Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order
Abstract The plastic response of the Senkov HfNbTaTiZr high-entropy alloy is explored by means of simulated nanoindentation tests. Both a random alloy and an alloy with chemical short-range order are investigated and compared to the well understood case of an elementary Ta crystal. Strong difference...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-04-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-024-59761-6 |
| _version_ | 1797199476168851456 |
|---|---|
| author | Iyad Alabd Alhafez Orlando R. Deluigi Diego Tramontina Nina Merkert Herbert M. Urbassek Eduardo M. Bringa |
| author_facet | Iyad Alabd Alhafez Orlando R. Deluigi Diego Tramontina Nina Merkert Herbert M. Urbassek Eduardo M. Bringa |
| author_sort | Iyad Alabd Alhafez |
| collection | DOAJ |
| description | Abstract The plastic response of the Senkov HfNbTaTiZr high-entropy alloy is explored by means of simulated nanoindentation tests. Both a random alloy and an alloy with chemical short-range order are investigated and compared to the well understood case of an elementary Ta crystal. Strong differences in the dislocation plasticity between the alloys and the elementary Ta crystal are found. The high-entropy alloys show only little relaxation of the indentation dislocation network after indenter retraction and only negligible dislocation emission into the sample interior. Short-range order—besides making the alloy both stiffer and harder—further increases the size of the plastic zone and the dislocation density there. These features are explained by the slow dislocation migration in these alloys. Also, the short-range-ordered alloy features no twinning plasticity in contrast to the random alloy, while elemental Ta exhibits twinning under high stress but detwins considerably under stress relief. The results are in good qualitative agreement with our current knowledge of plasticity in high-entropy alloys. |
| first_indexed | 2024-04-24T07:16:21Z |
| format | Article |
| id | doaj.art-7929682aeaa1406693ae05c50322816a |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T07:16:21Z |
| publishDate | 2024-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-7929682aeaa1406693ae05c50322816a2024-04-21T11:15:34ZengNature PortfolioScientific Reports2045-23222024-04-0114111310.1038/s41598-024-59761-6Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range orderIyad Alabd Alhafez0Orlando R. Deluigi1Diego Tramontina2Nina Merkert3Herbert M. Urbassek4Eduardo M. Bringa5Institute of Applied Mechanics, Clausthal University of TechnologyCONICET and Facultad de Ingeniería, Universidad de MendozaCONICET and Facultad de Ingeniería, Universidad de MendozaInstitute of Applied Mechanics, Clausthal University of TechnologyPhysics Department and Research Center OPTIMAS, University of Kaiserslautern-LandauCONICET and Facultad de Ingeniería, Universidad de MendozaAbstract The plastic response of the Senkov HfNbTaTiZr high-entropy alloy is explored by means of simulated nanoindentation tests. Both a random alloy and an alloy with chemical short-range order are investigated and compared to the well understood case of an elementary Ta crystal. Strong differences in the dislocation plasticity between the alloys and the elementary Ta crystal are found. The high-entropy alloys show only little relaxation of the indentation dislocation network after indenter retraction and only negligible dislocation emission into the sample interior. Short-range order—besides making the alloy both stiffer and harder—further increases the size of the plastic zone and the dislocation density there. These features are explained by the slow dislocation migration in these alloys. Also, the short-range-ordered alloy features no twinning plasticity in contrast to the random alloy, while elemental Ta exhibits twinning under high stress but detwins considerably under stress relief. The results are in good qualitative agreement with our current knowledge of plasticity in high-entropy alloys.https://doi.org/10.1038/s41598-024-59761-6Molecular dynamicsNanoindentationDislocationsPlasticityHigh-entropy alloys |
| spellingShingle | Iyad Alabd Alhafez Orlando R. Deluigi Diego Tramontina Nina Merkert Herbert M. Urbassek Eduardo M. Bringa Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order Scientific Reports Molecular dynamics Nanoindentation Dislocations Plasticity High-entropy alloys |
| title | Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order |
| title_full | Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order |
| title_fullStr | Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order |
| title_full_unstemmed | Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order |
| title_short | Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy—an atomistic study of the effect of short-range order |
| title_sort | nanoindentation into a bcc high entropy hfnbtatizr alloy an atomistic study of the effect of short range order |
| topic | Molecular dynamics Nanoindentation Dislocations Plasticity High-entropy alloys |
| url | https://doi.org/10.1038/s41598-024-59761-6 |
| work_keys_str_mv | AT iyadalabdalhafez nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder AT orlandordeluigi nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder AT diegotramontina nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder AT ninamerkert nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder AT herbertmurbassek nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder AT eduardombringa nanoindentationintoabcchighentropyhfnbtatizralloyanatomisticstudyoftheeffectofshortrangeorder |