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

doi:10.1166/nnl.2015.1999

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

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15 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 language	English
Pages (from-to)	603-610
Journal	Nanoscience and Nanotechnology Letters
Volume	7
Issue number	7
DOIs	https://doi.org/10.1166/nnl.2015.1999
Publication status	Published - Jul 2015

Keywords

Gas Atomization
microstructure
TiAl Alloy
nucleation
cooling rate

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

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.",

keywords = "Gas Atomization, microstructure, TiAl Alloy, nucleation, cooling rate",

author = "Dong-Ye Yang and Hua-Xin Peng and Fu, \{Yong Qing\} and Fu-Yang Cao and Zhi-Liang Ning and Shu Guo and Yan-Dong Jia and Na Liu and Jian-Fei Sun",

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doi = "10.1166/nnl.2015.1999",

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TY - JOUR

T1 - Nucleation on Thermal History and Microstructural Evolution of Atomized Ti-48Al Nano and Micro-Powders

AU - Yang, Dong-Ye

AU - Peng, Hua-Xin

AU - Fu, Yong Qing

AU - Cao, Fu-Yang

AU - Ning, Zhi-Liang

AU - Guo, Shu

AU - Jia, Yan-Dong

AU - Liu, Na

AU - Sun, Jian-Fei

PY - 2015/7

Y1 - 2015/7

N2 - 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.

AB - 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.

KW - Gas Atomization

KW - microstructure

KW - TiAl Alloy

KW - nucleation

KW - cooling rate

UR - https://www.scopus.com/pages/publications/84939154639

U2 - 10.1166/nnl.2015.1999

DO - 10.1166/nnl.2015.1999

M3 - Article

SN - 1941-4900

VL - 7

SP - 603

EP - 610

JO - Nanoscience and Nanotechnology Letters

JF - Nanoscience and Nanotechnology Letters

IS - 7

ER -

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

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Keywords

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