首页|Superior strength-ductility combination resulted from hetero-zone boundary affected region in Cu-Fe layered material
Superior strength-ductility combination resulted from hetero-zone boundary affected region in Cu-Fe layered material
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The hetero-zone boundary affected region(HBAR)significantly influences the mechanical behaviors of layered materials,where the deformation mechanisms differ from those in the bulk layers.In this study,three kinds of heterogeneous Cu-Fe layered materials with different interface spacing but identical total thicknesses were prepared.The effects of HBAR and strain partitioning on the tensile behavior of the lay-ered materials were investigated.The results showed that layered materials had enhanced yield strength and uniform elongation with decreasing interface spacing.During tensile deformation,geometrically nec-essary dislocations(GNDs)were generated at hetero-zone boundaries and piled up near them,resulting in hetero-deformation induced(HDI)strengthening and HDI work hardening.Surface profilometry mea-surements showed that the Cu and Fe layers exhibited obvious strain partitioning and mutual constraint.With decreasing interface spacing,strain partitioning is enhanced by interlayer constraint,which pre-vented strain localization at interfaces and thus improved the synergetic deformation of layers.A higher fraction of HBAR can improve the mechanical performance of heterogeneous layered materials.This study deepens our understanding of the relationship between HBAR and strength-ductility synergy and provides some insight into the design of layered materials.
School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,China
Department of Materials Science and Engineering Kyoto University,Yoshida Honmachi,Sakyo-ku,Kyoto 606-8501,Japan
Elements Strategy Initiative for Structural Materials(ESISM),Kyoto University,Yoshida Honmachi,Sakyo-ku,Kyoto 606-8501,Japan
Department of Materials Science and Engineering City University of Hong Kong Hong Kong China
Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province,Sichuan University,Chengdu 610065,China
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国家自然科学基金国家自然科学基金中央高校基本科研业务费专项中国博士后科学基金Elements Strategy Initiative for Structural MaterialsGrantin-Aid for Scientific Research(A)through the Ministry of Education,Culture,Sports,Science and Technology(MEXT),Japan
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