A new criterion for elasto-plastic transition in nanomaterials: Application to size and composite effects on Cu–Nb nanocomposite wires

Thilly, L.; Petegem, S. Van; Renault, P.-O.; Lecouturier, Florence; Vidal, Vanessa; Schmitt, B.; Swygenhoven, H. Van

doi:10.1016/j.actamat.2009.03.021

Cited by 98 publications

(94 citation statements)

References 25 publications

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“…Such a transient was widely observed before [48e51], indicative of the Bauschinger effect (BE). It usually appears for alloys of multi-phases with varying yield stresses, over a strain regime corresponding to heterogeneous elasto-plastic deformation [36,38]. Similar behavior of Q has also been observed recently in gradient structure [52,53] and heterogeneous lamella structure [41].…”

Section: Tensile Propertiesmentioning

confidence: 57%

“…The most common explanation for the hysteresis loops in interrupted tensile tests is based on the back stresses resulting from inhomogeneous plastic deformation [36,38,54,55]. Here, the macroscopic stress is separated into the internal stress (s back ) and effective stress (s eff ) [56].…”

Section: Strain Hardening Due To Back Stressesmentioning

confidence: 99%

“…Recently, the use of diffraction techniques has supplanted this macroscopic description of internal stresses by the measurements of lattice strains in individual phases [45,46]. The unload-reload tests [36,38,47] are also used for the study of internal stresses in thin films or composite wires where compression cannot be applied.…”

Section: Introductionmentioning

confidence: 99%

“…The load redistribution and strain partitioning resulting from the microstructural heterogeneity enable a high capacity of strain hardening, affecting the large ductility. The high internal stresses have in fact been reported to contribute to strain hardening and large ductility in TRIP steels [32], TWIP steels [33e35], nano-composites [36,37], and dual-phase alloys [38,39].…”

Section: Introductionmentioning

confidence: 99%

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Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

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Section: Tensile Propertiesmentioning

confidence: 57%

Section: Strain Hardening Due To Back Stressesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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“…6(c)), the relative peak intensities of (100) and (111) increased whereas those of (1 11), (020), (011) and (001) decreased. In the transverse 32 , olive circle 33 , dark cyan downtriangle 17 , magenta lefttri 34 , dark yellow righttri 16 , navy diamond 35 , wine pentagon 18 , pink circle 36,37 ]. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)…”

Section: Deformation Of the Soft Tini Componentmentioning

confidence: 99%

In situ synchrotron high-energy X-ray diffraction study of microscopic deformation behavior of a hard-soft dual phase composite containing phase transforming matrix

et al. 2017

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a b s t r a c tThis study explored a novel intermetallic composite design concept based on the principle of lattice strain matching enabled by the collective atomic load transfer. It investigated the hard-soft microscopic deformation behavior of a Ti 3 Sn/TiNi eutectic hard-soft dual phase composite by means of in situ synchrotron high-energy X-ray diffraction (HE-XRD) during compression. The composite provides a unique micromechanical system with distinctive deformation behaviors and mechanisms from the two components, with the soft TiNi matrix deforming in full compliance via martensite variant reorientation and the hard Ti 3 Sn lamellae deforming predominantly by rigid body rotation, producing a crystallographic texture for the TiNi matrix and a preferred alignment for the Ti 3 Sn lamellae. HE-XRD reveals continued martensite variant reorientation during plastic deformation well beyond the stress plateau of TiNi. The hard and brittle Ti 3 Sn is also found to produce an exceptionally large elastic strain of 1.95% in the composite. This is attributed to the effect of lattice strain matching between the transformation lattice distortion of the TiNi matrix and the elastic strain of Ti 3 Sn lamellae. With such unique micromechanic characteristics, the composite exhibits high strength and large ductility.

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Cu–Nb Nanocomposite Wires Processed by Severe Plastic Deformation: Effects of the Multi‐Scale Microstructure and Internal Stresses on Elastic‐Plastic Properties

et al. 2012

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Several recent studies have shed light on the effect of microstructure architecture onto the macroscopic mechanical properties of materials and the possibility to use a new degree of freedom in the tailoring of multi-functional properties of structure materials: the ordering of microstructure at the mesoscale. [1,2] If this concept is extensively present in natural materials such as wood or shells, where multi-modal or multi-scale architecture can be found, it is rather recently that it is consciously applied to design modern engineering materials. [1] For example, this is the case in the steel industry where complex multi-phased microstructures are produced to provide multi-functionality such as high elastic limit for prolonged lifetime and ductility for improved formability. Similarly, nanocomposite metals are seen as strong candidates for several applications in extreme environment (high dose irradiation, severe deformation, shock, high magnetic field, high temperature, etc.) because the combination of refined microstructure, inter-phase boundaries and hierarchy provides unique macroscopic properties, not available in standard materials. [3] However, the main challenge still remains in the full understanding of the complex interaction existing between materials properties and their architecture, in particular when size effects affect the elementary physical mechanisms. In this field, combined experimental and simulation efforts are mandatory.From the experimental point of view, the full knowledge of the microstructure is necessary, from atomic to macroscopic scales; this can be obtained by a combination of standard and advanced characterization techniques. Similarly, to characterize the impact of architecture on macroscopic mechanical properties, specific testing techniques must be developed: in this field, the combination of deformation and diffraction appears to be particularly well suited. Thanks to the high penetration depth of thermal neutrons or high energy X-rays (at synchrotrons) and the crystallographic selectivity of diffraction, in-situ deformation tests under neutrons or X-rays can indeed bring deep insight into the role of internal stresses and reveal the phase-specific deformation behavior and strengthening mechanisms of complex materials. In the present article, the results obtained in the case of Cu-Nb COMMUNICATION[*] Dr.

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A new criterion for elasto-plastic transition in nanomaterials: Application to size and composite effects on Cu–Nb nanocomposite wires

Cited by 98 publications

References 25 publications

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

In situ synchrotron high-energy X-ray diffraction study of microscopic deformation behavior of a hard-soft dual phase composite containing phase transforming matrix

Cu–Nb Nanocomposite Wires Processed by Severe Plastic Deformation: Effects of the Multi‐Scale Microstructure and Internal Stresses on Elastic‐Plastic Properties

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