Pt accelerated coarsening of A15 precipitates in Cr-Si alloys
The effect of alloying Cr-rich Cr-Si alloys with Pt was investigated by a combination of complementary experimental methods and atomic scale modelling. The investigated Cr-Si and Cr-Si-Pt (Cr ⩾86 at.%) alloys developed a two-phase microstructure consisting of Cr solid solution (Crss) matrix and stre...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-06-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522002763 |
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| author | Anke S. Ulrich Alexander J. Knowles Valentina Cantatore Ayan Bhowmik Michael T. Wharmby Christine Geers Itai Panas Mathias C. Galetz |
| author_facet | Anke S. Ulrich Alexander J. Knowles Valentina Cantatore Ayan Bhowmik Michael T. Wharmby Christine Geers Itai Panas Mathias C. Galetz |
| author_sort | Anke S. Ulrich |
| collection | DOAJ |
| description | The effect of alloying Cr-rich Cr-Si alloys with Pt was investigated by a combination of complementary experimental methods and atomic scale modelling. The investigated Cr-Si and Cr-Si-Pt (Cr ⩾86 at.%) alloys developed a two-phase microstructure consisting of Cr solid solution (Crss) matrix and strengthened by A15 precipitates during annealing at 1200°C. It was found that additions of 2 at.% Pt increase the coarsening rate by almost five times considering annealing times up to 522 h. Pt was found to change the precipitate matrix orientation relationship, despite its low influence on the Crss matrix/A15 precipitate misfit. Through this experimental and modelling approach new insight has been gained into mechanisms of enhanced coarsening by Pt addition. The increased coarsening is principally attributed to a change in interface composition and structure resulting in different thermodynamic stabilities: Pt-containing A15 phase was found to have a broader compositional range if both elements, Pt and Si, are present compared to only Si. Additionally, the Crss phase was found to have a higher solubility of Pt and Si over just Si. Both factors additionally facilitated Ostwald ripening. |
| first_indexed | 2024-04-12T17:07:08Z |
| format | Article |
| id | doaj.art-3895bfa800d24e99b9f99a826d6d55ea |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-12T17:07:08Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-3895bfa800d24e99b9f99a826d6d55ea2022-12-22T03:23:55ZengElsevierMaterials & Design0264-12752022-06-01218110655Pt accelerated coarsening of A15 precipitates in Cr-Si alloysAnke S. Ulrich0Alexander J. Knowles1Valentina Cantatore2Ayan Bhowmik3Michael T. Wharmby4Christine Geers5Itai Panas6Mathias C. Galetz7High Temperature Materials, DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany; Corresponding author.School of Metallurgy & Materials, University of Birmingham, Birmingham B15 2TT, UK; Faculty of Engineering, Department of Materials, Imperial College London, Royal School of Mines, Exhibition Road, London SW7 2AZ, UKEnvironmental Inorganic Chemistry, Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Gothenburg, SwedenDepartment of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, IndiaDESY Photon Science, Notkestr. 85, 22607 Hamburg, GermanyEnvironmental Inorganic Chemistry, Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Gothenburg, SwedenEnvironmental Inorganic Chemistry, Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Gothenburg, SwedenHigh Temperature Materials, DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, GermanyThe effect of alloying Cr-rich Cr-Si alloys with Pt was investigated by a combination of complementary experimental methods and atomic scale modelling. The investigated Cr-Si and Cr-Si-Pt (Cr ⩾86 at.%) alloys developed a two-phase microstructure consisting of Cr solid solution (Crss) matrix and strengthened by A15 precipitates during annealing at 1200°C. It was found that additions of 2 at.% Pt increase the coarsening rate by almost five times considering annealing times up to 522 h. Pt was found to change the precipitate matrix orientation relationship, despite its low influence on the Crss matrix/A15 precipitate misfit. Through this experimental and modelling approach new insight has been gained into mechanisms of enhanced coarsening by Pt addition. The increased coarsening is principally attributed to a change in interface composition and structure resulting in different thermodynamic stabilities: Pt-containing A15 phase was found to have a broader compositional range if both elements, Pt and Si, are present compared to only Si. Additionally, the Crss phase was found to have a higher solubility of Pt and Si over just Si. Both factors additionally facilitated Ostwald ripening.http://www.sciencedirect.com/science/article/pii/S0264127522002763High temperature materialsTransition-metal silicidesCoarsening mechanismOrientation relationshipDensity functional theory |
| spellingShingle | Anke S. Ulrich Alexander J. Knowles Valentina Cantatore Ayan Bhowmik Michael T. Wharmby Christine Geers Itai Panas Mathias C. Galetz Pt accelerated coarsening of A15 precipitates in Cr-Si alloys Materials & Design High temperature materials Transition-metal silicides Coarsening mechanism Orientation relationship Density functional theory |
| title | Pt accelerated coarsening of A15 precipitates in Cr-Si alloys |
| title_full | Pt accelerated coarsening of A15 precipitates in Cr-Si alloys |
| title_fullStr | Pt accelerated coarsening of A15 precipitates in Cr-Si alloys |
| title_full_unstemmed | Pt accelerated coarsening of A15 precipitates in Cr-Si alloys |
| title_short | Pt accelerated coarsening of A15 precipitates in Cr-Si alloys |
| title_sort | pt accelerated coarsening of a15 precipitates in cr si alloys |
| topic | High temperature materials Transition-metal silicides Coarsening mechanism Orientation relationship Density functional theory |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522002763 |
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