Abstract
Ni–Mn–Ga polycrystalline alloy fibers with diameters of 33 μm are reported to exhibit significantly improved ductility and huge superelastic and shape memory strains in comparison to conventional brittle bulk polycrystalline alloys. Particularly, the recoverable strain of the Ni54.9–Mn23.5–Ga21.6 fiber can be as high as 10% at 40 °C. Such optimized behavior has been achieved by a suitable fabrication process via a glass-coating melt spinning method. The superelastic properties at different temperatures and the shape memory effect of Ni54.9–Mn23.5–Ga21.6 fibers were investigated.
Highlights
The shape memory alloy (SMA) is an advanced class of smart materials that exhibit a unique phenomenon
Ni–Mn–Ga fibers, made by glass‐coated melt spinning method, which has a higher cooling rate, we report the Ni–Mn–Ga fibers, made by glass-coated melt spinning method, which has a higher showing perfect shape memory effect
The surface is is precisely circular, and the diameter of the fiber exhibits a higher uniformity than the fibers prepared precisely circular, and the diameter of the fiber exhibits a higher uniformity than the fibers prepared by the melt extracted method [25], which demonstrates the suitability of the glass‐coated melt by the melt extracted method [25], which demonstrates the suitability of the glass-coated melt spinning method for producing Ni–Mn–Ga fibers
Summary
The shape memory alloy (SMA) is an advanced class of smart materials that exhibit a unique phenomenon. Shape memory and superelasticity effects are believed to be driven by the crystallographically reversible martensitic transformation [1]. The shape memory behavior was first discovered in Au–Cd alloys [2] and afterwards observed in a number of systems, such as. Ti–Ni, Cu–Al–Ni [3], Ni–Mn–Ga, and Ni–Co–Mn–In alloys [4,5,6,7]. Novel potential systems with SMAs were reported. Fe–Mn–Al–Ni SMA [1] shows a small temperature dependence of the superelastic stress. High-entropy alloy system Ti–Zr–Hf–Co–Ni–Cu [8] shows wide temperature hysteresis of about 90 K at temperatures higher than 400 K of martensitic transformation
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