The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content
The thermo-stability of microstructure during isothermal annealing at 900 °C and 1000 °C in a cold-worked Cu-Al2O3 composite with 0.1 wt.% Al content and its effect on resistance to softening were investigated in this paper. The results reveal that the microstructure following cold deformation consi...
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Kaunas University of Technology
2024-11-01
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| Series: | Medžiagotyra |
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| Online Access: | https://matsc.ktu.lt/index.php/MatSc/article/view/36919 |
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| author | Dongping ZHANG Peng WEI Hengju LI Zhihui CHEN Kuixian WEI |
| author_facet | Dongping ZHANG Peng WEI Hengju LI Zhihui CHEN Kuixian WEI |
| author_sort | Dongping ZHANG |
| collection | DOAJ |
| description | The thermo-stability of microstructure during isothermal annealing at 900 °C and 1000 °C in a cold-worked Cu-Al2O3 composite with 0.1 wt.% Al content and its effect on resistance to softening were investigated in this paper. The results reveal that the microstructure following cold deformation consists of a Cu matrix with a refined grain size and high-density dislocations, accompanied by dispersed Al2O3 nanoparticles exhibiting an extremely low volume fraction. During isothermal annealing at 900 °C, the Al2O3 nanoparticles can strongly restrict the migration of the dislocations and suppress the recrystallization of the fine-grained Cu matrix by the Zener pinning effect. Furthermore, the presence of pinned dislocations facilitates the formation of sub-grain boundaries comprising high-density dislocations. Consequently, the Cu-Al2O3 composite with 0.1 wt.% Al content exhibits remarkable thermo-stability in its microstructure due to the incorporation of Al2O3 nanoparticles, resulting in a significantly elevated softening temperature of up to 1000 °C and thereby demonstrating excellent resistance against softening. However, the observed phenomenon of softening after isothermal annealing at 1000 °C for 5 hours can be attributed to extensive recrystallization growth that promotes twin boundary formation, primarily caused by the weakening Zener pinning effect resulting from Oswald ripening of Al2O3 and rod-like Al2O3 formation. |
| format | Article |
| id | doaj-art-dd8b6374866d4a3ab623d274f68d0498 |
| institution | Kabale University |
| issn | 1392-1320 2029-7289 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Kaunas University of Technology |
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| series | Medžiagotyra |
| spelling | doaj-art-dd8b6374866d4a3ab623d274f68d04982024-11-28T08:28:19ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892024-11-0130445245810.5755/j02.ms.3691942173The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al ContentDongping ZHANG0Peng WEI1Hengju LI2Zhihui CHEN3Kuixian WEI4Kunming University of Science and Technology / Huanggang Polytechnic CollegeHuanggang Polytechnic CollegeHuanggang Polytechnic CollegeShanghai Tianma Micro-Electronics Co.,Ltd. Kunming University of Science and TechnologyThe thermo-stability of microstructure during isothermal annealing at 900 °C and 1000 °C in a cold-worked Cu-Al2O3 composite with 0.1 wt.% Al content and its effect on resistance to softening were investigated in this paper. The results reveal that the microstructure following cold deformation consists of a Cu matrix with a refined grain size and high-density dislocations, accompanied by dispersed Al2O3 nanoparticles exhibiting an extremely low volume fraction. During isothermal annealing at 900 °C, the Al2O3 nanoparticles can strongly restrict the migration of the dislocations and suppress the recrystallization of the fine-grained Cu matrix by the Zener pinning effect. Furthermore, the presence of pinned dislocations facilitates the formation of sub-grain boundaries comprising high-density dislocations. Consequently, the Cu-Al2O3 composite with 0.1 wt.% Al content exhibits remarkable thermo-stability in its microstructure due to the incorporation of Al2O3 nanoparticles, resulting in a significantly elevated softening temperature of up to 1000 °C and thereby demonstrating excellent resistance against softening. However, the observed phenomenon of softening after isothermal annealing at 1000 °C for 5 hours can be attributed to extensive recrystallization growth that promotes twin boundary formation, primarily caused by the weakening Zener pinning effect resulting from Oswald ripening of Al2O3 and rod-like Al2O3 formation.https://matsc.ktu.lt/index.php/MatSc/article/view/36919work hardeningcrystallographic texturesub-grain boundaryrecrystallizationrandom orientationtwin boundary |
| spellingShingle | Dongping ZHANG Peng WEI Hengju LI Zhihui CHEN Kuixian WEI The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content Medžiagotyra work hardening crystallographic texture sub-grain boundary recrystallization random orientation twin boundary |
| title | The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content |
| title_full | The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content |
| title_fullStr | The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content |
| title_full_unstemmed | The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content |
| title_short | The Nanoparticle-induced Zener Pinning Effect on Strain-softening in a Cold-Worked Cu-Al2O3 Composite with 0.1 wt.% Al Content |
| title_sort | nanoparticle induced zener pinning effect on strain softening in a cold worked cu al2o3 composite with 0 1 wt al content |
| topic | work hardening crystallographic texture sub-grain boundary recrystallization random orientation twin boundary |
| url | https://matsc.ktu.lt/index.php/MatSc/article/view/36919 |
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