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Journal of Materials Science
Erschienen in: Journal of Materials Science 9/2020

06.12.2019 | Metals & corrosion

Rapid solidification of a FeSi intermetallic compound in undercooled melts: dendrite growth and microstructure transitions

verfasst von: Jianbao Zhang, Fan Zhang, Xuan Luo, Qing Zhou, Haifeng Wang

Erschienen in: Journal of Materials Science | Ausgabe 9/2020

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Abstract

Rapid solidification of a FeSi stoichiometric intermetallic compound was studied using the glass fluxing method. The recalescence process was in situ observed for the first time by the infrared high-speed high-resolution cameras. The dendrite envelope was found to be non-isothermal during the recalescence process. The growth velocity increased first, then decreased and finally held nearly constant. The average dendrite growth velocity for the recalescence process increased monotonically with undercooling and was described well by the dendrite growth model for a stoichiometric intermetallic compound. At low undercooling, the microstructure transition from coarse dendrites to refined grains was consistent with the dendrite fragmentation model and the chemical superheating model. At high undercooling, dendrite deformation triggers stress accumulation upon rapid solidification, thus providing the driving force for recrystallization. However, there were no evidences for annealing twins accompanied by recrystallization as well as random textures due to recrystallization nucleation. From the local misorientation map, the grain refinement mechanism was suggested to be stress-induced dendrite fragmentation. This study is helpful for not only understanding the intrinsic mechanisms of microstructure transitions in theory but also controlling microstructures and performance of intermetallic compounds in practical applications.
Vorheriger Artikel Measurements of thermophysical properties of solid and liquid NIST SRM 316L stainless steel
Nächster Artikel Magnetic bacterial cellulose and carbon nanofiber aerogel by simple immersion and pyrolysis

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Fußnoten
1
The transition from dendrite to dendritic seaweed was also reported for rapid solidification of Ni3Ge intermetallic compound processed by drop-tube [33‐35].
 
2
The compound FeSi crystallizes in cubic B20 structure, and the corresponding space group is P213. Each primitive unit cell in the B20 structure contains eight atoms (four Fe atoms and four Si atoms), and any one of the atoms is surrounded by seven nearest neighbor atoms of the opposite element. Both Fe and Si atoms occupy the Wyckoff position of 4a (x, x, x). The coordinates of the position are (u, u, u), (0.5 + u, 0.5 − u, −u), (−u, 0.5 + u, 0.5 − u), (0.5 − u, −u, 0.5 − u), where uFe = 0.173a and uSi = 0.842a with a = 449 pm [38].
 
3
This camera is equipped with a refrigerated mercury cadmium telluride detector with the ability to produce a clear thermal image of 640 × 512 pixels and a temperature difference of less than 25 mK.
 
4
The second recalescence event is so weak that it cannot be captured by the high-speed cameras.
 
5
Because we aim to study grain refinement mechanisms and dendrite growth kinetics of the FeSi intermetallic compound, further identifying the crystal structure of the secondary phase is not shown here.
 
6
It should be noted that the thermal undercooling ΔTT adopted here is for an isothermal dendrite under a steady-state condition. The dendrite envelope recorded by the infrared high-speed camera shows that it is under a non-steady-state condition and is a non-isothermal one; see Fig. 4.
 
7
\( \Delta t_{\text{pl}} \) is defined in the cooling curves as the time difference between the highest recalescence temperature and the inflection point after recalescence. It should be noted that if the overall solidification is adopted, the cooling history can be predicted, according to which \( \Delta t_{\text{pl}} \) can be obtained theoretically [22]. In this case, dendrite fragmentation in undercooled melts can be described in a self-consistent way.
 
8
A plenty of sub-grains were also found within the coarse grains for rapid solidification in an undercooled CoNi equiatomic alloy [55].
 
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Metadaten
Titel
Rapid solidification of a FeSi intermetallic compound in undercooled melts: dendrite growth and microstructure transitions
verfasst von
Jianbao Zhang
Fan Zhang
Xuan Luo
Qing Zhou
Haifeng Wang
Publikationsdatum
06.12.2019
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 9/2020
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-04265-2

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