TY - JOUR
T1 - Microstructure-Property Relations in the Tensile Behavior of Bimodal Nanostructured Metals
AU - Guo, Xiang
AU - Liu, Yang
AU - Weng, George J.
AU - Zhu, Linli
AU - Lu, Jian
AU - Chen, Gang
N1 - Funding Information:
The authors wish to thank two anonymous reviewers for their helpful comments. This work was supported by National Key Research and Development Plan of China (grant no. 2018YFC0808800) and the Major Program of National Natural Science Foundation of China (grant no. 51590892). X.G. also acknowledges the Tianjin Research Program of Application Foundation and Advanced Technology (grant no. 18JCYBJC20300). G.J.W. thanks the support of NSF Mechanics of Materials Program under CMMI-1162431. L.Z. also acknowledges the National Natural Science Foundation of China (grant no. 11472243) and the Fundamental Research Funds for the Central Universities (2018XZZX001-05).
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/6/1
Y1 - 2020/6/1
N2 - Bimodal nanostructured (NS) metals realize the superior strength due to the strengthening of nanograined (NG) matrix, whereas their high ductility arises from the toughening of coarse-grained (CG) inclusions. Their overall strength and ductility can be influenced by 1) the fracture properties of CG and NG phases, 2) the distribution of CG inclusions, and 3) interfaces. Herein, a 3D cohesive finite element framework is built up and three classes of cohesive elements are developed: 1) cohesive elements embedded into the CG phase, 2) those embedded at the CG–NG interfaces, and 3) those embedded into the NG phase, to examine the tensile fracture of the bimodal NS Cu. The results indicate that the cohesive strength of NG phase is decisive to the overall performances and it also affects the roles of both the cohesive strength of CG phase and the distribution of CG inclusions. When the CG inclusions are array-arranged in the interior of the entire microstructure, the best overall strength and ductility can be obtained. In addition to these, both the strength and ductility of the bimodal NS Cu get stabilized when the cohesive strength and the fracture energy of interfaces are larger than those of CG phase.
AB - Bimodal nanostructured (NS) metals realize the superior strength due to the strengthening of nanograined (NG) matrix, whereas their high ductility arises from the toughening of coarse-grained (CG) inclusions. Their overall strength and ductility can be influenced by 1) the fracture properties of CG and NG phases, 2) the distribution of CG inclusions, and 3) interfaces. Herein, a 3D cohesive finite element framework is built up and three classes of cohesive elements are developed: 1) cohesive elements embedded into the CG phase, 2) those embedded at the CG–NG interfaces, and 3) those embedded into the NG phase, to examine the tensile fracture of the bimodal NS Cu. The results indicate that the cohesive strength of NG phase is decisive to the overall performances and it also affects the roles of both the cohesive strength of CG phase and the distribution of CG inclusions. When the CG inclusions are array-arranged in the interior of the entire microstructure, the best overall strength and ductility can be obtained. In addition to these, both the strength and ductility of the bimodal NS Cu get stabilized when the cohesive strength and the fracture energy of interfaces are larger than those of CG phase.
KW - bimodal nanostructured metals
KW - cohesive elements
KW - interfaces
KW - strength and ductility
KW - three-dimensional
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U2 - 10.1002/adem.202000097
DO - 10.1002/adem.202000097
M3 - Article
AN - SCOPUS:85082440017
SN - 1438-1656
VL - 22
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 6
M1 - 2000097
ER -