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Kusama T, Omori T, Saito T, Kise S, Tanaka T, Araki Y, Kainuma R. Ultra-large single crystals by abnormal grain growth. Nat Commun 2017; 8:354. [PMID: 28842571 PMCID: PMC5572478 DOI: 10.1038/s41467-017-00383-0] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/26/2017] [Indexed: 11/09/2022] Open
Abstract
Producing a single crystal is expensive because of low mass productivity. Therefore, many metallic materials are being used in polycrystalline form, even though material properties are superior in a single crystal. Here we show that an extraordinarily large Cu-Al-Mn single crystal can be obtained by abnormal grain growth (AGG) induced by simple heat treatment with high mass productivity. In AGG, the sub-boundary energy introduced by cyclic heat treatment (CHT) is dominant in the driving pressure, and the grain boundary migration rate is accelerated by repeating the low-temperature CHT due to the increase of the sub-boundary energy. With such treatment, fabrication of single crystal bars 70 cm in length is achieved. This result ensures that the range of applications of shape memory alloys will spread beyond small-sized devices to large-scale components and may enable new applications of single crystals in other metallic and ceramics materials having similar microstructural features.Growing large single crystals cheaply and reliably for structural applications remains challenging. Here, the authors combine accelerated abnormal grain growth and cyclic heat treatments to grow a superelastic shape memory alloy single crystal to 70 cm.
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Affiliation(s)
- Tomoe Kusama
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai, Miyagi, 980-8579, Japan
| | - Toshihiro Omori
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai, Miyagi, 980-8579, Japan.
| | - Takashi Saito
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai, Miyagi, 980-8579, Japan
| | - Sumio Kise
- Technology Development Department, Special Metals Division, Furukawa Techno Material Co., Ltd., 5-1-8 Higashi-yawata, Hiratsuka, Kanagawa, 254-0016, Japan
| | - Toyonobu Tanaka
- Technology Development Department, Special Metals Division, Furukawa Techno Material Co., Ltd., 5-1-8 Higashi-yawata, Hiratsuka, Kanagawa, 254-0016, Japan
| | - Yoshikazu Araki
- Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto, 615-8540, Japan
| | - Ryosuke Kainuma
- Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai, Miyagi, 980-8579, Japan
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Gómez-Cortés JF, Nó ML, López-Ferreño I, Hernández-Saz J, Molina SI, Chuvilin A, San Juan JM. Size effect and scaling power-law for superelasticity in shape-memory alloys at the nanoscale. NATURE NANOTECHNOLOGY 2017; 12:790-796. [PMID: 28553962 DOI: 10.1038/nnano.2017.91] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 04/10/2017] [Indexed: 06/07/2023]
Abstract
Shape-memory alloys capable of a superelastic stress-induced phase transformation and a high displacement actuation have promise for applications in micro-electromechanical systems for wearable healthcare and flexible electronic technologies. However, some of the fundamental aspects of their nanoscale behaviour remain unclear, including the question of whether the critical stress for the stress-induced martensitic transformation exhibits a size effect similar to that observed in confined plasticity. Here we provide evidence of a strong size effect on the critical stress that induces such a transformation with a threefold increase in the trigger stress in pillars milled on [001] L21 single crystals from a Cu-Al-Ni shape-memory alloy from 2 μm to 260 nm in diameter. A power-law size dependence of n = -2 is observed for the nanoscale superelasticity. Our observation is supported by the atomic lattice shearing and an elastic model for homogeneous martensite nucleation.
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Affiliation(s)
- Jose F Gómez-Cortés
- Departamento Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo 644, 48080 Bilbao, Spain
| | - Maria L Nó
- Departamento Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo 644, 48080 Bilbao, Spain
| | - Iñaki López-Ferreño
- Departamento Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo 644, 48080 Bilbao, Spain
| | - Jesús Hernández-Saz
- Departamento de Ciencia de los Materiales e I.M. y Q.I, Facultad de Ciencias, IMEYMAT, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Sergio I Molina
- Departamento de Ciencia de los Materiales e I.M. y Q.I, Facultad de Ciencias, IMEYMAT, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Cádiz, Spain
| | - Andrey Chuvilin
- CIC nanoGUNE, Tolosa Hiribidea 76, 20018 Donostia-San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, 48013 Bilbao, Spain
| | - Jose M San Juan
- Departamento Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo 644, 48080 Bilbao, Spain
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Bundara B, Tokuda M, Kuselj B, Ule B, Tuma JV. Superelastic tension and bending characteristics of shape memory alloys. ACTA ACUST UNITED AC 2000. [DOI: 10.1007/bf03028074] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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