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Research Papers

Simulating Size and Volume Fraction-Dependent Strength and Ductility of Nanotwinned Composite Copper

[+] Author and Article Information
Linli Zhu

Department of Engineering Mechanics,
Zhejiang University, and Key Laboratory of Soft
Machines and Smart Devices
of Zhejiang Province,
Hangzhou 310027,
Zhejiang Province, China
e-mail: llzhu@zju.edu.cn

Xiang Guo

School of Mechanical Engineering,
Tianjin University, and Tianjin Key Laboratory
of Nonlinear Dynamics and Control,
Tianjin 300072, China

Haihui Ruan

Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
Kowloon, Hong Kong, China

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received December 22, 2015; final manuscript received April 28, 2016; published online May 11, 2016. Assoc. Editor: A. Amine Benzerga.

J. Appl. Mech 83(7), 071009 (May 11, 2016) (8 pages) Paper No: JAM-15-1694; doi: 10.1115/1.4033519 History: Received December 22, 2015; Revised April 28, 2016

This work presents a micromechanical model to investigate mechanical properties of nanotwinned dual-phase copper, consisting of the coarse grained phase and the nanotwinned phase. Both strengthening mechanisms of nanotwinning and the contributions of nanovoids/microcracks have been taken into account in simulations. With the aid of modified mean-field approach, the stress–strain relationship is derived by combining the constitutive relations of the coarse grained phase and the nanotwinned phase. Numerical results show that the proposed model enables us to describe the mechanical properties of the nanotwinned composite copper, including both yield strength and ductility. The calculations based on the proposed model agree well with the results from finite element method (FEM). The predicted yield strength and ductility are sensitive to the twin spacing, grain size, as well as the volume fractions of phases in this composite copper. These results will benefit the optimization of both strength and ductility by controlling constituent fractions and the size of the microstructures in metallic materials.

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Figures

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Fig. 1

Schematic drawings of the nanotwinned composite metals in the polycrystalline materials with the assumption of the composite model (a) and of nano/microscale defects such as the nano/microcracks arising during tensile testing (b)

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Fig. 2

Comparison of the stress–strain relationship between the present simulations and FEM results [29,55] for nanotwinned composite copper. A, C, D, E, F represent the different distribution of nanotwinned phase in the composite copper, as indicated in Ref. [29,55]

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Fig. 3

The stress–strain relationship of the nanotwinned composite copper with different reference density of nano/microcracks (a) and the failure strain as a function of the reference density R0 (b)

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Fig. 4

Influence of the Weibull modulus on the stress–strain response of nanotwinned composite copper (a) and the failure strain varying with Weibull modulus M (b)

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Fig. 5

Stress–strain response of nanotwinned composite copper with different volume fraction of the coarse grained phase (a), and the yield strength (b) and failure strain (c) varying with the volume fraction of coarse grains

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Fig. 6

Stress–strain relationship of nanotwinned composite copper with different twin spacing (a), and the yield strength (b) and failure strain (c) as functions of the twin spacing

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Fig. 7

Stress–strain response of nanotwinned composite copper with different grain size in nanotwinned phase (a), and the yield strength (b) and failure strain (c) as the functions of the grain size dGTB

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