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dc.contributor.authorMyhr, Ole Runar
dc.contributor.authorHopperstad, Odd Sture
dc.contributor.authorBørvik, Tore
dc.date.accessioned2018-09-14T08:54:38Z
dc.date.available2018-09-14T08:54:38Z
dc.date.created2018-08-31T12:36:24Z
dc.date.issued2018
dc.identifier.citationMetallurgical and Materials Transactions. A. 2018, 49 (8), 3592-3609.nb_NO
dc.identifier.issn1073-5623
dc.identifier.urihttp://hdl.handle.net/11250/2562619
dc.description.abstractIn this study, a combined precipitation, yield strength, and work hardening model for Al-Mg-Si alloys known as NaMo has been further developed to include the effects of strain rate and temperature on the resulting stress–strain behavior. The extension of the model is based on a comprehensive experimental database, where thermomechanical data for three different Al-Mg-Si alloys are available. In the tests, the temperature was varied between 20 °C and 350 °C with strain rates ranging from 10−6 to 750 s−1 using ordinary tension tests for low strain rates and a split-Hopkinson tension bar system for high strain rates, respectively. This large span in temperatures and strain rates covers a broad range of industrial relevant problems from creep to impact loading. Based on the experimental data, a procedure for calibrating the different physical parameters of the model has been developed, starting with the simplest case of a stable precipitate structure and small plastic strains, from which basic kinetic data for obstacle limited dislocation glide were extracted. For larger strains, when work hardening becomes significant, the dynamic recovery was linked to the Zener-Hollomon parameter, again using a stable precipitate structure as a basis for calibration. Finally, the complex situation of concurrent work hardening and dynamic evolution of the precipitate structure was analyzed using a stepwise numerical solution algorithm where parameters representing the instantaneous state of the structure were used to calculate the corresponding instantaneous yield strength and work hardening rate. The model was demonstrated to exhibit a high degree of predictive power as documented by a good agreement between predictions and measurements, and it is deemed well suited for simulations of thermomechanical processing of Al-Mg-Si alloys where plastic deformation is carried out at various strain rates and temperatures.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringer Verlagnb_NO
dc.titleA Combined Precipitation, Yield Stress, and Work Hardening Model for Al-Mg-Si Alloys Incorporating the Effects of Strain Rate and Temperaturenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber3592-3609nb_NO
dc.source.volume49nb_NO
dc.source.journalMetallurgical and Materials Transactions. Anb_NO
dc.source.issue8nb_NO
dc.identifier.doi10.1007/s11661-018-4675-3
dc.identifier.cristin1605815
dc.relation.projectNorges forskningsråd: 237885nb_NO
dc.relation.projectNorges forskningsråd: 250553nb_NO
dc.description.localcodeThis is a post-peer-review, pre-copyedit version of an article published in [Metallurgical and Materials Transactions. A] Locked until 21.5.2019 due to copyright restrictions. The final authenticated version is available online at: https://doi.org/10.1007/s11661-018-4675-3nb_NO
cristin.unitcode194,64,45,0
cristin.unitnameInstitutt for konstruksjonsteknikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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