Influence of internal stress coupling on the deformation behavior of NiTi–Nb nanowire composites

Liu, Zhenyang; Cui, Lishan; Liu, Yinong; Jiang, Daqiang; Jiang, Jiang; Shi, Xiaobin; Shao, Yang; Zheng, Yubin

doi:10.1016/j.scriptamat.2014.01.027

Cited by 26 publications

(26 citation statements)

References 24 publications

(24 reference statements)

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“…Under bending, the fiber/matrix interfaces will act as the nucleation sites for the shear bands, for higher stress exists in these regions. [49][50][51] In the present composite with 60 pct fiber volume fraction, when the shear bands encounter the tungsten fiber, they can hardly induce shear deformation of the tungsten fiber ( Figure 5(c)). In the fourth deformation stage in the present experiments, shear bands in the BMG matrix evolve into shear cracks.…”

Section: Initiation and Propagation Of Shear Bandsmentioning

confidence: 79%

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

Chen

Jiang

et al. 2014

Metall Mater Trans A

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The evolution of micro-damage and deformation of each phase in the composite plays a pivotal role in the clarification of deformation mechanism of composite. However, limited model and mechanical experiments were conducted to reveal the evolution of the deformation of the two phases in the tungsten fiber reinforced Zr-based bulk metallic glass composite. In this study, quasi-static compressive tests were performed on this composite. For the first time, the evolution of micro-damage and deformation of the two phases in this composite, i.e., shear banding of the metallic glass matrix and buckling deformation of the tungsten fiber, were investigated systematically by controlling the loading process at different degrees of deformation. It is found that under uniaxial compression, buckling of the tungsten fiber occurs first, while the metallic glass matrix deforms homogeneously. Upon further loading, shear bands initiate from the fiber/ matrix interface and propagate in the metallic glass matrix. Finally, the composite fractures in a mixed mode, with splitting in the tungsten fiber, along with shear fracture in the metallic glass matrix. Through the analysis on the stress state in the composite and resistance to shear banding of the two phases during compressive deformation, the possible deformation mechanism of the composite is unveiled. The deformation map of the composite, which covers from elastic deformation to final fracture, is obtained as well.

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Section: Initiation and Propagation Of Shear Bandsmentioning

confidence: 79%

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

Chen

Jiang

et al. 2014

Metall Mater Trans A

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“…The eutectic alloy is a composite consisting of submicron Nb-rich lamellae within a B2-NiTi-rich matrix, so its mechanical properties are a convolution of those of the two phases, with both precipitation strengthening (blocking dislocations) and composite strengthening (load transfer from matrix to particles, [42]) expected. The microscopic stress and strain coupling between NiTi and Nb-nanowires in tension was recently studied by Liu et al through TEM [28] and X-ray diffraction [29]. While the microstructure in this study is highly textured, as contrasted to our as-cast microstructure, the same NiTi-Nb eutectic composition was used in this study resulting in the same constituent phases.…”

Section: Cyclic Deformationmentioning

confidence: 82%

“…5are the stress-strain curves for an annealed Nb rod [33], an annealed rolled superelastic NiTi plate in tension [7] and superelastic NiTi hot isostatically pressed from prealloyed powders in compression [42], and highly textured NiTi-Nb eutectic nanowires [28]. The Nb stress-strain curve shows a sharp plastic yield stress at 200 MPa, after which it plastically deforms with a low hardening rate.…”

Section: Compressive Properties 3221 Monotonic Deformationmentioning

confidence: 99%

“…5. Stress-strain curve NiTi-Nb eutectic measured here in compression, compared with tension stress-strain curves for B2 NiTi [7], commercial Nb [33], and NiTi-Nb nanowire composite [28], and a compression stress-strain curve for B2 NiTi [42].…”

Section: Compressive Properties 3221 Monotonic Deformationmentioning

confidence: 99%

“…Liu et al theorized in Ref. [28] and then experimentally verified in Ref. [29] that internal stresses develop during cycling due to the mismatch between the elastic recovery of the Nb nanowire and the superelastic recovery of the NiTi matrix.…”

Section: Cyclic Deformationmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and mechanical properties of as-cast quasibinary NiTi–Nb eutectic alloy

Bewerse

Brinson

Dunand

2015

Materials Science and Engineering: A

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a b s t r a c tNi 40 Ti 40 Nb 20 is reported in the literature as a eutectic composition in the quasi-binary NiTi-Nb system. Eutectic and near-eutectic alloys find applications in various fields, including hydrogen permeation, energy damping, and liquid phase bonding of NiTi structures. In this study, we examine a cast Ni-Ti-Nb alloy with the above eutectic composition. Prealloyed, near-stoichiometric NiTi powders and pure Nb powders are blended and heated above the eutectic temperature to create a melt with the eutectic composition. After solidification, the ingot shows some elemental segregation at its top and bottom, but a large middle region exists with a homogeneous eutectic structure. The eutectic has average composition of Ti-40.1Ni-19.6Nb at% and consists of Nb-rich lamellae (Nb-19Ti-10Ni) dispersed within a NiTi-rich matrix (Ti-41Ni-15Nb). Under monotonic compressive deformation, the eutectic alloy yields at 630 MPa, and then shows a linear hardening region, where both plastic and superplastic deformation are active, until a stress of 1080 MPa is reached at an applied strain of 14.7%. On unloading, some superelastic strain is recovered. Upon unloading during compressive load-unload cycling, the eutectic alloy exhibits approximately twice as much superelastic recovery as elastic strain recovery, regardless of the maximum cycle strain.

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Review and perspectives: shape memory alloy composite systems

et al. 2015

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Following their discovery in the early 60's, there has been a continuous quest for ways to take advantage of the extraordinary properties of shape memory alloys (SMAs). These intermetallic alloys can be extremely compliant while retaining the strength of metals and can convert thermal energy to mechanical work. The unique properties of SMAs result from a reversible difussionless solid-to-solid phase transformation from austenite to martensite. The integration of SMAs into composite structures has resulted in many benefits, which include actuation, vibration control, damping, sensing, and selfhealing. However, despite substantial research in this area, a comparable adoption of SMA composites by industry has not yet been realized. This discrepancy between academic research and commercial interest is largely associated with the material complexity that includes strong thermomechanical coupling, large inelastic deformations, and variable thermoelastic properties. Nonetheless, as SMAs are becoming increasingly accepted in engineering applications, a similar trend for SMA composites is expected in aerospace, automotive, and energy conversion and storage related applications. In an effort to aid in this endeavor, a comprehensive overview of advances with regard to SMA composites and devices utilizing them is pursued in this paper. Emphasis is placed on identifying the characteristic responses and properties of these material systems as well as on comparing the various modeling methodologies for describing their response. Furthermore, the paper concludes with a discussion of future research efforts that may have the greatest impact on promoting the development of SMA composites and their implementation in multifunctional structures.

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Influence of internal stress coupling on the deformation behavior of NiTi–Nb nanowire composites

Cited by 26 publications

References 24 publications

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

Direct Observation on the Evolution of Shear Banding and Buckling in Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composite

Microstructure and mechanical properties of as-cast quasibinary NiTi–Nb eutectic alloy

Review and perspectives: shape memory alloy composite systems

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