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| author_facet |
Cabibbo, Marcello Cabibbo, Marcello |
|---|---|
| author |
Cabibbo, Marcello |
| spellingShingle |
Cabibbo, Marcello Metals Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach General Materials Science Metals and Alloys |
| author_sort |
cabibbo, marcello |
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Cabibbo, Marcello 2075-4701 MDPI AG General Materials Science Metals and Alloys http://dx.doi.org/10.3390/met8110962 <jats:p>Nanostructured metallic materials can be obtained by two major processing strategies: a bottom-up approach that starts with powdered metals to be mechanically and chemically compacted via different compaction methodologies, and a top-down approach that starts with bulk conventional metallic materials that are induced to a sometimes-extraordinary grain size reduction via different severe plastic deformation (SPD) methods. In the present study, a dual strategy was followed to obtain a sound and stable nanostructured commercially pure cobalt. Powdered cobalt of 2 μm was compacted by ball-milling (BM) followed by spark-plasma sintering (SPS) to obtain a bulk metallic material whose relative mass density reached a value of 95.8%. This process constituted a bottom-up strategy to obtain ultrafine submicrometer-grained bulk cobalt, and a top-down strategy of subjecting the BM + SPS submicrometer-grained cobalt to a specific SPD technique, namely equal-channel angular pressing (ECAP). The latter was carried out in one to four passes following so-called route BC, reaching 98.4% density and a nanometric-grained microstructure. The material was microstructurally and mechanically characterized by TEM (transmission electron microscope) and nanoindentation. The obtained results are a representative solid example for obtaining nanostructured metallic materials using both grain-refining strategies, bottom-up and top-down.</jats:p> Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach Metals |
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10.3390/met8110962 |
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Chemie und Pharmazie |
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MDPI AG, 2018 |
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MDPI AG, 2018 |
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2075-4701 |
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2018 |
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MDPI AG |
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Metals |
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49 |
| title |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_unstemmed |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_full |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_fullStr |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_full_unstemmed |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_short |
Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_sort |
nanostructured cobalt obtained by combining bottom-up and top-down approach |
| topic |
General Materials Science Metals and Alloys |
| url |
http://dx.doi.org/10.3390/met8110962 |
| publishDate |
2018 |
| physical |
962 |
| description |
<jats:p>Nanostructured metallic materials can be obtained by two major processing strategies: a bottom-up approach that starts with powdered metals to be mechanically and chemically compacted via different compaction methodologies, and a top-down approach that starts with bulk conventional metallic materials that are induced to a sometimes-extraordinary grain size reduction via different severe plastic deformation (SPD) methods. In the present study, a dual strategy was followed to obtain a sound and stable nanostructured commercially pure cobalt. Powdered cobalt of 2 μm was compacted by ball-milling (BM) followed by spark-plasma sintering (SPS) to obtain a bulk metallic material whose relative mass density reached a value of 95.8%. This process constituted a bottom-up strategy to obtain ultrafine submicrometer-grained bulk cobalt, and a top-down strategy of subjecting the BM + SPS submicrometer-grained cobalt to a specific SPD technique, namely equal-channel angular pressing (ECAP). The latter was carried out in one to four passes following so-called route BC, reaching 98.4% density and a nanometric-grained microstructure. The material was microstructurally and mechanically characterized by TEM (transmission electron microscope) and nanoindentation. The obtained results are a representative solid example for obtaining nanostructured metallic materials using both grain-refining strategies, bottom-up and top-down.</jats:p> |
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| author | Cabibbo, Marcello |
| author_facet | Cabibbo, Marcello, Cabibbo, Marcello |
| author_sort | cabibbo, marcello |
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| description | <jats:p>Nanostructured metallic materials can be obtained by two major processing strategies: a bottom-up approach that starts with powdered metals to be mechanically and chemically compacted via different compaction methodologies, and a top-down approach that starts with bulk conventional metallic materials that are induced to a sometimes-extraordinary grain size reduction via different severe plastic deformation (SPD) methods. In the present study, a dual strategy was followed to obtain a sound and stable nanostructured commercially pure cobalt. Powdered cobalt of 2 μm was compacted by ball-milling (BM) followed by spark-plasma sintering (SPS) to obtain a bulk metallic material whose relative mass density reached a value of 95.8%. This process constituted a bottom-up strategy to obtain ultrafine submicrometer-grained bulk cobalt, and a top-down strategy of subjecting the BM + SPS submicrometer-grained cobalt to a specific SPD technique, namely equal-channel angular pressing (ECAP). The latter was carried out in one to four passes following so-called route BC, reaching 98.4% density and a nanometric-grained microstructure. The material was microstructurally and mechanically characterized by TEM (transmission electron microscope) and nanoindentation. The obtained results are a representative solid example for obtaining nanostructured metallic materials using both grain-refining strategies, bottom-up and top-down.</jats:p> |
| doi_str_mv | 10.3390/met8110962 |
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| imprint | MDPI AG, 2018 |
| imprint_str_mv | MDPI AG, 2018 |
| institution | DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15 |
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| language | English |
| last_indexed | 2024-03-01T13:41:37.538Z |
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| physical | 962 |
| publishDate | 2018 |
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| series | Metals |
| source_id | 49 |
| spelling | Cabibbo, Marcello 2075-4701 MDPI AG General Materials Science Metals and Alloys http://dx.doi.org/10.3390/met8110962 <jats:p>Nanostructured metallic materials can be obtained by two major processing strategies: a bottom-up approach that starts with powdered metals to be mechanically and chemically compacted via different compaction methodologies, and a top-down approach that starts with bulk conventional metallic materials that are induced to a sometimes-extraordinary grain size reduction via different severe plastic deformation (SPD) methods. In the present study, a dual strategy was followed to obtain a sound and stable nanostructured commercially pure cobalt. Powdered cobalt of 2 μm was compacted by ball-milling (BM) followed by spark-plasma sintering (SPS) to obtain a bulk metallic material whose relative mass density reached a value of 95.8%. This process constituted a bottom-up strategy to obtain ultrafine submicrometer-grained bulk cobalt, and a top-down strategy of subjecting the BM + SPS submicrometer-grained cobalt to a specific SPD technique, namely equal-channel angular pressing (ECAP). The latter was carried out in one to four passes following so-called route BC, reaching 98.4% density and a nanometric-grained microstructure. The material was microstructurally and mechanically characterized by TEM (transmission electron microscope) and nanoindentation. The obtained results are a representative solid example for obtaining nanostructured metallic materials using both grain-refining strategies, bottom-up and top-down.</jats:p> Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach Metals |
| spellingShingle | Cabibbo, Marcello, Metals, Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach, General Materials Science, Metals and Alloys |
| title | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_full | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_fullStr | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_full_unstemmed | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_short | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| title_sort | nanostructured cobalt obtained by combining bottom-up and top-down approach |
| title_unstemmed | Nanostructured Cobalt Obtained by Combining Bottom-Up and Top-Down Approach |
| topic | General Materials Science, Metals and Alloys |
| url | http://dx.doi.org/10.3390/met8110962 |