In situ observation of triple junction motion during recovery of heavily deformed aluminum

Yu, Tianbo; Hughes, D.A.; Hansen, Niels; Huang, Xiaoxu

doi:10.1016/j.actamat.2014.12.014

Cited by 47 publications

(34 citation statements)

References 31 publications

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“…Appearance of the saturated microstructures prevents further refinement and further strengthening of materials upon plastic deformation. Although proper alloying [6][7][8] or twining [9][10][11] can reduce the grain sizes below the saturated size limit, how to break the length scale limit of the deformed microstructure for pure metals is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

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Formation of nano-laminated structure in nickel by means of surface mechanical grinding treatment

2015

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Section: Introductionmentioning

confidence: 99%

“…Grain boundary migration coupled with mobile triple junctions leads to structural coarsening and the removal of defects during deformation as they act as dislocation sinks [10]. It is known that high strain rates and/or low deformation temperatures are effective in reducing grain sizes to some extent [4,11].…”

Section: Introductionmentioning

confidence: 99%

Formation of nano-laminated structure in nickel by means of surface mechanical grinding treatment

2015

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“…4a). As triple junction migration has been proposed as an important recovery mechanism for lamellar structure composed of mainly high angle boundaries [15,16], the presence of high angle boundaries in HMRs should have the chance of forming mobile Y-type tripe junction that is composed of three lamellar boundaries with medium to high misorientation angle [15]. Such triple junction was observed in the boundary sketch of Figure 2b, which is composed of three boundaries that are misoriented by 53.45 o , 15.2 o and 53.6 o , respectively.…”

Section: Hmrsmentioning

confidence: 99%

Influence of structural heterogeneity on the structural coarsening during annealing of polycrystalline Ni subjected to dynamic plastic deformation

Zhang

Luo

Hansen

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The structural heterogeneity of a polycrystalline Ni subjected to dynamic plastic deformation to a strain of 2.3 was characterized, and its influence on the structural coarsening behaviour during post annealing was investigated. Structural heterogeneity on the large scale manifests itself by formation of two types of layers: low misoriented regions (LMRs) and highly misoriented regions (HMRs). On the small scale, the heterogeneity was characterized by different distributions of boundaries and textures in each layer. LMRs contain only low angle boundaries and one dominating crystallographic orientation. In contrast HMRs contain both low and high angle boundaries (>15 o ) and the texture is mixed with <011> close to the compression axis. During annealing, LMRs coarsen uniformly and recrystallization nucleation is difficult to form. In HMRs, the structural evolution is heterogeneous and recrystallization nuclei are readily formed. The importance of structural heterogeneity during structural design for high performance nanostructure was highlighted.

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“…Figure 5a shows no obvious change in the lemallar morphology in both the deformation zone and the matrix region after annealing for 1 hour at 150℃ as compared with the deformed state ( figure 1b). However, quantification of lamellar bounadry sapcings showed that structural coarsenng has taken place by triple junction motion as observed in aluminum of commecial purity [11,12]. Enhanced recovery in the deformatin zone around the large Si particle is seen after annealing for 1 hour at 200℃ , figure 5b-c.…”

Section: Recovery Of the Deformation Zone Around Large Si Particlesmentioning

confidence: 87%

Characterization of Si particles and their effects on and recrystallization in a nanostructured cold rolled Al-1% Si alloy

Huang

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. An Al-1.08 vol.%Si alloy was cold rolled to a reduction of 98% (vM = 4.5) and then annealed at different temperatures up to 210C (0.52 Tm) for different times. The deformed structure is characterized by a nanoscale lamellar structure with the presence of Si particles of coarse (> 1m), medium (100 nm -1 m) and fine (< 100 nm) sizes in the microstructure. Deformation zones are formed around the coarse Si particles and the boundary spacing is finer in the deformation zone than in the matrix. The medium Si particles have little effect on the morphology and boundary spacing. The fine Si particles are aligned along the lamellar boundaries indicating a stabilizing effect on the structural refinement during cold rolling. After annealing, enhanced recovery occurs in the deformation zones around the coarse Si particles. However the reduction in stored energy during recovery and the pinning effect of fine Si particles on the boundary migration prevent the advantage of particle stimulated nucleation (PSN) of coarse Si particles in the nanoscale lamellar structure. This study also demonstrates an important effect of the fine particles in delaying both recovery and recrystallization processes. This effect diminishes with increasing annealing temperature and coarsening the fine particles especially at triple junctions. IntroductionThe effect of second phase particles on the deformation microstructure and recrystallization of Al alloys has been extensively studied in the literature [1][2][3][4][5][6][7]. It is generally observed that the recrystallization kinetics in alloys containing large particles (typically with sizes > 1 m) is accelerated while that in alloys containing fine particles is retarded. In the case of containing both coarse and fine particles, the overall kinetics of recrystallization could be retarded or accelerated depending on the relative strength of the effects from the two types of particles [3].In a recent study [8], a nanostructured Al-1%Si (or Al-1.08% vol.%Si) alloy with an ultrahigh purity Al matrix (99.9996%) was produced by heavy cold rolling to 98% thickness reduction (vM = 4.5). The nanostructured Al-1%Si alloy is characterized by a lamellar structure with an average lamellar boundary spacing of 230 nm, a fine dispersion of nanosized Si particles and a certain amount of large Si particles [8]. The Si particles of different sizes are expected to affect the structural and textural evolution during deformation and annealing of the nanostructured alloy. In this study, this effect has been analyzed separately for coarse and fine particles including their combined effect.

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In situ observation of triple junction motion during recovery of heavily deformed aluminum

Cited by 47 publications

References 31 publications

Formation of nano-laminated structure in nickel by means of surface mechanical grinding treatment

Formation of nano-laminated structure in nickel by means of surface mechanical grinding treatment

Influence of structural heterogeneity on the structural coarsening during annealing of polycrystalline Ni subjected to dynamic plastic deformation

Characterization of Si particles and their effects on and recrystallization in a nanostructured cold rolled Al-1% Si alloy

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