Grain Boundary Responses to Heterogeneous Deformation in Tantalum Polycrystals

Bieler, T. R.; Sutton, Scott C.; Dunlap, Bret E.; Keith, Zackery A.; Eisenlohr, Philip; Crimp, M. A.; Boyce, Brad Lee

doi:10.1007/s11837-013-0821-y

Cited by 19 publications

(5 citation statements)

References 17 publications

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“…curvature that can be quantified using the OIM local average misorientation (LAM). 2 In order to examine the relationships between activated slip systems, slip transfer, lattice curvature, and m , a polycrystalline sheet of recrystallized pure Ta [46] with a grain size of about 80 µm and thickness of 1.3 mm was studied. Two samples from the same material were incrementally bent to impose tensile strains in the rolling (RD) and transverse (TD) directions, respectively.…”

Section: Tantalummentioning

confidence: 99%

Grain boundaries and interfaces in slip transfer

Bieler¹,

Eisenlohr²,

Zhang³

et al. 2014

Current Opinion in Solid State and Materials Science

269

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The effect of slip transfer on heterogeneous deformation of polycrystals has been a topic of recurring interest, as this process can either lead to the nucleation of damage, or prevent nucleation of damage. This paper examines recent experimental characterization of slip transfer in tantalum, TiAl, and Ti alloys. The methods used to analyze and assess evidence for the occurrence of slip transfer are discussed. Comparisons between a characterized and simulated patch of microstructure are used to illustrate synergy that leads to new insights that cannot arise with either approach alone. (C) 2014 Published by Elsevier Ltd

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Section: Tantalummentioning

confidence: 99%

Grain boundaries and interfaces in slip transfer

Bieler¹,

Eisenlohr²,

Zhang³

et al. 2014

Current Opinion in Solid State and Materials Science

269

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“…The classic processing-structure-properties-performance materials relationship underscores the need to identify grain boundary structures and their energies. Here we show a large number of grain boundaries energies for tantalum, as a function of tilt axis and misorientation, in order to inform future studies such as those investigating abnormal grain growth [10], heterogeneous deformation of poly and nanocrystals [9,39], and deformation twinning [11]. Specifically, deformation twinning involves the nucleation of Σ3 coherent twin boundaries through the movement of twinning dislocations.…”

mentioning

confidence: 97%

“…The distribution and character of grain boundaries is critical in controlling the strength of metals [8], especially tantalum [9][10][11]. The nature of grain boundaries is inherently complex because their energy is dependent on their character, which depends on five degrees of freedom.…”

mentioning

confidence: 99%

Symmetric tilt boundaries in body-centered cubic tantalum

et al. 2016

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Grain boundaries can play a significant role in the mechanical response of materials. Atomistic simulations are used to investigate 79 coincidence site lattice grain boundary structures and energies in tantalum, a model body-centered cubic transition metal. Quasi-symmetric Σ3, Σ5, Σ7, Σ13, and Σ27 boundaries are observed, of which Σ3 and Σ7 also exist as traditional mirror-symmetry conserving boundary structures. These results are supported by previous observations of similar phenomena in other bcc transition metal Σ5 boundaries. Metastable low energy Σ3 boundary structures in tantalum could influence the formation and stability of deformation twins and abnormal growth grain favoring Σ3 boundaries.

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“…This interface has a mismatch of 16% and has not been previously observed in the similar system ZrO 2 /Nb 16 . In this sense, the presence of (012) cleaving planes in milled Ta grains, could be the origin of such interface orientations 36 . In addition, due to the lamellar shape of Ta particles, it is expected that different ZrO 2 crystallographic orientations form interfaces with the Ta (100) surface, as it occurs in ZrO 2 /Nb composites 16 .…”

Section: Discussionmentioning

confidence: 99%

“…The ability to continue well-dispersed dislocation mobility, even after prolonged fatigue cycling, may be the most important characteristic of the Ta for fatigue resistance. A second reason for their superiority is the larger stress needed to move dislocations 36 . Hence, the yield stress of Ta will always be correspondingly higher which, together with the lower rate of work hardening in these metals, will place the fatigue limit closer to the strength.…”

Section: Discussionmentioning

confidence: 99%

Unprecedented simultaneous enhancement in damage tolerance and fatigue resistance of zirconia/Ta composites

Smirnov

Beltrán

Rodriguez-Suarez

et al. 2017

Sci Rep

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Dense (>98 th%) and homogeneous ceramic/metal composites were obtained by spark plasma sintering (SPS) using ZrO2 and lamellar metallic powders of tantalum or niobium (20 vol.%) as starting materials. The present study has demonstrated the unique and unpredicted simultaneous enhancement in toughness and strength with very high flaw tolerance of zirconia/Ta composites. In addition to their excellent static mechanical properties, these composites also have exceptional resistance to fatigue loading. It has been shown that the major contributions to toughening are the resulting crack bridging and plastic deformation of the metallic particles, together with crack deflection and interfacial debonding, which is compatible with the coexistence in the composite of both, strong and weak ceramic/metal interfaces, in agreement with predictions of ab-initio calculations. Therefore, these materials are promising candidates for designing damage tolerance components for aerospace industry, cutting and drilling tools, biomedical implants, among many others.

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Grain Boundary Responses to Heterogeneous Deformation in Tantalum Polycrystals

Cited by 19 publications

References 17 publications

Grain boundaries and interfaces in slip transfer

Grain boundaries and interfaces in slip transfer

Symmetric tilt boundaries in body-centered cubic tantalum

Unprecedented simultaneous enhancement in damage tolerance and fatigue resistance of zirconia/Ta composites

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