TY - JOUR
T1 - Dislocation-mediated strain hardening in tungsten: Thermo-mechanical plasticity theory and experimental validation
AU - Terentyev, Dmitry
AU - Xiao, Xiazi
AU - Dubinko, Andrii
AU - Bakaeva, Anastasiia
AU - Duan, Huiling
N1 - Score=10
PY - 2015/8/28
Y1 - 2015/8/28
N2 - A self-consistentthermo-mechanicalmodeltostudythestrain-hardeningbehaviorof polycrystallinetungstenwasdevelopedandvalidatedbyadedicatedexperimentalroute. Dislocation–dislocationmultiplicationandstorage,aswelldislocation-grainboundary
(GB)pinningwerethemajormechanismsunderlyingtheevolutionofplasticdeformation, thus providingalinkbetweenthestrainhardeningbehaviorandmaterial'smicro- structure.Themicrostructureofthepolycrystallinetungstensampleshasbeenthoroughly
investigatedbyscanningandelectronmicroscopy.Themodelwasappliedtocompute stress–strain loadingcurvesofcommercialtungstengrades,intheas-receivedandas- annealedstates,inthetemperaturerangeof500–1000 °C. Fittingthemodeltothein-
dependentexperimentalresultsobtainedusingasinglecrystalandas-receivedpoly-crystalline tungsten,themodeldemonstrateditscapabilitytopredictthedeformation behavior ofas-annealedsamplesinawidetemperaturerangeandappliedstrain.The
relevanceofthedislocation-mediatedplasticitymechanismsusedinthemodelhavebeen validatedusingtransmissionelectronmicroscopyexaminationofthesamplesdeformed up todifferentamountsofstrain.Onthebasisoftheexperimentalvalidation,thelim-
itationsofthemodelaredeterminedanddiscussed.
AB - A self-consistentthermo-mechanicalmodeltostudythestrain-hardeningbehaviorof polycrystallinetungstenwasdevelopedandvalidatedbyadedicatedexperimentalroute. Dislocation–dislocationmultiplicationandstorage,aswelldislocation-grainboundary
(GB)pinningwerethemajormechanismsunderlyingtheevolutionofplasticdeformation, thus providingalinkbetweenthestrainhardeningbehaviorandmaterial'smicro- structure.Themicrostructureofthepolycrystallinetungstensampleshasbeenthoroughly
investigatedbyscanningandelectronmicroscopy.Themodelwasappliedtocompute stress–strain loadingcurvesofcommercialtungstengrades,intheas-receivedandas- annealedstates,inthetemperaturerangeof500–1000 °C. Fittingthemodeltothein-
dependentexperimentalresultsobtainedusingasinglecrystalandas-receivedpoly-crystalline tungsten,themodeldemonstrateditscapabilitytopredictthedeformation behavior ofas-annealedsamplesinawidetemperaturerangeandappliedstrain.The
relevanceofthedislocation-mediatedplasticitymechanismsusedinthemodelhavebeen validatedusingtransmissionelectronmicroscopyexaminationofthesamplesdeformed up todifferentamountsofstrain.Onthebasisoftheexperimentalvalidation,thelim-
itationsofthemodelaredeterminedanddiscussed.
KW - Tungsten
KW - Crystal plasticity
KW - Hardening
KW - Dislocations
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/26871216
U2 - 10.1016/j.jmps.2015.08.015
DO - 10.1016/j.jmps.2015.08.015
M3 - Article
VL - 85
SP - 1
EP - 15
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
ER -