Solidification Behavior of Ge–Al Eutectic Alloy in a Drop Tube

Drop tube processing was used to study rapid solidification of Ge – Al eutectic system. Liquid droplets with diameters in the range of 100 – 900 μm were undercooled and containerlessly solidified in an 8 m drop tube. The cooling rate which plays a dominant role in structural morphology is estimated....

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Bibliographic Details
Published inTransactions of the Indian Institute of Metals Vol. 69; no. 4; pp. 961 - 970
Main Authors Erol, Mustafa, Büyük, Uğur
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.05.2016
Subjects
Chemistry and Materials Science
Corrosion and Coatings
Materials Science
Metallic Materials
Technical Paper
Tribology
Drop tube
Al alloy
Cooling rate
Microhardness
Ge
Containerless solidification
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Summary:Drop tube processing was used to study rapid solidification of Ge – Al eutectic system. Liquid droplets with diameters in the range of 100 – 900 μm were undercooled and containerlessly solidified in an 8 m drop tube. The cooling rate which plays a dominant role in structural morphology is estimated. The smaller the diameters of the droplets, the higher the undercooling and cooling rates. The eutectic reaction: L → α(Al) + β(Ge) was verified. Droplets larger than 500 μm in diameter exhibited a complete coarse lamellar eutectics and regular dendritic structures. With the decreasing of the droplet size, lamellar eutectic to anomalous eutectic morphology transition took place. It was also proved that, higher undercooling caused lower eutectic spacing which affected the mechanical characteristics of materials like microhardness.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-015-0592-y