Temperature-dependent strain localization and texture evolution of highly nanotwinned Cu

Furnish, Timothy Allen; Lohmiller, Jochen; Gruber, Patric A.; Barbee, Troy W.; Hodge, Andrea M.

doi:10.1063/1.4812975

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…The inclusion of TBs in the film microstructure for low-intermediate SFE metals has shown a direct impact on the properties of the material, where the mechanical, thermal, and chemical properties are enhanced [1][2][3][4][5][6][7][8]. These improved properties have increased the working space of nanotwinned (nt) metals and contribute to the development of fundamental research for material's behavior at the nanoscale, particularly in low SFE metals with high TBs density [2,5,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

Velasco

Hodge

2017

Materials Science and Engineering: A

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This work explores the formation of twin boundaries in high stacking fault energy metals (SFE > 125 mJ/m 2 ) by synthesizing thick films (> 10 μm) of Al, Al-5.3wt.%Mg, and Ni using magnetron sputtering. We report the observation of twin boundaries that are inclined with respect to the film growth direction across the entire thickness of the films. The formation of these inclined twin boundaries results in localized changes in the texture of the columnar grains.Microstructural analysis revealed that the fraction of twinned grains in the Al film (46%) is four times higher compared to other similar studies in Al, while the Al-5.3wt.%Mg and Ni films can be considered highly twinned since the fraction of twinned grains is 70% and 90%, respectively.The experimental observations provide an explanation on the formation of twin boundaries during the synthesis of the films, and emphasize that, in addition to stacking fault energy restrictions, high grain boundary mobility is a limiting factor on the nucleation of twin boundaries.

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Section: Introductionmentioning

confidence: 99%

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

Velasco

Hodge

2017

Materials Science and Engineering: A

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“…The potential of nt materials has been highlighted in the mechanical testing of nanotwinned Cu, which showed high strength and good ductility compared to UFG or coarse grain Cu [4,6,7]. Additionally, nt materials have shown good corrosion resistance, thermal stability, and tolerance to radiation damage [8][9][10]. To date, nt materials have been synthesized using different metals and alloys systems, such as Cu, Ag, Cu-Al, Cu-Zn, and stainless steel among others [4,6,7,[11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The mobility of growth twins synthesized by sputtering: Tailoring the twin thickness

Velasco

Hodge

2016

Acta Materialia

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The current work presents a protean twin thickness contour zone map that illustrates how the nucleation and the mobility of twin boundaries affects the twin thickness of sputtered films. The twin thickness contour zone map can be used as a versatile guide to synthesize fully nanotwinned films with tailored twin thicknesses in materials with a wide range of stacking fault energies. The nucleation and mobility of twin boundaries was studied in four Cu alloys of different compositions (Cu-6wt.%Al, Cu-4wt.%Al, Cu-2wt.%Al, and Cu-10wt%Ni), having stacking fault energies ranging from 6 mJ/m 2 to 60 mJ/m 2 . The films were synthesized by magnetron sputtering and characterized by transmission electron microscopy, where the twin thickness varied from 2 nm to 35 nm. Our experimental results show that it is possible to control the twin thickness.Three main mechanisms are explained to describe twin nucleation and twin boundary mobility, which are correlated to the interplay of specific sputtering conditions and the deposition temperature.

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“…Singh et al [15] showed that coherent NTs in the UFG Cu led to a noticeable improvement in damage tolerance. Furnish et al [16] observed plastic strain and texture development in NT Cu foils in tension and found two distinct deformation regions relative to fracture surface. These experimental observations have greatly contributed to our current understanding, but experimental investigation alone is not sufficient to provide a complete picture of the underlying mechanisms that control the overall strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

Computer simulation of strength and ductility of nanotwin-strengthened coarse-grained metals

Guo

Weng

et al. 2014

Modelling Simul. Mater. Sci. Eng.

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The superior strength-ductility combination in nanotwin (NT)-strengthened metals has provided a new potential for optimizing the mechanical properties of coarse-grained (CG) metals. In this paper computer simulations based on the mechanism-based strain gradient plasticity and the Johnson–Cook failure criterion have been carried out to uncover the critical factors that serve to provide this dual function. Our results indicate that both the distribution characteristics of the NT regions and the constitutive relations of the NT phase can have a significant impact on the strength and ductility of the CG Cu strengthened by the NT regions. In particular, twin spacing, distribution characteristics such as arrangement, shape and orientation, together with volume fraction of the NT regions, can all have significant effects. Along the way, we also discovered that microcrack initiation, coalescence and deflection constituted the entire failure process. Significant insights into the morphology of NT regions that could deliver superior strength and ductility combination for CG metals have been established.

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Temperature-dependent strain localization and texture evolution of highly nanotwinned Cu

Cited by 4 publications

References 30 publications

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

The mobility of growth twins synthesized by sputtering: Tailoring the twin thickness

Computer simulation of strength and ductility of nanotwin-strengthened coarse-grained metals

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