Twinning partial multiplication at grain boundary in nanocrystalline fcc metals

Zhu, Y. T.; Wu, X. L.; Liao, X. Z.; Narayan, J.; Mathaudhu, S. N.; Kecskés, L. J.
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p031909
Academic Journal
Most deformation twins in nanocrystalline face-centered cubic (fcc) metals have been observed to form from grain boundaries. The growth of such twins requires the emission of Shockley partials from the grain boundary on successive slip planes. However, it is statistically improbable for a partial to exist on every slip plane. Here we propose a dislocation reaction and cross-slip mechanism on the grain boundary that would supply a partial on every successive slip plane for twin growth. This mechanism can also produce a twin with macrostrain smaller than that caused by a conventional twin.


Related Articles

  • A combined dislocation–cohesive zone model for fracture in nanocrystalline materials. Liu, Yingguang; Zhou, Jianqiu; Shen, Tongde // Journal of Materials Research;2012, Vol. 27 Issue 4, p694 

    A combined dislocation–cohesive zone model was proposed to describe the fracture toughness of nanocrystalline (nc) materials. In the framework of the model, cohesive stress near crack tip initiates edge dislocations, which move to the opposite grain boundaries. The emitted dislocations...

  • Grain Boundary Sliding and Lattice Dislocation Emission in Nanocrystalline Materials under Plastic Deformation. Gutkin, M. Yu.; Ovid'ko, I. A.; Skiba, N. V. // Physics of the Solid State;Sep2005, Vol. 47 Issue 9, p1662 

    A theoretical model is proposed to describe the physical mechanisms of hardening and softening of nanocrystalline materials during superplastic deformation. According to this model, triple interface junctions are obstacles to glide motion of grain boundary dislocations, which are carriers of...

  • Monte Carlo simulation of grain growth in two-phase nanocrystalline materials. Zheng, Y. G.; Lu, C.; Mai, Y.-W.; Gu, Y. X.; Zhang, H. W.; Chen, Z. // Applied Physics Letters;4/3/2006, Vol. 88 Issue 14, p144103 

    The normal grain growth in volume-conserved two-phase nanocrystalline materials is studied using a modified Potts model, in which the grain boundary migration is driven by the interfacial energy between two phases and the grain boundary energy inside each phase. Monte Carlo simulation results...

  • Application of the principle of engineering of grain boundaries for realization of the ultimate (theoretical) strength of nanocrystals. Glezer, A.; Shurygina, N.; Blinova, E.; Firstov, S. // Doklady Physics;Jan2012, Vol. 57 Issue 1, p4 

    The article analysis the level of ultimate (theoretical) strength in the nanocrystalline alloy obtained by controllable annealing of the theoretical state using grain boundaries (GB) engineering. Samples of nanocrystals obtained by vacuum spinning of the melt in the form of strips were...

  • Quasiperiodic grain boundaries and intergranular slip in crystalline and quasinanocrystalline solids. Ovid’ko, I. A. // Physics of the Solid State;Feb97, Vol. 39 Issue 2, p268 

    The interrelationship between the geometrical and plastic characteristics of quasiperiodic grain boundaries in crystals is investigated. The method of density waves is used to obtain a theoretical description of the translational and phason (associated with relative displacements of adjacent...

  • Anisotropic shock response of columnar nanocrystalline Cu. Sheng-Nian Luo; Germann, Timothy C.; Desai, Tapan G.; Tonks, Davis L.; Qi An // Journal of Applied Physics;Jul2010, Vol. 107 Issue 12, p123507 

    We perform molecular dynamics simulations to investigate the shock response of idealized hexagonal columnar nanocrystalline Cu, including plasticity, local shear, and spall damage during dynamic compression, release, and tension. Shock loading (one-dimensional strain) is applied along three...

  • Grain boundary effects on defect production and mechanical properties of irradiated nanocrystalline SiC. Jin, Enze; Niu, Li-Sha; Lin, Enqiang; Song, Xiaoxiong // Journal of Applied Physics;May2012, Vol. 111 Issue 10, p104322 

    Grain boundaries (GBs) are known to play an important role in determining the mechanical and functional properties of nanocrystalline materials. In this study, we used molecular dynamics simulations to investigate the effects of damaged GBs on the mechanical properties of SiC that is irradiated...

  • Growth of deformation twins in room-temperature rolled nanocrystalline nickel. Zhang, X. Y.; Wu, X. L.; Zhu, A. W. // Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p121907 

    Deformation twinning has been observed in room-temperature rolled nanocrystalline Ni. The growth of the deformation twins via the emission of partial dislocations from a grain boundary has been examined in detail. Partial dislocations on neighboring slip planes may migrate for different...

  • Large lattice strain in individual grains of deformed nanocrystalline Ni. Zhiwei Shan; Wiezorek, J. M. K.; Knapp, J. A.; Follstaedt, D. M.; Stach, E. A.; Mao, S. X. // Applied Physics Letters;3/3/2008, Vol. 92 Issue 9, p091917 

    We have used nanobeam electron diffraction to monitor the behavior of individual grains in nanocrystalline Ni during in situ tensile straining in the transmission electron microscope. The diffraction patterns reveal large variations in the magnitude of grain rotation and indicate that grain...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics