Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals

Chen, Yu‐Chen; Molnárová, Orsolya; Tyc, Ondřej; Kadeřávek, Lukáš; Heller, Luděk; Šittner, Petr

doi:10.1016/j.actamat.2019.09.012

Cited by 107 publications

(39 citation statements)

References 52 publications

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“…Qi et al pioneered the printed active composite materials [ 9,10 ] shifting into an intricate configuration directly by heating. Another important strategy is to use shape memory materials (SMM), [ 11 − 14 ] mainly including shape memory polymers (SMPs) [ 15 − 19 ] and shape memory alloys (SMAs) [ 20,21 ] in AM. As‐prepared products can change from their temporary structures to the initial configurations when exposed to a high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

A Material Combination Concept to Realize 4D Printed Products with Newly Emerging Property/Functionality

Zhang

et al. 2020

Advanced Science

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4D printing is a newly emerging technique that shows the capability of additively manufacturing structures whose shape, property, or functionality can controllably vary with time under external stimuli. However, most of the existing 4D printed products only focus on the variation of physical geometries, regardless of controllable changes of their properties, as well as practical functionality. Here, a material combination concept is proposed to construct 4D printed devices whose property and functionality can controllably vary. The 4D printed devices consist of conductive and magnetic parts, enabling the integrated devices to show a piezoelectric property even neither part is piezoelectric individually. Consequently, the functionality of the devices is endowed to transfer mechanical to electrical energy based on the electromagnetic introduction principle. The working mechanism of 4D printed devices is explained by a numerical simulation method using Comsol software, facilitating further optimization of their properties by regulating diverse parameters. Due to the self‐powered, quick‐responding, and sensitive properties, the 4D printed magnetoelectric device could work as pressure sensors to warn illegal invasion. This work opens a new manufacturing method of flexible magnetoelectric devices and provides a new material combination concept for the property‐changed and functionality‐changed 4D printing.

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Section: Introductionmentioning

confidence: 99%

A Material Combination Concept to Realize 4D Printed Products with Newly Emerging Property/Functionality

Zhang

et al. 2020

Advanced Science

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“…It was already mentioned that deformation twinning in oriented B19 0 martensite was found to be responsible for the onset of plastic deformation of NiTi wires at low temperatures [21]. Deformation twinning in the B19 0 martensite [13,15] differs from the conventional transformation twinning in martensite [24], particularly in that the deformation twins do not transform back to the original parent austenite phase on unloading and heating.…”

Section: Mechanisms Of the Stress Induced B2 ) B19 0 ) B2 T Martensitic Transformationmentioning

confidence: 99%

“…Maximum upper plateau strain 16% was observed in tensile test at 90°C. Since we knew from the closely related work [21] that plastic deformation of the stress induced martensite proceeds via deformation twinning in martensite, we suspected that the B19 0 martensite newly appearing when the austenite transforms within the propagating martensite band front may deform further via deformation twinning-i.e. that the deformation twinning in B19 0 martensite takes place already during the forward loading till the end of the stress plateau [6].…”

Section: Localized Tensile Deformation Of Superelastic Niti Wire At Various Temperaturesmentioning

confidence: 99%

“…In this orientation, the deformation bands, which contain austenite twins or B19 0 martensite are oriented to the electron beam so that they diffract strongly and remain dark. The B19 0 martensite within the deformation band is oriented with \ 010 [ axis along the electron beam due to the B2/B19 0 lattice correspondence and martensite variant selection in this orientation [21,23]. If we needed to visualize the austenite twins or B19 0 martensite, we just took DF image using diffraction spot corresponding to one of these microstructure constituents.…”

Section: Microstructure Of Wires Deformed At Elevated Temperaturesmentioning

confidence: 99%

“…The PTG scheme allows for prediction of deformation twinning systems in the B19 0 martensite [17] bringing about unrecoverable strains claimed by Gao et al to be associated with functional fatigue [18] and cousing grain refinement [19] of NiTi transforming cyclically under high stress. Chen et al [6,20,21] carried out a systematic investigation of tensile deformation of NiTi wires having a range of microstructures in wide temperature range. Based on the results of the observations of {114} austenite twins in microstructures of deformed wires and synchrotron x-ray experiments informing the evolution of phase volume fractions upon loading, they claimed that the deformation twinning in oriented martensite plays an instrumental role in superelastic deformation at elevated temperatures [6] and plastic deformation of NiTi wires from -100 to 200°C.…”

Section: Introductionmentioning

confidence: 99%

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B2 ⇒ B19′ ⇒ B2T Martensitic Transformation as a Mechanism of Plastic Deformation of NiTi

Šittner

Heller

Sedlák

et al. 2019

Shap. Mem. Superelasticity

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Deformation of superelastic NiTi wire with tailored microstructure was investigated in tensile loadingunloading tests up to the end of the stress plateau in wide temperature range from room temperature up to 200°C. Lattice defects left in the microstructure of deformed wires were investigated by transmission electron microscopy. Tensile deformation is localized up to the highest test temperatures, even if practically no martensite phase exists in the wire at the end of the stress plateau. In tensile tests at elevated temperatures around 100°C, at which the upper plateau stress approaches the yield stress for plastic deformation of martensite, upper plateau strains become unusually long, transformation strains become unrecoverable and deformation bands containing {114} austenite twins appear in the microstructure of deformed wires. These observations were rationalized by assuming activity of B2 ) B19 0 ) B2 T martensitic transformation into the austenite twins representing a new mechanism of plastic deformation of NiTi, additional to the dislocation slip in austenite and/or martensite. It is claimed that this transformation becomes activated in any thermomechanical load in which the oriented B19 0 martensite is exposed to high stress at high temperatures, as e.g., during shape setting or actuator cycling at high applied stress.Keywords Materials Á Stress-induced martensitic transformation Á Superelasticity Á Twinning This article is an invited submission to Shape Memory and Superelasticity selected from presentations at the Shape Memory and Superelastic Technology Conference and Exposition (SMST2019) held May 13-17, 2019 at The Bodensee Forum in Konstanz, Germany, and has been expanded from the original presentation.

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In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTi

et al. 2021

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Recoverability of large strains and deformation twinning in martensite during tensile deformation of NiTi shape memory alloy polycrystals

Cited by 107 publications

References 52 publications

A Material Combination Concept to Realize 4D Printed Products with Newly Emerging Property/Functionality

A Material Combination Concept to Realize 4D Printed Products with Newly Emerging Property/Functionality

B2 ⇒ B19′ ⇒ B2T Martensitic Transformation as a Mechanism of Plastic Deformation of NiTi

In Situ Synchrotron X‐Ray Diffraction during High‐Pressure Torsion Deformation of Ni and NiTi

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