Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets
An analytical approach was developed to investigate nucleation and growth of Ti-48Al (atom fraction/%) alloy droplets during their flight in an argon atomization process. Evolution of microstructure of the solidified powders was investigated by scanning electron microscopy (SEM), transmission electr...
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doaj-3b17fd484fd045f59f631c785e7179f32020-11-25T02:00:24ZzhoJournal of Materials EngineeringJournal of Materials Engineering1001-43811001-43812018-12-01461211712310.11868/j.issn.1001-4381.2016.000570201812000570Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy DropletsBAO Ying0LUO Lin1YU Ze-min2YANG Dong-ye3LIU Na4ZHANG Guo-qing5SUN Jian-fei6School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150080, ChinaSchool of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150080, ChinaSchool of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150080, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaScience and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaScience and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaAn analytical approach was developed to investigate nucleation and growth of Ti-48Al (atom fraction/%) alloy droplets during their flight in an argon atomization process. Evolution of microstructure of the solidified powders was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron back-scatter diffraction (EBSD). Newton cooling model based on the initial number of nuclei, liquid/solid interface velocity, cooling rate and size of droplets was established. The results show that statistical nucleation events increase exponentially with the increase of powders size, and the growth of nuclei is transformed from a twinned spherical segment into a concentric liquid/solid interface geometry. Temperature of atomized droplets decreases rapidly with the cooling rate of 10<sup>5</sup>-10<sup>6</sup>K·s<sup>-1</sup>.Then temperature increases sharply to near the liquidus temperature during recalescence. When the recalescence is completed, the droplet solidifies at a relatively slower rate. Afterwards the cooling rate of the fully solid phase decreases to about 10<sup>5</sup>K·s<sup>-1</sup>.http://jme.biam.ac.cn/CN/Y2018/V46/I12/117TiAl alloygas atomizationrapid solidificationmicrostructurenucleationcooling rate |
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DOAJ |
language |
zho |
format |
Article |
sources |
DOAJ |
author |
BAO Ying LUO Lin YU Ze-min YANG Dong-ye LIU Na ZHANG Guo-qing SUN Jian-fei |
spellingShingle |
BAO Ying LUO Lin YU Ze-min YANG Dong-ye LIU Na ZHANG Guo-qing SUN Jian-fei Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets Journal of Materials Engineering TiAl alloy gas atomization rapid solidification microstructure nucleation cooling rate |
author_facet |
BAO Ying LUO Lin YU Ze-min YANG Dong-ye LIU Na ZHANG Guo-qing SUN Jian-fei |
author_sort |
BAO Ying |
title |
Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets |
title_short |
Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets |
title_full |
Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets |
title_fullStr |
Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets |
title_full_unstemmed |
Rapid Cooling and Solidification Microstructure of Argon Atomized Ti-48Al Alloy Droplets |
title_sort |
rapid cooling and solidification microstructure of argon atomized ti-48al alloy droplets |
publisher |
Journal of Materials Engineering |
series |
Journal of Materials Engineering |
issn |
1001-4381 1001-4381 |
publishDate |
2018-12-01 |
description |
An analytical approach was developed to investigate nucleation and growth of Ti-48Al (atom fraction/%) alloy droplets during their flight in an argon atomization process. Evolution of microstructure of the solidified powders was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron back-scatter diffraction (EBSD). Newton cooling model based on the initial number of nuclei, liquid/solid interface velocity, cooling rate and size of droplets was established. The results show that statistical nucleation events increase exponentially with the increase of powders size, and the growth of nuclei is transformed from a twinned spherical segment into a concentric liquid/solid interface geometry. Temperature of atomized droplets decreases rapidly with the cooling rate of 10<sup>5</sup>-10<sup>6</sup>K·s<sup>-1</sup>.Then temperature increases sharply to near the liquidus temperature during recalescence. When the recalescence is completed, the droplet solidifies at a relatively slower rate. Afterwards the cooling rate of the fully solid phase decreases to about 10<sup>5</sup>K·s<sup>-1</sup>. |
topic |
TiAl alloy gas atomization rapid solidification microstructure nucleation cooling rate |
url |
http://jme.biam.ac.cn/CN/Y2018/V46/I12/117 |
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