Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires

Chen, Ying; Zhang, Xuexi; Dunand, David C.; Schuh, Christopher A.

doi:10.1063/1.3257372

Cited by 74 publications

(51 citation statements)

References 21 publications

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“…One should note that the curves have irregular shapes, however; the same shapes were evident in all companion experiments, eliminating the possibility of scatter in data. Indeed, these observations agree well with the previous findings of work on CuAlNi pillars 22,23) and wires, 24) and NiTi micro wires. 25) Specifically, consecutive compressive loading of the CuAlNi pillars and wires led to the narrowing of hysteresis.…”

Section: Resultssupporting

confidence: 83%

Micro-Scale Cyclic Bending Response of NiTi Shape Memory Alloy

et al. 2016

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Section: Resultssupporting

confidence: 83%

Micro-Scale Cyclic Bending Response of NiTi Shape Memory Alloy

et al. 2016

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“…The panels in Fig. 2 focus on a single grain with a large aspect ratio of 4, bounded by grain boundaries on either side (marked by dashed red lines in the upper left panel); this is a typical oligocrystalline structure [14,54]. The left column of Fig.…”

Section: Martensite Morphology In Fine and Coarser Wiresmentioning

confidence: 99%

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Ueland

Schuh

2013

Acta Materialia

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“…[ 32 ] We use electron back scattering diffraction to confi rm the formation of crystals spanning the entire cross section of the wires in a bamboo-shaped grain structure ( Figures S3 and S4 of the Supporting Information). [ 24,33,34 ] Notably, these measurements are made on the wires as drawn (without any subsequent thermal annealing).…”

Section: Doi: 101002/aelm201600003mentioning

confidence: 99%

Highly Stretchable Conductors Made by Laser Draw‐Casting of Ultralong Metal Nanowires

Han

Shi

Bahl

et al. 2016

Adv Elect Materials

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precisely defi ne continuous conductive lines with deterministic curvatures as shown by Rogers and co-workers, [7][8][9] leading to minimization of local strains with respect to the macroscale conductor deformation. These fl exible electrical devices can reach strains of ≈100%, but involve a series of complex fabrication steps including photolithography, e-beam or sputtering deposition, and lift-off.The performance of stretchable conductor fi lms also depends on the structural quality of the conductive elements. For example, while CNTs are theoretically as conductive as metal fi lms and wires, they have demonstrated only moderate specifi c conductivity due to short lengths and large defect density caused during synthesis, purifi cation, and functionalization. Metallic thin fi lms and nanowires made by vacuum physical vapor deposition, such as electron beam evaporation or sputtering, intrinsically offer higher electrical performance in stretchable and foldable electronics. However, their implementation is limited by the cost of vacuum processing for large area applications, and their poor mechanical properties due to the ultrafi ne-grain structure which make them brittle and prone to fracture and cracks. Solution-synthesized silver and gold nanowires [ 10,11 ] are also attractive for percolation networks. However, short (1-20 µm) nanowires [ 12 ] suffer from local contact losses and hysterisis at large strains. Recently, a hybrid multiscale design incorporating microscale diameter and centimeter-long metal wires has been used with nanoscale percolation networks to enhance the conductive performance under strain. [13][14][15][16] In this work, we report a new route to fabricate long metal micro-and nanowires by a novel laser-assisted draw-casting process, and demonstrate their integration in highly stretchable conductors reaching 700% strain while maintaining almost invariant electrical conductivity. Using this new process, Pd wires with submicron diameters and centimeter length are individually drawn at speeds close to 0.4 m s −1 . In particular, these wires represent a new route to the fabrication of high performace and reliable stretchable conductors which overcome the limitations associated with thin fi lms or percolation networks. The throughput of the wire manufacturing is scalable. While the drawing speed is limited by our current actuators, we expect that this approach can be implemented in a high throughput manufacturing setting, where bundles of wires can be drawn in parallel at speeds of several meters per second. We demonstrate a simple route to laminate the wires on fl exible substrate and measure their strain-dependent electrical conductivity. We show that as-drawn Pd wires have superior electrical conductivity and can accommodate large strains by affording higher local buckling modes without fracture.We fabricate the Pd nanowires by the LDC process to achieve a smaller diameter range than what could be reached Compliant conductors with large stretching and bending capabilities are enabling novel fl e...

show abstract

Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires

Cited by 74 publications

References 21 publications

Micro-Scale Cyclic Bending Response of NiTi Shape Memory Alloy

Micro-Scale Cyclic Bending Response of NiTi Shape Memory Alloy

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

Highly Stretchable Conductors Made by Laser Draw‐Casting of Ultralong Metal Nanowires

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