Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment
In this work, the combination of cold rolling with post-aging treatment is developed to achieve the optimal strength−ductility for the in situ nano TiB<sub>2</sub>/Al−Cu−Mg composite. The microstructure and mechanical properties of the composite subjected to...
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doaj-a4f18a2ba7994626af2a16433006e3152020-11-25T02:36:22ZengMDPI AGMaterials1996-19442019-11-011221362610.3390/ma12213626ma12213626Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging TreatmentJunhui Tang0Jiwei Geng1Cunjuan Xia2Mingliang Wang3Dong Chen4Haowei Wang5School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, ChinaIn this work, the combination of cold rolling with post-aging treatment is developed to achieve the optimal strength−ductility for the in situ nano TiB<sub>2</sub>/Al−Cu−Mg composite. The microstructure and mechanical properties of the composite subjected to 20% thickness reduction of cold rolling at room temperature and their evolutions upon post-aging at different temperatures were investigated by means of a tensile test, differential scanning calorimetry, scanning electron microscopy, and transmission electron microscopy. It was found that the TiB<sub>2</sub> particles were effective in dislocation pinning and accumulation during the cold-rolling process. The tensile tests indicated that both the yield and ultimate tensile strengths of the cold-rolling sample increased a lot due to the dislocation strengthening and precipitation strengthening generated by dynamic precipitation during cold rolling in comparison with the conventional T6 sample. After aging at 100 °C/12 h, the elongation to failure reached ~8.4%, which was higher than the conventional T6 sample. Meanwhile, there was also a dramatic increase of strength. The yield and ultimate tensile strengths are ~644 MPa and ~726 MPa, respectively. This remarkable strength−ductility combination was due to the modified microstructure caused prior to artificial aging by the cold-rolling method and the formation of nanosized Guinier−Preston−Bagaryatsky (GPB) zones. The underlying mechanisms related to the superior strength−ductility combination were discussed regarding the microstructural characteristics in the composite.https://www.mdpi.com/1996-1944/12/21/3626al compositein situ tib<sub>2</sub> particlesmechanical propertiesaging behaviorgpb zones |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Junhui Tang Jiwei Geng Cunjuan Xia Mingliang Wang Dong Chen Haowei Wang |
| spellingShingle |
Junhui Tang Jiwei Geng Cunjuan Xia Mingliang Wang Dong Chen Haowei Wang Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment Materials al composite in situ tib<sub>2</sub> particles mechanical properties aging behavior gpb zones |
| author_facet |
Junhui Tang Jiwei Geng Cunjuan Xia Mingliang Wang Dong Chen Haowei Wang |
| author_sort |
Junhui Tang |
| title |
Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment |
| title_short |
Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment |
| title_full |
Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment |
| title_fullStr |
Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment |
| title_full_unstemmed |
Superior Strength and Ductility of In Situ Nano TiB<sub>2</sub>/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment |
| title_sort |
superior strength and ductility of in situ nano tib<sub>2</sub>/al–cu–mg composites by cold rolling and post-aging treatment |
| publisher |
MDPI AG |
| series |
Materials |
| issn |
1996-1944 |
| publishDate |
2019-11-01 |
| description |
In this work, the combination of cold rolling with post-aging treatment is developed to achieve the optimal strength−ductility for the in situ nano TiB<sub>2</sub>/Al−Cu−Mg composite. The microstructure and mechanical properties of the composite subjected to 20% thickness reduction of cold rolling at room temperature and their evolutions upon post-aging at different temperatures were investigated by means of a tensile test, differential scanning calorimetry, scanning electron microscopy, and transmission electron microscopy. It was found that the TiB<sub>2</sub> particles were effective in dislocation pinning and accumulation during the cold-rolling process. The tensile tests indicated that both the yield and ultimate tensile strengths of the cold-rolling sample increased a lot due to the dislocation strengthening and precipitation strengthening generated by dynamic precipitation during cold rolling in comparison with the conventional T6 sample. After aging at 100 °C/12 h, the elongation to failure reached ~8.4%, which was higher than the conventional T6 sample. Meanwhile, there was also a dramatic increase of strength. The yield and ultimate tensile strengths are ~644 MPa and ~726 MPa, respectively. This remarkable strength−ductility combination was due to the modified microstructure caused prior to artificial aging by the cold-rolling method and the formation of nanosized Guinier−Preston−Bagaryatsky (GPB) zones. The underlying mechanisms related to the superior strength−ductility combination were discussed regarding the microstructural characteristics in the composite. |
| topic |
al composite in situ tib<sub>2</sub> particles mechanical properties aging behavior gpb zones |
| url |
https://www.mdpi.com/1996-1944/12/21/3626 |
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