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Shape memory alloys (SMAs) are smart materials that are widely used to create intelligent devices because of their high energy density, actuation strain, and biocompatibility characteristics. Given their unique properties, SMAs are found to have significant potential for implementation in many emerging applications in mobile robots, robotic hands, wearable devices, aerospace/automotive components,...
In article number 1801023, Sung‐Hoon Ahn and co‐workers report shape memory alloy (SMA) microactuators providing an application for artificial muscle fibers. The diamond‐shaped frame structure of the actuators allows up to 60 percent strain in tensile motion and its high surface‐area‐to‐volume ratio enhances thermal response of SMA to achieve 1.6 kHz actuation speed with optical heating.
Shape memory alloys (SMAs) are widely utilized as an actuation source in microscale devices, since they have a simple actuation mechanism and high‐power density. However, they have limitations in terms of strain range and actuation speed. High‐speed microscale SMA actuators are developed having diamond‐shaped frame structures with a diameter of 25 µm. These structures allow for a large elongation...
Ti–30Ni–20Cu (at.%) alloy ribbons with an average grain size of 0.25–0.28μm were obtained by applying two-step annealing, comprising a first annealing step at 773–823K and a second annealing step at 748K, to amorphous melt-spun ribbons, which was very small compared with ribbons obtained by one-step annealing at 748–823K (0.64–1.20μm). Hysteresis and elongation associated with the B2–B19 transformation...
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