Defect Accumulation in Nanoporous Wear-Resistant Coatings Under Collective Recrystallization: Simulation by Hybrid Cellular Automaton Method
- 412 Downloads
A modification of a multiscale hybrid discrete-continual approach of excitable cellular automata is developed. The new version of the method is accomplished by considering the porosity and nanocrystalline structure of a material and the algorithms of calculation of local force moments and angular velocities of microscale rotations. The excitable cellular automata method was used to carry out numerical experiment (NE) for heating of continuous and nanoporous specimens with nanocrystalline TiAlC coatings. The numerical experiments have shown that nanoporosity allows to substantially reduce the rate of collective crystallization. In so doing the nanoporosity slowed down propagation of the heat front in the specimens. This fact can play both positive and negative roles at deposition of the coatings and their further use. On the one hand, by slowing the heat front propagation, one can significantly reduce the level of thermal stresses in deeper layers of the material. On the other hand, such deceleration in case of the high value of the thermal expansion coefficient can give rise to the formation of large gradients of thermal stress, which initiate nucleation and rapid growth of a main crack.
KeywordsExcitable Cellular Automata Force Moment Physical Mesomechanics Body Flux Mechanical Energy Distribution
- 1.Radovic M, Barsoum M. MAX phases: bridging the gap between metals and ceramics. Am Ceram Soc Bull. 2013;92:20–7.Google Scholar
- 2.Levashov E, Merzhanov A, Shtansky D. Advanced technologies, materials and coatings developed in scientific-educational center of SHS. Galvanotechnik. 2009;9:1–13.Google Scholar
- 4.Voevodin AA, Zabinski JS. Nanocomposite and nanostructured tribological materials for space applications. Compos Sci Technol. 2006;65:741–8.Google Scholar
- 12.Panin VE. Physical mesomechanics of heterogeneous media and computer-aided design of materials. Cambridge: Cambridge International Science Publ; 1998.Google Scholar
- 15.Panin VE, Egorushkin VE, Panin AV. Physical Mesomechanics of a deformed solid as a multilevel system. I. Physical fundamentals of the multilevel approach. Phys Mesomech. 2006;9:9–20.Google Scholar
- 16.Egorushkin VE. Dynamics of plastic deformation. Localized inelastic strain waves in solids. In: Physical Mesomechanics of heterogeneous media and computer-aided Design of Materials. Cambridge: Cambridge Interscience Publishing; 1998. p. 41–6.Google Scholar
- 18.Zuev LB, Barannikova SA. Evidence for the existence of localized plastic flow auto-waves generated in deforming metals. Nat Sci. 2010;2:476–83.Google Scholar
- 19.Zuev LB, Danilov VI, Gorbatenko VV. Autowaves of localized plastic deformation. Zhurn Tekh Fiz. 1995;65:91–103.Google Scholar
- 22.Panin AV. Nonlinear waves of localized plastic flow in nanostructured surface layers of solids and thin films. Phys Mesomech. 2005;8:5–15.Google Scholar
- 32.Humphreys FJ, Hatherly M. Recrystallization and related annealing phenomena. New York: Pergamon; 1995.Google Scholar
- 41.Moiseenko DD, Maksimov PV, Panin SV, Panin VE. Defect accumulation in Nanoporous wear-resistant coatings under collective recrystallization. Simulation by hybrid cellular automaton method. In: Papadrakakis M, Papadopoulos V, Stefanou G, Plevris V, editors. Proceedings of VII European congress on computational methods in applied sciences and engineering. Published on-line https://eccomas2016.org/proceedings/pdf/10631.pdf.