About this Abstract |
Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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Symposium
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2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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Presentation Title |
Compositional Variation Effect on the Microstructure and Nanomechanical Properties of Additively Manufactured AlCuFeNiTi High Entropy Alloy |
Author(s) |
Sandeep Khadka, Hubert K. Bilan, Tao Ma, Philip A. Yuya |
On-Site Speaker (Planned) |
Sandeep Khadka |
Abstract Scope |
An equiatomic AlCuFeNiTi high entropy alloy (HEA) was successfully fabricated for the first time using pre-alloyed powder with directed energy deposition method. The alloy was characterized using microscopy techniques and nanoindentation to provide insight into the relationship between its microstructural and nanoscale mechanical properties. The microstructure has a dominant dendritic region with an ordered Heusler structure (L21) and an interdendritic region with FCC structure with traces of C14 Laves region. During solidification, dendritic fragmentation occurs, contributing to the alloy having mostly equiaxed grains rather than the commonly observed columnar grains. Nanoindentation results showed that the interdendritic regions present soft zone while Laves phase presents the hardest region. The presence of laves phase inside the grain boundaries strengthens the region. The results of the current study highlight the synthesis of an equiaxed HEA with one of the highest combinations of elastic modulus and hardness values determined using nanoindentation. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |