Athermal grain growth through cooperative migration of grain boundaries in deformed nanomaterials

Gutkin, M. Yu.; Mikaelyan, K. N.; Ovid’ko, I. A.

doi:10.1016/j.scriptamat.2008.01.002

Cited by 26 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As noted in the introduction, recent work does point out various material processes that do not conform to Arrhenius, or thermally activated, temperature dependence [42]. Athermal GB migration has also been reported in experiments [3,43,44]. Nevertheless, the thermally damped migration mechanism deserves further attention.…”

Section: Thermally Damped Migration Mechanismmentioning

confidence: 97%

The role of crystallography and the mechanisms associated with migration of incoherent twin grain boundaries

2017

View full text Add to dashboard Cite

With twin grain boundaries playing an important role in numerous materials, it is important to understand their behavior across the full range of possible boundary plane orientations. This work examines the migration of 41 computed ∑3 nickel grain boundaries over a range of temperatures. The boundary plane orientation appears to play the determining role in the nature of the migration observed, which is evident when the data are plotted in the fundamental zone of possible boundary plane orientations. GBs whose boundary plane lie between and exhibit thermally activated migration and the atoms do not move in a coordinated fashion. The remaining GBs, including the GB, exhibit some form of thermally damped migration. The thermally damped migration is characterized by inverse temperature dependence where the GBs migrate faster at lower temperatures and move in a coordinated fashion involving Shockley partial dislocations. The inverse temperature dependence, which is confirmed by random walk simulations, appears to be consistent with dislocation drag, which could be related to the Shockley partial dislocations. At least one GB exhibits mixed mobility trends due to the presence of both thermally activated and thermally damped migration characteristics.

show abstract

Section: Thermally Damped Migration Mechanismmentioning

confidence: 97%

The role of crystallography and the mechanisms associated with migration of incoherent twin grain boundaries

2017

View full text Add to dashboard Cite

show abstract

“…Recently, rapidly growing attention has been paid to the stress-driven migration of GBs in nanocrystalline materials, which represents both a toughening micromechanism [40] and a specific deformation mode [19,38,[41][42][43][44][45][46]. This twofold role of the stress-driven migration of GBs is indirectly supported by experimental observations [47,48] of the athermal grain growth in the vicinities of cracks in nanocrystalline materials.…”

Section: Introductionmentioning

confidence: 90%

“…In particular, recently, several specific deformation mechanisms have been assumed to be responsible for the toughness enhancement in nanocrystalline solids. These include Ashby-Verall creep (carried by intergrain sliding accommodated by grain boundary (GB) diffusion and grain rotations) [7], nanoscale deformation twinning [38], rotational deformation [39] and stress-driven migration of GBs [40].…”

Section: Introductionmentioning

confidence: 99%

Effect of cooperative grain boundary sliding and migration on crack growth in nanocrystalline solids

2011

Self Cite

View full text Add to dashboard Cite

“…Grain growth in NC materials can be due to the rotation and coalescence of adjacent grains, as well as normal grain boundary movements. There are several theoretical models that have been proposed to describe the mechanically driven grain growth behavior, for example, stresscoupled GB migration [51][52][53][54][55][56] and grain rotation-induced grain coalescence [57].…”

Section: Grain Boundary Migration-theoretical Modelmentioning

confidence: 99%

“…The stress-coupled GB migration model is based on the argument that shear stress causes tangential movement of grains along GBs (GB sliding), and this produces a coupling with the normal motion of GBs (GB migration) [51]. Gutkin and Ovid'ko proposed a continuum disclination model for describing the stress-induced cooperative migration of an arbitrary tile GB [53][54][55]. The migrating GB was approximated by partial wedge disclination that can move under the applied shear stress, as shown in Figure 6.…”

Section: Grain Boundary Migration-theoretical Modelmentioning

confidence: 99%

Grain Boundary Effects on Microstructural Stability of Nanocrystalline Metallic Materials

Zhu¹,

Zhang²,

Chen³

2017

Study of Grain Boundary Character

View full text Add to dashboard Cite

Grain boundaries play an important role in dictating the mechanical and physical properties of nanocrystalline (NC) materials because of the increased volume fraction of intercrystalline components as the grain size decreases. In general, grain boundaries have a high energy level and there exists a thermodynamic driving force to reduce the overall area of grain boundaries through grain coarsening, making NC material systems intrinsically unstable. Recent investigations also indicate that mechanical deformation can promote grain growth in NC material even at the cryogenic temperatures. In this chapter, first, the current investigation on the grain boundary structures of NC metallic materials is briefly reviewed and then the state-of-the-art of experimental results on the microstructural stability during deformation processes is discussed. Finally, several key issues for improving the microstructure stability of NC metallic materials and possible future work are discussed.

show abstract

Athermal grain growth through cooperative migration of grain boundaries in deformed nanomaterials

Cited by 26 publications

References 34 publications

The role of crystallography and the mechanisms associated with migration of incoherent twin grain boundaries

The role of crystallography and the mechanisms associated with migration of incoherent twin grain boundaries

Effect of cooperative grain boundary sliding and migration on crack growth in nanocrystalline solids

Grain Boundary Effects on Microstructural Stability of Nanocrystalline Metallic Materials

Contact Info

Product

Resources

About