首页|Enhanced superelasticity and two-way shape memory properties of bamboo-grained Au7Cu5Al4 microwires
Enhanced superelasticity and two-way shape memory properties of bamboo-grained Au7Cu5Al4 microwires
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NSTL
Elsevier
A bamboo-like grain structure was obtained in melt-extraction Au7Cu5Al4 microwires via cyclic heat treatment. The superelasticity and two-way shape memory properties were investigated by performing uniaxial cyclic tensile tests and mechanically constrained thermal cycling, respectively. The superelasticity of bamboo-grained microwires was improved significantly duo to a reduction in the constraints caused by triple junctions. A recoverable strain of ~3% was achieved over a wide temperature range of 358-423 K for the bamboo-grained microwire, which exhibited excellent cyclic stability under a stress of up to 470 MPa. The two-way shape memory properties were determined by conducting load-biased thermal cycling tests, and a recoverable strain of 1.2% with a maximum work output of 1.2 J cm-3 was achieved under a stress of 100 MPa. The results indicate that the Au-Cu-Al shape memory alloy is a potential candidate for small-sized actuators operating in harsh environments.
NSTL
Elsevier
