1.Introduction High strength and large deformability are greatly desirable for advanced structural metallic materials.Typically strengthening methods in crystalline materials rely on controlling the generation,propaga...1.Introduction High strength and large deformability are greatly desirable for advanced structural metallic materials.Typically strengthening methods in crystalline materials rely on controlling the generation,propagation,and intersection of dislocations by introducing various internal defects[1-4].展开更多
The nanolaminated materials generally exhibit poor plasticity due to the fast onset of shear instability.Engineering interface structure is an eff ective approach for enhancing plasticity via postponing or suppressing...The nanolaminated materials generally exhibit poor plasticity due to the fast onset of shear instability.Engineering interface structure is an eff ective approach for enhancing plasticity via postponing or suppressing the shear instability.Here,we introduce 4 nm thick CuNb 3D amorphous interface layers and Nb 3D crystalline interface layers in Cu nanolaminated materials,respectively.In situ micro-pillar compression tests show that samples with crystalline interface layers exhibit shear instability,while the samples with amorphous interface layers display uniform deformation.Since the plastic deformation of the singlecrystal crystalline interface layer is anisotropic,except for well-aligned slip systems,dislocations on other slip systems have a poor ability to transmit the 3D crystalline interface layer,leading to localized dislocations pileups and shear instability.In contrast,the amorphous interface layer which is plastically isotropic accommodates dislocations from arbitrary slip systems of the matrix,which can alleviate the stress concentrations at the interface,and thus suppresses the shear instability.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52002109,52071124)the key project of Natural Science Foundation of Tianjin(No.20JCZDJC00440)+2 种基金the key project of Natural Science Foundation of Hebei(No.E2021202135)the Central Funds Guiding the Local Science and Technology Development of Hebei Province(Nos.226Z1001G and 226Z1012G)the Innovation Funding Project for Postgraduate of the Hebei Province(No.GXZZSS2023028).
文摘1.Introduction High strength and large deformability are greatly desirable for advanced structural metallic materials.Typically strengthening methods in crystalline materials rely on controlling the generation,propagation,and intersection of dislocations by introducing various internal defects[1-4].
基金financially supported by the National Natural Science Foundation of China(Nos.51771201,52071124)the Key Project of Natural Science Foundation of Hebei(No.E2021202135)+2 种基金the Key Project of Natural Science Foundation of Tianjin(No.20JCZDJC00440)the Central Funds Guiding the Local Science and Technology Development of Hebei Province(No.226Z1001G and 226Z1012G)the Open Research Fund from the State Key Laboratory of Rolling and Automation,Northeastern University,Grant No.:2020RALKFKT002。
文摘The nanolaminated materials generally exhibit poor plasticity due to the fast onset of shear instability.Engineering interface structure is an eff ective approach for enhancing plasticity via postponing or suppressing the shear instability.Here,we introduce 4 nm thick CuNb 3D amorphous interface layers and Nb 3D crystalline interface layers in Cu nanolaminated materials,respectively.In situ micro-pillar compression tests show that samples with crystalline interface layers exhibit shear instability,while the samples with amorphous interface layers display uniform deformation.Since the plastic deformation of the singlecrystal crystalline interface layer is anisotropic,except for well-aligned slip systems,dislocations on other slip systems have a poor ability to transmit the 3D crystalline interface layer,leading to localized dislocations pileups and shear instability.In contrast,the amorphous interface layer which is plastically isotropic accommodates dislocations from arbitrary slip systems of the matrix,which can alleviate the stress concentrations at the interface,and thus suppresses the shear instability.
