Non-glide effects and dislocation core fields in BCC metals
作者机构：Institut Lumière MatièreUniversitéLyon 1-CNRSVilleurbanne F-69622France DEN-Service de Recherches de Métallurgie PhysiqueCEAUniversitéParis-SaclayGif-sur-Yvette F-91191France Institut Jean LamourCNRS UMR 7198Universitéde LorraineF-54000 NancyFrance DEN-Département des Matériaux pour le NucléaireCEAUniversitéParis-SaclayGif-sur-Yvette F-91191France
出 版 物：《npj Computational Materials》 (计算材料学（英文）)
年 卷 期：2019年第5卷第1期
页 面：178-185页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0701[理学-数学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
基 金：L.D.acknowledges support from LabEx DAMAS(program“Investissements d’Avenir”,ANR-11-LABX-0008-01) D.R.acknowledges support from LabEx iMUST(ANR-10-LABX-0064)of Universitéde Lyon(program“Investissements d’Avenir”,ANR-11-IDEX-0007) This work was performed using HPC resources from GENCI-CINES computer center under Grant No.A0040906821 and A0040910156 and from PRACE(Partnership for Advanced Computing in Europe)access to AIMODIM project
主 题：dislocation metals plasticity
摘 要：A hallmark of low-temperature plasticity in body-centered cubic(BCC)metals is its departure from Schmid’s *** aspect is that non-glide stresses,which do not produce any driving force on the dislocations,may affect the yield *** show here that this effect is due to a variation of the relaxation volume of the 1/2screw dislocations during *** predict quantitatively nonglide effects by modeling the dislocation core as an Eshelby inclusion,which couples elastically to the applied *** model explains the physical origin of the generalized yield criterion classically used to include non-Schmid effects in constitutive models of BCC *** use first-principles calculations to properly account for dislocation cores and use tungsten as a reference BCC ***,the methodology developed here applies to other BCC metals,other energy models and other solids showing nonglide effects.
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