Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior
The influence of the grain sizes ranging from 23.4 to 69.2 μm on mechanical properties of Cu-3wt.%Ag-0.5 wt%Zr thin sheets was investigated by conducting uniaxial tensile experiments at room temperature (RT 298 K) and cryogenic temperature (CT 77 K). At RT, the strength and ductility of the sheet de...
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424006380 |
| _version_ | 1827216668117434368 |
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| author | Han Wang Peng Zhang ChuanJie Wang Qiang Zhu Gang Chen |
| author_facet | Han Wang Peng Zhang ChuanJie Wang Qiang Zhu Gang Chen |
| author_sort | Han Wang |
| collection | DOAJ |
| description | The influence of the grain sizes ranging from 23.4 to 69.2 μm on mechanical properties of Cu-3wt.%Ag-0.5 wt%Zr thin sheets was investigated by conducting uniaxial tensile experiments at room temperature (RT 298 K) and cryogenic temperature (CT 77 K). At RT, the strength and ductility of the sheet decreased as the grain size increased, and the size effect on flow stress was observed when the ratio of thickness to grain size (t/d) was less than 4.5. At CT, the sheet exhibited excellent strength and ducility, accompanied by a reduction in the size effect on flow stress. GND distribution maps showed that the average GND density of grains in the sample surface (surface grains) was lower than that of grains in the core of the sample (core grains). As the distance from the grain boundary increased, the GND density decreased. A constitutive model was developed for Cu-3wt.%Ag-0.5 wt%Zr thin sheets based on the dislocation accumulation and recovery process, which was able to predict the effects of grain size and deformation temperature on the flow stress and GND evolution in Cu-3wt.%Ag-0.5 wt%Zr thin sheets. This constitutive model indicated that CT not only inhibited the GND recovery process but likewise promoted the GND accumulation process. The established constitutive model revealed that the ratio of SSD density to GND density increased with increasing strain. The total dislocation density and GND density of samples deformed at CT was higher than those of samples deformed at RT. |
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| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2025-03-21T15:06:46Z |
| publishDate | 2024-05-01 |
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| series | Journal of Materials Research and Technology |
| spelling | doaj.art-4edfd4a3684c4ef79dc789cd062e42ff2024-06-20T06:52:36ZengElsevierJournal of Materials Research and Technology2238-78542024-05-0130823832Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behaviorHan Wang0Peng Zhang1ChuanJie Wang2Qiang Zhu3Gang Chen4School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 Wenhuaxi Road, Weihai 264209, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 Wenhuaxi Road, Weihai 264209, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 Wenhuaxi Road, Weihai 264209, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 Wenhuaxi Road, Weihai 264209, ChinaCorresponding author.; School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 Wenhuaxi Road, Weihai 264209, ChinaThe influence of the grain sizes ranging from 23.4 to 69.2 μm on mechanical properties of Cu-3wt.%Ag-0.5 wt%Zr thin sheets was investigated by conducting uniaxial tensile experiments at room temperature (RT 298 K) and cryogenic temperature (CT 77 K). At RT, the strength and ductility of the sheet decreased as the grain size increased, and the size effect on flow stress was observed when the ratio of thickness to grain size (t/d) was less than 4.5. At CT, the sheet exhibited excellent strength and ducility, accompanied by a reduction in the size effect on flow stress. GND distribution maps showed that the average GND density of grains in the sample surface (surface grains) was lower than that of grains in the core of the sample (core grains). As the distance from the grain boundary increased, the GND density decreased. A constitutive model was developed for Cu-3wt.%Ag-0.5 wt%Zr thin sheets based on the dislocation accumulation and recovery process, which was able to predict the effects of grain size and deformation temperature on the flow stress and GND evolution in Cu-3wt.%Ag-0.5 wt%Zr thin sheets. This constitutive model indicated that CT not only inhibited the GND recovery process but likewise promoted the GND accumulation process. The established constitutive model revealed that the ratio of SSD density to GND density increased with increasing strain. The total dislocation density and GND density of samples deformed at CT was higher than those of samples deformed at RT.http://www.sciencedirect.com/science/article/pii/S2238785424006380Constitutive modelGeometrically necessary dislocationDeformation temperatureSize effectDislocation evolutionCu-3wt.%Ag-0.5 wt%Zr alloy |
| spellingShingle | Han Wang Peng Zhang ChuanJie Wang Qiang Zhu Gang Chen Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior Journal of Materials Research and Technology Constitutive model Geometrically necessary dislocation Deformation temperature Size effect Dislocation evolution Cu-3wt.%Ag-0.5 wt%Zr alloy |
| title | Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| title_full | Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| title_fullStr | Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| title_full_unstemmed | Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| title_short | Investigation of size effect on flow stress of Cu-3wt.%Ag-0.5 wt%Zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| title_sort | investigation of size effect on flow stress of cu 3wt ag 0 5 wt zr thin sheets at room and cryogenic temperature based on geometrically necessary dislocation evolution behavior |
| topic | Constitutive model Geometrically necessary dislocation Deformation temperature Size effect Dislocation evolution Cu-3wt.%Ag-0.5 wt%Zr alloy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424006380 |
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