Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification
Abstract For hypereutectic Nb-Si based alloys, primary Nb5Si3 phases typically grow in a faceted mode during equilibrium or near-equilibrium solidification, which damages the ductility and toughness. To address this issue, here we artificially manipulate the growth morphology of Nb5Si3 using electro...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-06-01
|
| Series: | Chinese Journal of Mechanical Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s10033-022-00764-7 |
| _version_ | 1818242570338172928 |
|---|---|
| author | Yueling Guo Lina Jia Wenjun Lu Hu Zhang |
| author_facet | Yueling Guo Lina Jia Wenjun Lu Hu Zhang |
| author_sort | Yueling Guo |
| collection | DOAJ |
| description | Abstract For hypereutectic Nb-Si based alloys, primary Nb5Si3 phases typically grow in a faceted mode during equilibrium or near-equilibrium solidification, which damages the ductility and toughness. To address this issue, here we artificially manipulate the growth morphology of Nb5Si3 using electron beam surface melting (EBSM) and subsequent annealing treatments. Results show that such a non-equilibrium solidification pathway enables the transition from faceted growth to non-faceted dendritic growth of Nb5Si3, along with evident microstructure refinement, generation of metastable β-Nb5Si3 phases and elimination of chemical segregation. The transformation from β-Nb5Si3 to α-Nb5Si3 and Nb solid solution (Nbss) particles is triggered by the annealing treatment at 1450 °C for 5 h. Also, we find the annealing-mediated formation of inherited Nb5Si3 dendrites that maintain the dendritic morphology of the original as-solidified β-Nb5Si3 dendrites. This work thus provides a feasible routine to obtain thermally stable and refined α-Nb5Si3 dendrites in hypereutectic Nb-Si based alloys. |
| first_indexed | 2024-12-12T13:47:20Z |
| format | Article |
| id | doaj.art-3ed9aaca3d3c43e2888a3b3cbebd1c61 |
| institution | Directory Open Access Journal |
| issn | 1000-9345 2192-8258 |
| language | English |
| last_indexed | 2024-12-12T13:47:20Z |
| publishDate | 2022-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Chinese Journal of Mechanical Engineering |
| spelling | doaj.art-3ed9aaca3d3c43e2888a3b3cbebd1c612022-12-22T00:22:39ZengSpringerOpenChinese Journal of Mechanical Engineering1000-93452192-82582022-06-013511810.1186/s10033-022-00764-7Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium SolidificationYueling Guo0Lina Jia1Wenjun Lu2Hu Zhang3School of Mechanical Engineering, Beijing Institute of TechnologyResearch Center of Light-alloy Materials, Frontier Institute of Science and Technology Innovation, Beihang UniversityMax-Planck-Institut für EisenforschungResearch Center of Light-alloy Materials, Frontier Institute of Science and Technology Innovation, Beihang UniversityAbstract For hypereutectic Nb-Si based alloys, primary Nb5Si3 phases typically grow in a faceted mode during equilibrium or near-equilibrium solidification, which damages the ductility and toughness. To address this issue, here we artificially manipulate the growth morphology of Nb5Si3 using electron beam surface melting (EBSM) and subsequent annealing treatments. Results show that such a non-equilibrium solidification pathway enables the transition from faceted growth to non-faceted dendritic growth of Nb5Si3, along with evident microstructure refinement, generation of metastable β-Nb5Si3 phases and elimination of chemical segregation. The transformation from β-Nb5Si3 to α-Nb5Si3 and Nb solid solution (Nbss) particles is triggered by the annealing treatment at 1450 °C for 5 h. Also, we find the annealing-mediated formation of inherited Nb5Si3 dendrites that maintain the dendritic morphology of the original as-solidified β-Nb5Si3 dendrites. This work thus provides a feasible routine to obtain thermally stable and refined α-Nb5Si3 dendrites in hypereutectic Nb-Si based alloys.https://doi.org/10.1186/s10033-022-00764-7Nb-Si alloyIntermetallicsNb5Si3Rapid solidificationDendritic growth |
| spellingShingle | Yueling Guo Lina Jia Wenjun Lu Hu Zhang Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification Chinese Journal of Mechanical Engineering Nb-Si alloy Intermetallics Nb5Si3 Rapid solidification Dendritic growth |
| title | Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification |
| title_full | Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification |
| title_fullStr | Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification |
| title_full_unstemmed | Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification |
| title_short | Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification |
| title_sort | morphological heredity of intermetallic nb5si3 dendrites in hypereutectic nb si based alloys via non equilibrium solidification |
| topic | Nb-Si alloy Intermetallics Nb5Si3 Rapid solidification Dendritic growth |
| url | https://doi.org/10.1186/s10033-022-00764-7 |
| work_keys_str_mv | AT yuelingguo morphologicalheredityofintermetallicnb5si3dendritesinhypereutecticnbsibasedalloysvianonequilibriumsolidification AT linajia morphologicalheredityofintermetallicnb5si3dendritesinhypereutecticnbsibasedalloysvianonequilibriumsolidification AT wenjunlu morphologicalheredityofintermetallicnb5si3dendritesinhypereutecticnbsibasedalloysvianonequilibriumsolidification AT huzhang morphologicalheredityofintermetallicnb5si3dendritesinhypereutecticnbsibasedalloysvianonequilibriumsolidification |