Element segregation and α2 formation in primary α of a near-α Ti-alloy
Alloy TIMETAL®834 is a near-α Ti-alloy typically processed to have a complex bimodal microstructure that provides a good combination of mechanical properties at temperatures in excess of 450 °C. Due to the high Al content, typical ageing procedures result in the formation of intragranular and cohere...
| Κύριοι συγγραφείς: | , , , , , , , , , |
|---|---|
| Μορφή: | Journal article |
| Γλώσσα: | English |
| Έκδοση: |
Elsevier
2020
|
| _version_ | 1826269228195381248 |
|---|---|
| author | Dichtl, C Zhang, Z Gardner, H Bagot, P Radecka, A Dye, D Thomas, M Sandala, R da Fonseca, JQ Preuss, M |
| author_facet | Dichtl, C Zhang, Z Gardner, H Bagot, P Radecka, A Dye, D Thomas, M Sandala, R da Fonseca, JQ Preuss, M |
| author_sort | Dichtl, C |
| collection | OXFORD |
| description | Alloy TIMETAL®834 is a near-α Ti-alloy typically processed to have a complex bimodal microstructure that provides a good combination of mechanical properties at temperatures in excess of 450 °C. Due to the high Al content, typical ageing procedures result in the formation of intragranular and coherent nano-scale Ti3Al precipitation (α2), which increase strength but also promotes slip planarity. The present study focuses on chemical partitioning as a result of sub-β-transus heat treatment and the consequences for the two different constituents in the bimodal microstructure. The detailed chemical and structural analysis were carried out by combining Electron Probe Micro Analysis (EPMA), Wavelength Dispersive Spectroscopy (WDS), Transmission Electron Microscopy (TEM) and Atom Probe Tomography (APT) for investigating local compositional variations and their effect on the formation of α2 precipitates. Detailed microchemical analysis shows a core-shell composition arrangement of α-stabilisers with the shell composition similar to the one of secondary α. Selected area electron diffraction in the TEM and APT analysis demonstrates that those local variations in α stabilisers affect the level of α2 precipitation. In addition, EPMA maps show that while Zr and Sn are often considered to be neutral alloying elements in Ti-alloys, they do segregate to the β-phase during sub-β-transus heat treatment. |
| first_indexed | 2024-03-06T21:21:46Z |
| format | Journal article |
| id | oxford-uuid:41adfa37-c3ad-497c-961f-9e6f76523960 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:21:46Z |
| publishDate | 2020 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:41adfa37-c3ad-497c-961f-9e6f765239602022-03-26T14:45:13ZElement segregation and α2 formation in primary α of a near-α Ti-alloyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:41adfa37-c3ad-497c-961f-9e6f76523960EnglishSymplectic ElementsElsevier 2020Dichtl, CZhang, ZGardner, HBagot, PRadecka, ADye, DThomas, MSandala, Rda Fonseca, JQPreuss, MAlloy TIMETAL®834 is a near-α Ti-alloy typically processed to have a complex bimodal microstructure that provides a good combination of mechanical properties at temperatures in excess of 450 °C. Due to the high Al content, typical ageing procedures result in the formation of intragranular and coherent nano-scale Ti3Al precipitation (α2), which increase strength but also promotes slip planarity. The present study focuses on chemical partitioning as a result of sub-β-transus heat treatment and the consequences for the two different constituents in the bimodal microstructure. The detailed chemical and structural analysis were carried out by combining Electron Probe Micro Analysis (EPMA), Wavelength Dispersive Spectroscopy (WDS), Transmission Electron Microscopy (TEM) and Atom Probe Tomography (APT) for investigating local compositional variations and their effect on the formation of α2 precipitates. Detailed microchemical analysis shows a core-shell composition arrangement of α-stabilisers with the shell composition similar to the one of secondary α. Selected area electron diffraction in the TEM and APT analysis demonstrates that those local variations in α stabilisers affect the level of α2 precipitation. In addition, EPMA maps show that while Zr and Sn are often considered to be neutral alloying elements in Ti-alloys, they do segregate to the β-phase during sub-β-transus heat treatment. |
| spellingShingle | Dichtl, C Zhang, Z Gardner, H Bagot, P Radecka, A Dye, D Thomas, M Sandala, R da Fonseca, JQ Preuss, M Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title | Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title_full | Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title_fullStr | Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title_full_unstemmed | Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title_short | Element segregation and α2 formation in primary α of a near-α Ti-alloy |
| title_sort | element segregation and α2 formation in primary α of a near α ti alloy |
| work_keys_str_mv | AT dichtlc elementsegregationanda2formationinprimaryaofanearatialloy AT zhangz elementsegregationanda2formationinprimaryaofanearatialloy AT gardnerh elementsegregationanda2formationinprimaryaofanearatialloy AT bagotp elementsegregationanda2formationinprimaryaofanearatialloy AT radeckaa elementsegregationanda2formationinprimaryaofanearatialloy AT dyed elementsegregationanda2formationinprimaryaofanearatialloy AT thomasm elementsegregationanda2formationinprimaryaofanearatialloy AT sandalar elementsegregationanda2formationinprimaryaofanearatialloy AT dafonsecajq elementsegregationanda2formationinprimaryaofanearatialloy AT preussm elementsegregationanda2formationinprimaryaofanearatialloy |