Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys
The Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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SPRINGER
2019
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/79368 |
| _version_ | 1848764039782465536 |
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| author | Zhou, D. Wang, H. Saxey, David Muránsky, O. Geng, H. Rickard, William Quadir, Z. Yang, C. Reddy, Steven Zhang, D. |
| author_facet | Zhou, D. Wang, H. Saxey, David Muránsky, O. Geng, H. Rickard, William Quadir, Z. Yang, C. Reddy, Steven Zhang, D. |
| author_sort | Zhou, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope would be very useful in designing new high-strength ultrafine grained (UFG) metallic materials. In this study, we investigated the microstructural factors affecting the Hall–Petch slope in UFG Al-Mg alloys with an average grain size range from 374 to 639 nm and different Mg contents of 0, 2.5, 5, and 7.5 at. pct. The rods prepared by extrusion of mechanically alloyed powder compacts were annealed for 5 hours at 380 °C, 420 °C, and 500 °C respectively followed by water quenching to produce the alloy samples in this study. The measured Hall–Petch slopes of the samples were found to increase with increasing Mg content and had higher values than those previously reported for Al(Mg) solid solutions with Mg concentrations comparable to the Mg contents in this study. Analysis of X-ray diffraction, transmission electron microscopy, and atom probe tomography experimental data as well as strengthening mechanisms demonstrates that the formation of nanoscale MgO dispersions plays a major role in the improved Hall–Petch slope observed in Al-Mg alloys. |
| first_indexed | 2025-11-14T11:13:01Z |
| format | Journal Article |
| id | curtin-20.500.11937-79368 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:13:01Z |
| publishDate | 2019 |
| publisher | SPRINGER |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-793682020-07-07T00:48:12Z Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys Zhou, D. Wang, H. Saxey, David Muránsky, O. Geng, H. Rickard, William Quadir, Z. Yang, C. Reddy, Steven Zhang, D. Science & Technology Technology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science STRENGTHENING MECHANISMS STRAIN-RATE PLASTIC-DEFORMATION THERMAL-STABILITY ALUMINUM SIZE DISPERSION EXTRUSION YIELD MICROSTRUCTURE The Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope would be very useful in designing new high-strength ultrafine grained (UFG) metallic materials. In this study, we investigated the microstructural factors affecting the Hall–Petch slope in UFG Al-Mg alloys with an average grain size range from 374 to 639 nm and different Mg contents of 0, 2.5, 5, and 7.5 at. pct. The rods prepared by extrusion of mechanically alloyed powder compacts were annealed for 5 hours at 380 °C, 420 °C, and 500 °C respectively followed by water quenching to produce the alloy samples in this study. The measured Hall–Petch slopes of the samples were found to increase with increasing Mg content and had higher values than those previously reported for Al(Mg) solid solutions with Mg concentrations comparable to the Mg contents in this study. Analysis of X-ray diffraction, transmission electron microscopy, and atom probe tomography experimental data as well as strengthening mechanisms demonstrates that the formation of nanoscale MgO dispersions plays a major role in the improved Hall–Petch slope observed in Al-Mg alloys. 2019 Journal Article http://hdl.handle.net/20.500.11937/79368 10.1007/s11661-019-05329-3 English SPRINGER restricted |
| spellingShingle | Science & Technology Technology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science STRENGTHENING MECHANISMS STRAIN-RATE PLASTIC-DEFORMATION THERMAL-STABILITY ALUMINUM SIZE DISPERSION EXTRUSION YIELD MICROSTRUCTURE Zhou, D. Wang, H. Saxey, David Muránsky, O. Geng, H. Rickard, William Quadir, Z. Yang, C. Reddy, Steven Zhang, D. Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title | Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title_full | Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title_fullStr | Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title_full_unstemmed | Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title_short | Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys |
| title_sort | hall–petch slope in ultrafine grained al-mg alloys |
| topic | Science & Technology Technology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science STRENGTHENING MECHANISMS STRAIN-RATE PLASTIC-DEFORMATION THERMAL-STABILITY ALUMINUM SIZE DISPERSION EXTRUSION YIELD MICROSTRUCTURE |
| url | http://hdl.handle.net/20.500.11937/79368 |