Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion
A uniform distribution of TiCp nanoparticles was realized in the TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite fabricated by the method of ultrasonic-assisted semisolid stirring. Microstructure and mechanical properties of the nanocomposite before and after extrusion were investigated. The results show th...
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| Format: | Article |
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Journal of Aeronautical Materials
2020-10-01
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| Series: | Journal of Aeronautical Materials |
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| Online Access: | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2020.000083 |
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| author | NIE Kaibo ZHU Zhihao DENG Kunkun HAN Jungang |
| author_facet | NIE Kaibo ZHU Zhihao DENG Kunkun HAN Jungang |
| author_sort | NIE Kaibo |
| collection | DOAJ |
| description | A uniform distribution of TiCp nanoparticles was realized in the TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite fabricated by the method of ultrasonic-assisted semisolid stirring. Microstructure and mechanical properties of the nanocomposite before and after extrusion were investigated. The results show that the grains in the dense area of the second phase were smaller than those in the barren area, and the second phase was Ca2Mg6Zn3. Dynamic recrystallization (DRX) occurred in the nanocomposites after extrusion at different temperatures (350 °C, 310 °C and 270 °C). Both the sizes and volume fraction of DRX grains and precipitates size were obviously refined as the extrusion temperature decreased, while the volume fraction of precipitates increased. Ultrafine recrystallized grain structure (≈0.34 μm) with a substantial of fine precipitates appeared in the nanocomposite extruded at 270 °C. The refined grain structure was not only due to DRX, but also the synergistic pinning effect of nano-TiCp, precipitated MgZn2 and α-Mn particles. The optimum tensile strength was achieved in the nanocomposites extruded at 270 °C/0.1 mm•s–1, and the yield strength (YS), ultimate tensile strength (UTS) and elongation to failure (EL)were ≈439.7 MPa、≈460.2 MPa and ≈1.73%, respectively. The grain refinement strengthening with the contribution ratio over 60% to YS increment was much higher relative to thermal expansion effect, Orowan strengthening and dislocation strengthening. |
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| spelling | doaj.art-531f668cc75045cba40e25b3995094a42022-12-21T21:30:33ZzhoJournal of Aeronautical MaterialsJournal of Aeronautical Materials1005-50531005-50532020-10-01405202810.11868/j.issn.1005-5053.2020.000083a2020-0083Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusionNIE Kaibo0ZHU Zhihao1DENG Kunkun2HAN Jungang3College of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024，ChinaCollege of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024，ChinaCollege of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024，ChinaCollege of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024，ChinaA uniform distribution of TiCp nanoparticles was realized in the TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite fabricated by the method of ultrasonic-assisted semisolid stirring. Microstructure and mechanical properties of the nanocomposite before and after extrusion were investigated. The results show that the grains in the dense area of the second phase were smaller than those in the barren area, and the second phase was Ca2Mg6Zn3. Dynamic recrystallization (DRX) occurred in the nanocomposites after extrusion at different temperatures (350 °C, 310 °C and 270 °C). Both the sizes and volume fraction of DRX grains and precipitates size were obviously refined as the extrusion temperature decreased, while the volume fraction of precipitates increased. Ultrafine recrystallized grain structure (≈0.34 μm) with a substantial of fine precipitates appeared in the nanocomposite extruded at 270 °C. The refined grain structure was not only due to DRX, but also the synergistic pinning effect of nano-TiCp, precipitated MgZn2 and α-Mn particles. The optimum tensile strength was achieved in the nanocomposites extruded at 270 °C/0.1 mm•s–1, and the yield strength (YS), ultimate tensile strength (UTS) and elongation to failure (EL)were ≈439.7 MPa、≈460.2 MPa and ≈1.73%, respectively. The grain refinement strengthening with the contribution ratio over 60% to YS increment was much higher relative to thermal expansion effect, Orowan strengthening and dislocation strengthening.http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2020.000083magnesium matrix nanocompositeextrusionmicrostructuremechanical propertiesstrengthening mechanism |
| spellingShingle | NIE Kaibo ZHU Zhihao DENG Kunkun HAN Jungang Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion Journal of Aeronautical Materials magnesium matrix nanocomposite extrusion microstructure mechanical properties strengthening mechanism |
| title | Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion |
| title_full | Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion |
| title_fullStr | Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion |
| title_full_unstemmed | Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion |
| title_short | Microstructure and mechanical properties of ultra-high strength TiCp/Mg-1.4Zn-2.6Ca-0.5Mn nanocomposite after hot extrusion |
| title_sort | microstructure and mechanical properties of ultra high strength ticp mg 1 4zn 2 6ca 0 5mn nanocomposite after hot extrusion |
| topic | magnesium matrix nanocomposite extrusion microstructure mechanical properties strengthening mechanism |
| url | http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2020.000083 |
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