Line Dislocation Dynamics Simulations with Complex Physics
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Discrete dislocation dynamics (DDD) simulations provide a technique for examining the effects of fundamental dislocation physics on the plastic response of crystalline solids. Many DDD simulations focus on relatively “simple” materials and loading conditions, such as glide-motion-dominated plasticity of pure cubic crystals. The goal of this chapter is to provide an overview of the more “complex” physical aspects of dislocation-mediated plasticity in the context of DDD. We consider both physics that are intrinsic to the crystal lattice (elastic anisotropy, nonlinear drag, and low crystallographic symmetry) and extrinsic physics that are due to defects other than dislocations (solutes, vacancies, precipitates, and grain boundaries). For each of these classes of physics, we first discuss the conditions under which they are relevant, followed by an examination of the fundamental ways in which the behaviors of dislocations are affected by the physics, and finally a presentation of the methods that have been developed for incorporating the physics in DDD. We end the chapter by discussing three example simulations where complex physics are consequential.
This paper describes objective technical results and analysis. Any subjective views of opinions that might be expressed in this paper do not necessarily represent the views of the U. S. Department of Energy of the United States Government.
- Agnew S, Horton J, MH Y (2002) Transmission electron microscopy investigation of <c+a> dislocations in mg and α-solids solution Mg-Li alloys. Metall Mater Trans A 33A:851Google Scholar
- Argon AS (2008) Strengthening mechanisms in crystal plasticity. Oxford University Press, OxfordGoogle Scholar
- Delafosse D (2012) Hydrogen effects on the plasticity of face centred cubic (FCC) crystals, chap 9. In: Gangloff RP, Somerday BP (eds) Gaseous hydrogen embrittlement of materials in energy technologies. Mechanisms, modelling and future developments, vol 2. Woodhead Publishing Limited, Cambridge, pp 247–285CrossRefGoogle Scholar
- Eshelby JD (1961) Elastic inclusions and inhomogeneities, chap 3. In: Sneddon IN, Hill R (eds) Progress in solid mechanics, vol II. North-Holland Publishing Company, Amsterdam, pp 87–140Google Scholar
- Hull D, Bacon DJ (2011) Introduction to dislocations. Butterworth-Heinemann, OxfordGoogle Scholar
- Kubin LP, Canova G, Condat M, Devincre B, Pontikis V, Bréchet Y (1992) Dislocation microstructures and plastic flow: a 3D simulation. Solid State Phenom 23 & 24:455–472Google Scholar
- Mohles V (2004) Dislocation dynamics simulations of particle strengthening, chap 17. In: Raabe D, Roters F, Barlat F, Chen LQ (eds) Continuum scale simulation of engineering materials. Wiley-VCH Verlag GmbH & Co., Weinheim, pp 368–388Google Scholar
- Reed-Hill RE, Abbaschian R (1992) Physical metallurgy principles. PWS-Kent, BostonGoogle Scholar
- Sills RB (2016) Dislocation dynamics of face-centered cubic metals and alloys. PhD thesis, Stanford UniversityGoogle Scholar
- Ventelon L, Lüthi B, Clouet E, Proville L, Legrand B, Rodney D, Willaime F (2015) Dislocation core reconstruction induced by cargon segregation in BCC iron. Phys Rev B 91:220102_1–5Google Scholar
- Weinberger CR, Aubry S, Lee SW, Cai W (2009a) Dislocation dynamics simulations in a cylinder. In: Proceedings of the dislocations 2008 international conference. IOP conference series: materials science and engineering, Dislocations 2008, Hong KongGoogle Scholar
- Wen M, Fukuyama S, Yokogawa K (2007) Cross-slip process in FCC nickel with hydrogen in a stacking fault: an atomistic study using the embedded-atom method. Phys Rev B 75:14410_1–4Google Scholar