Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy
Processing heterogeneous microstructures, especially the so-called harmonic structures consisting of soft core and hard shell regions, is an efficient way to achieve a strength-ductility trade-off in classical metallurgy. In this study, two harmonic samples with the same composition of Ti–24Nb–4Zr–8...
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| Format: | Article |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423017805 |
| _version_ | 1797646737738825728 |
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| author | Benoît Fer David Tingaud Jenő Gubicza Nguyen Quang Chinh Yulin Hao Fabien Cazes Frédéric Prima Guy Dirras |
| author_facet | Benoît Fer David Tingaud Jenő Gubicza Nguyen Quang Chinh Yulin Hao Fabien Cazes Frédéric Prima Guy Dirras |
| author_sort | Benoît Fer |
| collection | DOAJ |
| description | Processing heterogeneous microstructures, especially the so-called harmonic structures consisting of soft core and hard shell regions, is an efficient way to achieve a strength-ductility trade-off in classical metallurgy. In this study, two harmonic samples with the same composition of Ti–24Nb–4Zr–8Sn but different microstructures were processed to exhibit different grain size heterogeneities between the core and the shell. Both samples were consolidated from a ball-milled powder using Spark Plasma Sintering (SPS) but applying two different sintering times, 1 and 60 min. The grain size heterogeneities were higher for the longer SPS sintering time due to the enhanced grain dimension in the core for 60 min consolidation time. The mechanical behavior of the two materials was studied via a monotonic quasi-static compression test. For both harmonic-structured Ti–24Nb–4Zr–8Sn alloys, a high compressive proof stress of about 1 GPa was detected. The strain-hardening rate was higher for the longer SPS time due to the higher grain size differences between the core and shell. A high dislocation density was detected in both materials after compression deformation (several tens of 1014 m−2). The dislocations tend to form cells and LAGBs during compression. The dislocation pile-ups at the core-shell interfaces caused a back stress of about 640 MPa after compression at 2–5% strains. The contributions of the different features of the microstructure (grain size, α phase precipitates, and oxygen concentration) to the proof stress were determined. |
| first_indexed | 2024-03-11T15:07:03Z |
| format | Article |
| id | doaj.art-ae710796112c4b6282b6fe8ddca1deb9 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:07:03Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-ae710796112c4b6282b6fe8ddca1deb92023-10-30T06:02:56ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012612601275Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloyBenoît Fer0David Tingaud1Jenő Gubicza2Nguyen Quang Chinh3Yulin Hao4Fabien Cazes5Frédéric Prima6Guy Dirras7Université Sorbonne Paris Nord, Laboratoire de Sciences des Procédés et des Matériaux, CNRS, UPR 3407, 93430 Villetaneuse, France; PSL University, Chimie ParisTech, CNRS, Institut de Recherche de Chimie Paris, Paris 75005, France; Corresponding author.Université Sorbonne Paris Nord, Laboratoire de Sciences des Procédés et des Matériaux, CNRS, UPR 3407, 93430 Villetaneuse, FranceDepartment of Materials Physics, Eötvös Loránd University, Budapest, POB 32, H-1518, Hungary; Corresponding author. Department of Materials Physics, Eötvös Loránd University, Budapest, POB 32, H-1518, Hungary.Department of Materials Physics, Eötvös Loránd University, Budapest, POB 32, H-1518, HungaryShi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaUniversité Sorbonne Paris Nord, Laboratoire de Sciences des Procédés et des Matériaux, CNRS, UPR 3407, 93430 Villetaneuse, FrancePSL University, Chimie ParisTech, CNRS, Institut de Recherche de Chimie Paris, Paris 75005, FranceUniversité Sorbonne Paris Nord, Laboratoire de Sciences des Procédés et des Matériaux, CNRS, UPR 3407, 93430 Villetaneuse, FranceProcessing heterogeneous microstructures, especially the so-called harmonic structures consisting of soft core and hard shell regions, is an efficient way to achieve a strength-ductility trade-off in classical metallurgy. In this study, two harmonic samples with the same composition of Ti–24Nb–4Zr–8Sn but different microstructures were processed to exhibit different grain size heterogeneities between the core and the shell. Both samples were consolidated from a ball-milled powder using Spark Plasma Sintering (SPS) but applying two different sintering times, 1 and 60 min. The grain size heterogeneities were higher for the longer SPS sintering time due to the enhanced grain dimension in the core for 60 min consolidation time. The mechanical behavior of the two materials was studied via a monotonic quasi-static compression test. For both harmonic-structured Ti–24Nb–4Zr–8Sn alloys, a high compressive proof stress of about 1 GPa was detected. The strain-hardening rate was higher for the longer SPS time due to the higher grain size differences between the core and shell. A high dislocation density was detected in both materials after compression deformation (several tens of 1014 m−2). The dislocations tend to form cells and LAGBs during compression. The dislocation pile-ups at the core-shell interfaces caused a back stress of about 640 MPa after compression at 2–5% strains. The contributions of the different features of the microstructure (grain size, α phase precipitates, and oxygen concentration) to the proof stress were determined.http://www.sciencedirect.com/science/article/pii/S2238785423017805Titanium alloyHarmonic structureSpark Plasma SinteringDislocationsPlasticity mechanismsHetero-deformation induced stress |
| spellingShingle | Benoît Fer David Tingaud Jenő Gubicza Nguyen Quang Chinh Yulin Hao Fabien Cazes Frédéric Prima Guy Dirras Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy Journal of Materials Research and Technology Titanium alloy Harmonic structure Spark Plasma Sintering Dislocations Plasticity mechanisms Hetero-deformation induced stress |
| title | Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy |
| title_full | Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy |
| title_fullStr | Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy |
| title_full_unstemmed | Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy |
| title_short | Microstructure evolution and deformation mechanisms during compression of a harmonic–structured Ti–24Nb–4Zr–8Sn alloy |
| title_sort | microstructure evolution and deformation mechanisms during compression of a harmonic structured ti 24nb 4zr 8sn alloy |
| topic | Titanium alloy Harmonic structure Spark Plasma Sintering Dislocations Plasticity mechanisms Hetero-deformation induced stress |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423017805 |
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