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

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

doi:10.1063/1.3257372

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

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

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

95 Scopus citations

Abstract

We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu-Al-Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10-150 μm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%.

Original language	English (US)
Article number	171906
Journal	Applied Physics Letters
Volume	95
Issue number	17
DOIs	https://doi.org/10.1063/1.3257372
State	Published - 2009

Funding

Y.C. and C.A.S. acknowledge the support of the U.S. Army Research Office through the Institute for Soldier Nanotechnologies at MIT. X.X.Z. and D.C.D. acknowledge the support of the U.S. National Science Foundation through Grant No. DMR-805064 at NU (Dr. Alan Ardell monitor).

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Shape memory and superelasticity in polycrystalline Cu-Al-Ni microwires",

abstract = "We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu-Al-Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10-150 μm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%.",

author = "Ying Chen and Xuexi Zhang and Dunand, {David C.} and Schuh, {Christopher A.}",

note = "Funding Information: Y.C. and C.A.S. acknowledge the support of the U.S. Army Research Office through the Institute for Soldier Nanotechnologies at MIT. X.X.Z. and D.C.D. acknowledge the support of the U.S. National Science Foundation through Grant No. DMR-805064 at NU (Dr. Alan Ardell monitor).",

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doi = "10.1063/1.3257372",

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AU - Chen, Ying

AU - Zhang, Xuexi

AU - Dunand, David C.

AU - Schuh, Christopher A.

N1 - Funding Information: Y.C. and C.A.S. acknowledge the support of the U.S. Army Research Office through the Institute for Soldier Nanotechnologies at MIT. X.X.Z. and D.C.D. acknowledge the support of the U.S. National Science Foundation through Grant No. DMR-805064 at NU (Dr. Alan Ardell monitor).

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N2 - We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu-Al-Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10-150 μm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%.

AB - We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu-Al-Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10-150 μm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%.

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

Abstract

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