Multi-axial behavior of shape-memory alloys undergoing martensitic reorientation and detwinning

Pan, Houwen Matthew; Thamburaja, T Prakash G.; Chau, Fook Siong

doi:10.1016/j.ijplas.2006.08.002

Cited by 61 publications

(32 citation statements)

References 25 publications

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“…Currently, quantitative information about such coupling is lacking. Inelastic deformation processes in martensite, such as detwinning and reorientation, can be addressed as described by Pan et al [26]. In principle, martensite plasticity can also be incorporated, but detailed experimental evidence of operative slip systems and critical stresses for activation is lacking.…”

Section: Discussionmentioning

confidence: 99%

“…This study models N T = 24 type-II twinned martensite plate types, like many micromechanics-based models [13,[15][16][17]26], although there are 192 theoretically possible habit plane variants (hpv) for B2 ! B19 0 transformation [47].…”

Section: Transformation P Trans = {H T K T F C and H Tu }mentioning

confidence: 99%

“…Most do not incorporate it at all [12][13][14][15][16], including the aforementioned recursive model [21,22]. Some recent efforts have included martensite plasticity, either in J2-based [18,26] or crystal-based [17] forms. However, austenite rather than martensite plasticity has been observed in recent transmission electron microscope studies of pseudoelastically deformed, solutionized 50.7 at.% Ni-Ti single crystal pillars [27] and cold-worked 50.8 at.% Ni-Ti wires [28], as well as thermally cycled, singlecrystal 50.4 at.% Ni-Ti [29].…”

Section: Introductionmentioning

confidence: 99%

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Thermal cycling and isothermal deformation response of polycrystalline NiTi: Simulations vs. experiment

et al. 2011

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A recent microstructure-based FEM model that couples crystal-based plasticity, the B2 M B19 0 phase transformation and anisotropic elasticity at the grain scale is calibrated to recent data for polycrystalline NiTi (49.9 at.% Ni). Inputs include anisotropic elastic properties, texture and differential scanning calorimetry data, as well as a subset of recent isothermal deformation and load-biased thermal cycling data. The model is assessed against additional experimental data. Several experimental trends are captured -in particular, the transformation strain during thermal cycling monotonically increases and reaches a peak with increasing bias stress. This is achieved, in part, by modifying the martensite hardening matrix proposed by Patoor et al. [Patoor E, Eberhardt A, Berveiller M. J Phys IV 1996;6:277]. Some experimental trends are underestimated -in particular, the ratcheting of macrostrain during thermal cycling. This may reflect a model limitation that transformation-plasticity coupling is captured on a coarse (grain) scale but not on a fine (martensitic plate) scale.

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Section: Discussionmentioning

confidence: 99%

Section: Transformation P Trans = {H T K T F C and H Tu }mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal cycling and isothermal deformation response of polycrystalline NiTi: Simulations vs. experiment

et al. 2011

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“…The modeling of the multi-axial behavior of shape-memory alloys by a finite-element implementation can be found in [14] where a model introduced in [17] is used.…”

Section: Introductionmentioning

confidence: 99%

On the numerical simulation of material inhomogeneities due to martensitic phase transformations in poly-crystals

Junker

Hackl

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract.Experimental results show that martensitic phase transformations in shape-memory alloys occur in localized zones. Based on a micromechanical model we want to simulate these effects. The mathematical treatment is accompanied by a finite-element calculation which includes, due to the model modification, a regularization. The result of this effort is a micromechanically well motivated algorithm which shows qualitatively a good agreement with experiments. Numerical examples are presented.

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“…[15,16,19,22,23] A ternary alloy has recently been studied by indentation of thin film specimens. [24] In contrast, less attention was paid to the characterization of bulk ternary alloys, even though these alloys exhibit optimized phase transformation behavior, a smaller thermal hysteresis, and are less prone to functional fatigue.…”

mentioning

confidence: 99%

Nanoindentation of a Pseudoelastic NiTiFe Shape Memory Alloy

et al. 2010

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NiTi-based shape memory alloys (SMA) are successfully used in various applications such as guide wires, stents, or actuator devices. [1][2][3][4][5][6][7][8] NiTi SMA can recover large strains (up to 8%) by virtue of a reversible phase transformation between an austenitic and a martensitic phase. Most medical applications make use of the mechanical shape memory (pseudoelasticity), which involves the stress-induced formation of martensite and the reverse transformation during subsequent unloading. As NiTi SMA often find applications in small and miniaturized medical devices, mechanical testing of small volumes and analyzing the local transformation behavior is important. [9][10][11][12] Instrumented nanoindentation is a suitable tool for characterizing small volumes of SMA because of the technique is focused on low loads and small displacements. Nanoindentation allows the determination of local mechanical properties. [13][14][15][16] Loads and displacements are recorded continuously. From the recorded load-displacement curves, the elastic and plastic material behavior can be characterized, and related material parameters can be quantified. [17] To compare nanoindentation results obtained with various experimental settings, and to quantify shape memory and pseudoelastic recovery of different SMA specimens, it is useful to study the characteristic ratio of remnant indentation depth (D rem ) and maximum indentation depth (D max ). [18][19][20][21] This so-called remnant depth ratio (RDR) is defined asRDR-values near zero (RDR 10%) are expected for perfect pseudoelastic recovery.Nanoindentation can be performed with different indenter tips, for example, pyramidal tips or spherical tips, and the corresponding stress and strain states below these indenter tips are quite different. [17] As shape memory and pseudoelastic phase transformations can only accommodate strains up to 6-8%, it has to be clarified which tip geometries are suitable for investigating pseudoelastic recovery. Most previousNanoindentation is a suitable tool for characterizing the local mechanical properties of shape memory alloys (SMA) and to study their pseudoelastic behavior. There is a special interest in indenting with different indenter tips (as not all tips are associated with strain states that predominantly induce the martensitic transformation) and in indenting at different temperatures, where different phases are present. In this study, we perform nanoindentation on a ternary NiTiFe SMA with different indenter tips and at various testing temperatures. For nanoindentation with spherical tips, load-displacement hystereses clearly indicate pseudoelastic behavior, whereas indentation with Berkovich tips results in more pronounced plastic deformation. Testing at different temperatures is associated with different volume fractions of austenite, martensite, and R-phase. The corresponding nanoindentation responses differ considerably in terms of pseudoelastic behavior. Best pseudoelastic recovery is found at testing temperatures close to the R-phase ...

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Multi-axial behavior of shape-memory alloys undergoing martensitic reorientation and detwinning

Cited by 61 publications

References 25 publications

Thermal cycling and isothermal deformation response of polycrystalline NiTi: Simulations vs. experiment

Thermal cycling and isothermal deformation response of polycrystalline NiTi: Simulations vs. experiment

On the numerical simulation of material inhomogeneities due to martensitic phase transformations in poly-crystals

Nanoindentation of a Pseudoelastic NiTiFe Shape Memory Alloy

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