Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy
In the Al casting industry, TiB2 grain refiner particles are added to the melt in order to promote heterogeneous nucleation of α-Al crystallites. It has been suggested that thin Al3Ti DO22 layers, adsorbed on the boride particles, might be necessary for successful α-Al nucleation via the peritectic...
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| Format: | Conference item |
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2004
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| author | Cizek, P McKay, B Lozano-Perez, S |
| author_facet | Cizek, P McKay, B Lozano-Perez, S |
| author_sort | Cizek, P |
| collection | OXFORD |
| description | In the Al casting industry, TiB2 grain refiner particles are added to the melt in order to promote heterogeneous nucleation of α-Al crystallites. It has been suggested that thin Al3Ti DO22 layers, adsorbed on the boride particles, might be necessary for successful α-Al nucleation via the peritectic reaction. In order to elucidate this suggestion, the boride/α-Al interfaces were studied in the as-received Ti-B-Al grain refiner rod, as well as after remelting and rapid quenching of the same rod. The investigation was performed using the TEM, EDS, STEM and HREM techniques. For the as- received rod, the EDS study failed to show conclusively enrichment of the interfaces in Ti and indicated clearly only a small enrichment in Si and Fe. The HREM investigation found no indication of a possible crystalline layer coating the boride particles. The borides found in the re-melted rod were observed to readily nucleate α-Al on their basal faces with a well-defined low-index orientation relationship but there was again no indication of any layer on the boride particles. Thus, the borides themselves appeared to be potent sites for the heterogeneous nucleation of α-Al crystals during rapid quenching without a necessary presence of the aluminide layers. |
| first_indexed | 2024-03-07T04:22:02Z |
| format | Conference item |
| id | oxford-uuid:cb572e5a-350b-4967-8d09-d4261e4171ba |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:22:02Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:cb572e5a-350b-4967-8d09-d4261e4171ba2022-03-27T07:14:07ZInvestigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloyConference itemhttp://purl.org/coar/resource_type/c_5794uuid:cb572e5a-350b-4967-8d09-d4261e4171baSymplectic Elements at Oxford2004Cizek, PMcKay, BLozano-Perez, SIn the Al casting industry, TiB2 grain refiner particles are added to the melt in order to promote heterogeneous nucleation of α-Al crystallites. It has been suggested that thin Al3Ti DO22 layers, adsorbed on the boride particles, might be necessary for successful α-Al nucleation via the peritectic reaction. In order to elucidate this suggestion, the boride/α-Al interfaces were studied in the as-received Ti-B-Al grain refiner rod, as well as after remelting and rapid quenching of the same rod. The investigation was performed using the TEM, EDS, STEM and HREM techniques. For the as- received rod, the EDS study failed to show conclusively enrichment of the interfaces in Ti and indicated clearly only a small enrichment in Si and Fe. The HREM investigation found no indication of a possible crystalline layer coating the boride particles. The borides found in the re-melted rod were observed to readily nucleate α-Al on their basal faces with a well-defined low-index orientation relationship but there was again no indication of any layer on the boride particles. Thus, the borides themselves appeared to be potent sites for the heterogeneous nucleation of α-Al crystals during rapid quenching without a necessary presence of the aluminide layers. |
| spellingShingle | Cizek, P McKay, B Lozano-Perez, S Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title | Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title_full | Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title_fullStr | Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title_full_unstemmed | Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title_short | Investigation of the interfaces between boride particles and aluminium in the As-received and Re-melted Ti-B-Al grain refiner master alloy |
| title_sort | investigation of the interfaces between boride particles and aluminium in the as received and re melted ti b al grain refiner master alloy |
| work_keys_str_mv | AT cizekp investigationoftheinterfacesbetweenborideparticlesandaluminiumintheasreceivedandremeltedtibalgrainrefinermasteralloy AT mckayb investigationoftheinterfacesbetweenborideparticlesandaluminiumintheasreceivedandremeltedtibalgrainrefinermasteralloy AT lozanoperezs investigationoftheinterfacesbetweenborideparticlesandaluminiumintheasreceivedandremeltedtibalgrainrefinermasteralloy |