Interface-facilitated deformation twinning in copper within submicron Ag–Cu multilayered composites

Wang, Jian; Beyerlein, Irene J.; Mara, Nathan A.; Bhattacharyya, Dhriti

doi:10.1016/j.scriptamat.2011.02.025

Cited by 82 publications

(56 citation statements)

References 23 publications

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“…[59] Studies of the kinetics and energetics underlying particular dislocation/boundary interactions such as slip or twin transmission across boundaries [60][61][62] and slip or twin nucleation from boundaries [59,[63][64][65] are particularly important in developing atomistically informed and, hence, more reliable mesoscale dislocation dynamics approaches; see, for example, References 65 and 66.…”

Section: Discussionmentioning

confidence: 99%

Atomic Structures of $$ [0\bar{1}10] $$ Symmetric Tilt Grain Boundaries in Hexagonal Close-Packed (hcp) Crystals

Wang

Beyerlein

2012

Metall Mater Trans A

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Molecular dynamics simulation and interface defect theory are used to determine the relaxed equilibrium atomic structures of symmetric tilt grain boundaries (STGBs) in hexagonal closepacked (hcp) crystals with a ½0 " 110 tilt axis. STGBs of all possible rotation angles h from 0 deg to 90 deg are found to have an ordered atomic structure. They correspond either to a coherent, defect-free boundary or to a tilt wall containing an array of distinct and discrete intrinsic grain boundary dislocations (GBDs). The STGBs adopt one of six base structures, P ðiÞ B , i = 1, …, 6, and the Burgers vector of the GBDs is related to the interplanar spacing of the base structure on which it lies. The base structures correspond to the basal plane (h = 0 deg, P ð1Þ B ); one of four minimum-energy, coherent boundaries, ð " 2111Þ; ð " 2112Þ; ð " 2114Þ, and ð " 2116Þ P B ). Based on these features, STGBs can be classified into one of six possible structural sets, wherein STGBs belonging to the same set i contain the same base boundary structure P ðiÞ B and an array of GBDs with the same Burgers vector b ðiÞ GB , which vary only in spacing and sign with h. This classification is shown to apply to both Mg and Ti, two metals with different c/a ratios and employing different interatomic potentials in simulation. We use a simple model to forecast the misorientation range of each set for hcp crystals of general c/a ratio, the predictions of which are shown to agree well with the molecular dynamics (MD) simulations for Mg and Ti.

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Section: Discussionmentioning

confidence: 99%

Atomic Structures of $$ [0\bar{1}10] $$ Symmetric Tilt Grain Boundaries in Hexagonal Close-Packed (hcp) Crystals

Wang

Beyerlein

2012

Metall Mater Trans A

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“…Fabrication of nanostructured bulk metals with high interface content has been achieved in many ways [15][16][17][18][19][20][21][22][23] , and in some cases particular interfaces have been created [20][21][22][23] . One important example of a successful application of grain boundary engineering 24 is the fabrication of nanotwinned copper, in which the high-strength microstructure contains nanotwins separated by finely spaced twin boundaries.…”

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confidence: 99%

“…Twins also create a domain of material that has been significantly reoriented. In particular, when deformation twins exceed a critical volume fraction, they can greatly impact material texture, dislocation slip and deformation twin activity, and anisotropy in strength 21,[28][29][30][31] .…”

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confidence: 99%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

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308

156

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Bulk nanostructured metals can attribute both exceptional strength and poor thermal stability to high interfacial content, making it a challenge to utilize them in high-temperature environments. Here we report that a bulk two-phase bimetal nanocomposite synthesised via severe plastic deformation uniquely possesses simultaneous high-strength and high thermal stability. For a bimetal spacing of 10 nm, this composite achieves an order of magnitude increase in hardness of 4.13 GPa over its constituents and maintains it (4.07 GPa), even after annealing at 500°C for 1 h. It owes this extraordinary property to an atomically well-ordered bimaterial interface that results from twin-induced crystal reorientation, persists after extreme strains and prevails over the entire bulk. This discovery proves that interfaces can be designed within bulk nanostructured composites to radically outperform previously prepared bulk nanocrystalline materials, with respect to both mechanical and thermal stability.

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“…The interface plays an important role in LMCs and has been studied in recent years for example in roll bonded composites. In such studies experimental observations have been analyzed also including numerical simulation of evolving interfaces [3][4][5]. It has also been reported that recrystallization and abnormal grain growth can occur in an Al layer after hot deformation and during subsequent annealing [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of interface roughness on the annealing behaviour of laminated Ti-Al composite deformed by hot rolling

Fan

et al. 2015

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

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The preparation of the Ti-Al alloys based on intermetallic phases N Kosova, V Sachkov, I Kurzina et al. -Investigation of physical and mechanical properties of coatings based on intermetallics of the Ti-Al system obtained in acetylene environment from vacuum-arc discharge plasma E L Vardanyan, A Yu Nazarov, K N Ramazanov et al. Abstract. A laminated Ti-Al composite has been fabricated by hot compaction and hot rolling of alternate layers of commercial purity Ti and Al sheets with a thickness of 200 μm. The hot compaction temperature was 500˚C and in a following step the composite has been reduced 50% in thickness by hot rolling. The fully consolidated composite has been annealed at 300˚C and 500˚C for different length of time. As a result of the differences in crystal structure and mechanical properties between Ti and Al protrusions and retrusions formed at the interface. A heterogeneous interface has thereby been created. The heterogeneity affected the recovery kinetics of the aluminium phase which at 300˚C was faster near the interface than in the middle of the Al layer. This effect of a heterogeneous interface is of relevance when optimizing the thermomechanical processing of the composite to obtain high strength and formability for application.

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Interface-facilitated deformation twinning in copper within submicron Ag–Cu multilayered composites

Cited by 82 publications

References 23 publications

Atomic Structures of $$ [0\bar{1}10] $$ Symmetric Tilt Grain Boundaries in Hexagonal Close-Packed (hcp) Crystals

Atomic Structures of $$ [0\bar{1}10] $$ Symmetric Tilt Grain Boundaries in Hexagonal Close-Packed (hcp) Crystals

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Effects of interface roughness on the annealing behaviour of laminated Ti-Al composite deformed by hot rolling

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