Abstract
Magnesium and its alloys are used in many applications due to their high strength-to-weight ratios. The poor formability which is caused by lack of available slip systems and the existence of twinning has been the major hindrance in expanding their usage to other new applications. In order to improve the formability of magnesium and its alloys, it is critical to understand the characteristics of the available slip and twin systems and the interactions among them. The slip activities occur due to dislocation motions, and twinning and dislocation motions interact with each other in order to reduce the overall plastic dissipation energy in deformation. Since the complex interaction hardening among slip and twin modes is not automatically realized by conventional standard CP (crystal plasticity) theories, additional measures must be included in the crystal plasticity constitutive theory to accurately represent the mechanical behavior of magnesium and its alloys. This paper takes into account interaction hardening among slip and twin modes by employing an interaction hardening model based on a physical property (saturation strength), which reduces trials and errors significantly in the stress–strain data fitting process. Taking into account elastic anisotropy, a twinning CP theory is proposed and an implicit time integration scheme for the proposed anisotropic elasticity twinning CP theory is derived in this study. The derived CP theory and the implicit time integration scheme are implemented into a large deformation FE code, and the single crystal channel-die compression tests and polycrystal uniaxial tension/compression tests of magnesium done in [1] are successfully reproduced by simulations. Using the anisotropic elasticity twinning CP FE code, the effects of strong elastic anisotropy on the convergence and stability of CP FE codes are investigated. Strong elastic anisotropy turns out to lower the stability and accuracy of CP FE codes, and the proposed implicit time integration scheme successfully overcomes these difficulties caused by strong elastic anisotropy.
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Notes
The mathematical symbol \(<>\) is defined as follows. \(\begin{aligned}<A> = A, \;\; \mathrm{if} \; A> 0 \\ <A> = 0, \;\; \mathrm{if} \; A \le 0 \end{aligned}\)
In case the change in an explicitly updated variable is large, the residual in the NR loop, which is not fully implicit due to the explicitly updated variable, shows a linear decrease in the iteration vs logarithmic-error plot.
\(\delta _{ij}\) is the Kronecker delta function, which is defined as:
$$\begin{aligned} \delta _{ij} = \left\{ \begin{array}{l l} \displaystyle { 1 , \;\; \mathrm{if} \; i=j } \\ \displaystyle { 0 , \;\; \mathrm{if} \; i \ne j } \end{array} \right. \qquad \qquad \qquad \qquad \qquad (\mathrm{A}.2) \end{aligned}$$
References
Kelley, E.W., Hosford, W.F.: The plastic deformation of magnesium. Technical report, (1967)
Li, Hejie, Öchsner, Andreas, Yarlagadda, Prasad K.D .V., Xiao, Yin, Furushima, Tsuyoshi, Wei, Dongbin, Jiang, Zhengyi, Manabe, Ken-ichi: A new constitutive analysis of hexagonal close-packed metal in equal channel angular pressing by crystal plasticity finite element method. Contin. Mech. Thermodyn. 30, 69–82 (2018)
Sim, Gi-Dong, Kim, Gyuseok, Lavenstein, Steven, Hamza, Mohamed H., Fan, Haidong, El-Awady, Jaafar A.: Anomalous hardening in magnesium driven by a size-dependent transition in deformation modes. Acta Mater. 144, 11–20 (2018)
Hyun, C.S., Kim, M.S., Choi, S.-H., Shin, K.S.: Crystal plasticity FEM study of twinning and slip in a Mg single crystal by Erichsen test. Acta Mater. 156, 342–355 (2018)
Jiang, Lin, Kumar, M Arul, Beyerlein, Irene J, Wang, Xin, Zhang, Dalong, Wu, Chuandong, Cooper, Chase, Rupert, Timothy J, Mahajan, Subhash, Lavernia, Enrique J, Schoenung, Julie M: Twin formation from a twin boundary in Mg during in-situ nanomechanical testing. Mater. Sci. Eng. A 759, 142–153 (2019)
