Cao, Fu-Yang, Ning, Zhi-Liang, Guo, Shu, Jia, Yan-Dong, Liu, Na and Sun, Jian-Fei (2015) Nucleation on Thermal History and Microstructural Evolution of Atomized Ti-48Al Nano and Micro-Powders. Nanoscience and Nanotechnology Letters, 7 (7). pp. 603-610. ISSN 1941-4900

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Official URL: http://dx.doi.org/10.1166/nnl.2015.1999

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.

Item Type: Article
Uncontrolled Keywords: Gas Atomization, microstructure, TiAl Alloy, nucleation, cooling rate
Subjects: F200 Materials Science
F300 Physics
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Nicola King
Date Deposited: 26 Oct 2015 16:33
Last Modified: 03 Nov 2016 14:46
URI: http://nrl.northumbria.ac.uk/id/eprint/24146

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