Effect of Undercooling on the Microstructure and Mechanical Properties of Hyper-eutectic Ni–Sn Alloy

In this study, container-less solidification of hyper-eutectic Ni–Sn alloy has been performed by using the electromagnetic levitation technique. The effect of undercooling on the formed microstructure and on the mechanical properties have been investigated. Growth velocities were determined by high-...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2023-11, Vol.54 (11), p.4387-4395
Main Authors: Munawar, Ahmed, Sadeeda, Asif, Varda, Jafri, Ali, Nisar, Fatima, Wegener, Mareike, Su, Jing, Kargl, Florian
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling
Eutectic alloys
Eutectics
Lamellar structure
Load
Magnetic levitation
Materials Science
Mechanical properties
Metallic Materials
Microhardness
Microscopy
Microstructure
Morphology
Nanoindentation
Nanotechnology
Original Research Article
Precipitates
Solidification
Solids
Structural Materials
Supercooling
Surfaces and Interfaces
Thin Films
Tin base alloys
Velocity
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Summary:In this study, container-less solidification of hyper-eutectic Ni–Sn alloy has been performed by using the electromagnetic levitation technique. The effect of undercooling on the formed microstructure and on the mechanical properties have been investigated. Growth velocities were determined by high-speed video-imaging of the solidification process. A step change in the growth velocities that are increasing with increasing undercooling is observed. This aligns with an observed first change in the microstructure between low and intermediate undercoolings. At the lower undercoolings, a pro-eutectic Ni 3 Sn phase along with lamellar eutectic structure in the inter-dendritic region is found. At intermediate undercooling of 100–150 K, a divorced eutectic microstructure is observed whereas at undercoolings above 165 K α -Ni precipitates are observed within β -Ni 3 Sn dendrites. Microhardness testing revealed higher strength for the lamellar phase as compared to the non-lamellar phase. Nano-indentation has been performed to determine the hardness and strength of individual phases in the microstructure.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-023-07172-z