Huang, C., Elkhodary, K.I., Tang, S.: Resolving the diffusionless transformation process of twinning in single crystal plasticity theory. Int. J. Plast. 120, 220–247 (2019)
Sim, Gi-Dong, Xie, Kelvin Y., Hemker, Kevin J., El-Awady, Jaafar A.: Effect of temperature on the transition in deformation modes in mg single crystals. Acta Mater. 178, 241–248 (2019)
Kumar, MArul, Capolungo, L., McCabe, R.J., Tomé, C.N.: Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials. Sci. Rep. 9, 3846 (2019)
Zhang, K., Li, H., Liu, J.: Effect of yield surface distortion on the failure prediction of Mg alloy sheets. Arch. Appl. Mech. (2020). https://doi.org/10.1007/s00419-020-01760-w
Şerban, D.A., Marsavina, L., Rusu, L., Negru, R.: Numerical study of the behavior of magnesium alloy AM50 in tensile and torsional loadings. Arch. Appl. Mech. 89, 911–917 (2019)
Cheng, Jiahao, Shen, Jinlei, Mishra, Raj K., Ghosh, Somnath: Discrete twin evolution in Mg alloys using a novel crystal plasticity finite element model. Acta Mater. 149, 142–153 (2018)
Zhang, Hongjia, Jrusalem, Antoine, Salvati, Enrico, Papadaki, Chrysanthi, Fong, Kai Soon, Song, Xu, Korsunsky, Alexander M: Multi-scale mechanisms of twinning-detwinning in magnesium alloy AZ31B simulated by crystal plasticity modeling and validated via in situ synchrotron XRD and in situ SEM-EBSD. Int. J. Plast. 119, 43–56 (2019)
Wang, Baojie, Daokui, Xu, Sheng, Liyuan, Han, Enhou, Sun, Jie: Deformation and fracture mechanisms of an annealing-tailored “bimodal” grain-structured Mg alloy. J. Mater. Sci. Technol. 35, 2423–2429 (2019)
Nie, Huihui, Hao, Xinwei, Kang, Xiaoping, Chen, Hongsheng, Chi, Chengzhong, Liang, Wei: Strength and plasticity improvement of AZ31 sheet by pre-inducing large volume fraction of 10–12 tensile twins. Mater. Sci. Eng. A 776, 139045 (2020)
Yoshinaga, H., Horiuchi, R.: Deformation mechanisms in magnesium single crystals compressed in the direction parallel to hexagonal axis. Trans. Jpn. Inst. Met. 4, 1–8 (1963)
Obara, T., Yoshinga, H., Morozumi, S.: \(\{11{\bar{2}}2\} \left\langle 1123\right\rangle \) slip system in magnesium. Acta Metall. 21, 845–853 (1973)
Ando, S., Tonda, H.: Towards resolving the anonymity of pyramidal slip in magnesium. Mater. Trans., Jpn. Inst. Met. Mater. 41, 1188–1191 (2000)
Xie, K.Y., Alam, Z., Caffee, A., Hemker, K.J.: Pyramidal i slip in c-axis compressed mg single crystals. Scr. Mater. 112, 75–78 (2016)
Fan, H., El-Awady, J.A.: Towards resolving the anonymity of pyramidal slip in magnesium. Mater. Sci. Eng. A 644, 318–324 (2015)
Tang, Y., El-Awady, J.A.: Highly anisotropic slip-behavior of pyramidal i<c+a> dislocations in hexagonal close-packed magnesium. Mater. Sci. Eng. A 618, 424–432 (2014)
Graff, S., Brocks, W., Steglich, D.: Yielding of magnesium: from single crystal to polycrystalline aggregates. Int. J. Plast. 23, 1957–1978 (2007)
Zhang, J., Joshi, S.P.: Phenomenological crystal plasticity modeling and detailed micromechanical investigations of pure magnesium. J. Mech. Phys. Solids 60, 945–972 (2012)
Husser, Edgar, Bargmann, Swantje: Modeling twinning-induced lattice reorientation and slip-in-twin deformation. J. Mech. Phys. Solids 122, 315–339 (2019)
Vaishakh, K.V., Prasad, N.S., Narasimhan, R.: Numerical investigation of the origin of anomalous tensile twinning in magnesium alloys. J. Eng. Mater. Technol. 141, 031010-1-15 (2019)
Briffod, Fabien, Shiraiwa, Takayuki, Enoki, Manabu: Numerical investigation of the influence of twinning/detwinning on fatigue crack initiation in AZ31 magnesium alloy. Mater. Sci. Eng. A 753, 79–90 (2019)
Ren, Weijie, Xin, Renlong, Liu, Dejia: Modeling the strongly localized deformation behavior in a magnesium alloy with complicated texture distribution. Mater. Sci. Eng. A 762, 138103 (2019)
Kweon, S.: Edge cracking in rolling of an aluminum alloy AA2024-O. PhD thesis, University of Illinois Urbana-Champaign, Urbana, Illinois, (2009)
Kweon, S., Raja, Daniel S.: Investigation of the mechanical response of single crystal magnesium considering slip and twin. Int. J. Plast. 112, 1–17 (2019)
Kweon, S., Raja, Daniel S: Investigation of the effects of twinning on the mechanical response of polycrystal magnesium. Arch. Appl. Mech. 91, 1469–1493 (2021)
Kweon, S.: Damage at negative triaxiality. Eur. J. Mech. A/Solids 31, 203–212 (2012)
Marin, E.B., Dawson, P.R.: On modelling the elasto-viscoplastic response of metals using polycrystal plasticity. Comput. Methods Appl. Mech. Engrg. 165, 1–21 (1998)
Kweon, S.: Investigation of shear damage considering the evolution of anisotropy. J. Mech. Phys. Solids 61, 2605–2624 (2013)
Kweon, S., Raja, Daniel S: Comparison of anisotropy evolution in BCC and FCC metals using crystal plasticity and texture analysis. Eur. J. Mech. A/Solids 62, 22–38 (2017)
Hosford, W.F.: The Mechanics of Crystals and Textured Polycrystals. Oxford University Press, New York (1993)
Kocks, U.F., Mecking, H.: Physics and phenomenology of strain hardening: the fcc case. Prog. Mater. Sci. 48, 171–273 (2003)
Agnew, S.R., Yoo, M.H., Tomé, C.N.: Application of texture simulation to understanding mechanical behavior of mg and solid solution alloys containing li or y. Acta Mater. 49, 4277–4289 (2001)
Kelley, E.W., Hosford, W.F.: Plane-strain compression of magnesium and magnesium alloy crystals. Trans. Metall. Soc. AIME 242, 5–13 (1968)
Bertin, N., Tomé, C.N., Beyerlein, I.J., Barnett, M.R., Capolungo, L.: On the strength of dislocation interactions and their effect on latent hardening in pure magnesium. Int. J. Plast. 62, 72–92 (2014)
Morrow, B.M., Cerreta, E.K., McCabe, R.J., Tomé, C.N.: Toward understanding twin twin interactions in hcp metals: utilizing multiscale techniques to characterize deformation mechanisms in magnesium. Mater. Sci. Eng. A 613, 365–371 (2014)
Voigt, W.: Lehrbuch Der Kristallphysik. B. G. Teubner, Leipzig, Germany (1928)
Tromans, Desmond: Elastic anisotropy and hcp metal crystals and polycrystals. Int. J. Recent Res. Appl. Stud. (IJRRAS) 6(4), 462–483 (2011)
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The writers thank Southern Illinois University Edwardsville for providing a STEP (Seed grants for Transitional and Exploratory Projects) grant (“Investigation on the effect of anisotropy on the ductile fracture process of metals”), which supported this study.
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Appendix A. Jacobian matrix
Appendix A. Jacobian matrix
The expressions for components of the Jacobian matrix \(\bigg [ \frac{\partial [{{\mathbf {R}}}]}{\partial [{{\mathbf {V}}}]} \bigg ]\) are provided as follows:
where \(\mathbb {S}\) denotes the fourth order identity matrix, i.e., \(\mathbb {S}_{ijkl} = \frac{1}{2}(\delta _{ik} \delta _{jl} + \delta _{il} \delta _{jk} )\),Footnote 4 and the fourth-order tensor \(\frac{\partial \hat{{{\mathbf {D}}}}^\mathrm{p}}{\partial \varvec{\varepsilon }^*} \) is defined as
and the fourth-order tensor \({\mathcal {N}}\) is defined as:
where \( {\mathbf {0}}_{( 9 \mathrm{x} N_{tw})}\) denotes a zero tensor of which dimension is 9 by \(N_{tw}\) and components are all zero.
Note that \(N^{(i)}\) is the number of systems in a slip or twin mode.
where \(\delta _{1-6,\alpha }\) and \(\delta _{7-12,\alpha }\) are defined as follows:
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Kweon, S., Raja, D.S. A study on the mechanical response of magnesium using an anisotropic elasticity twinning CP FEM. Arch Appl Mech 91, 4239–4261 (2021). https://doi.org/10.1007/s00419-021-02006-z
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DOI: https://doi.org/10.1007/s00419-021-02006-z