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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.19440 |
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| _version_ | 1866929648796958720 |
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| author | Yan, Kai Chu, Kangjie Hua, Peng Wei, Pengbo Gu, Hanlin Zhuang, Qiming He, Weifeng Ren, Fuzeng Sun, Qingping Ritchie, Robert O. |
| author_facet | Yan, Kai Chu, Kangjie Hua, Peng Wei, Pengbo Gu, Hanlin Zhuang, Qiming He, Weifeng Ren, Fuzeng Sun, Qingping Ritchie, Robert O. |
| contents | Elastocaloric cooling with shape memory alloys (SMAs) is emerging as a promising candidate for next-generation, environmentally friendly refrigeration. However, its development is hindered by the large driving force and low efficiency associated with uniaxial loading modes. In response, we present an innovative elastocaloric air cooling approach that utilizes the bending of NiTi beams, offering a low-force and energy-efficient solution. We achieve a continuous maximum temperature drop of 0.91 K and a dissipated energy of 15.1 N mm at a low specific driving force of 220 N. Notably, the specimen achieves over 5 million cycles under a maximum surface tensile strain of 1.94% for macroscopic cyclic bending, via a pre-strained, warm laser shock peening (pw-LSP) method. This unprecedented fatigue resistance originates from the formation of a hierarchical microstructure and a large compressive residual stress of over 1 GPa. This work demonstrates the great potential of bending induced elastocaloric cooling in the near future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_19440 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Low driving-force stable bending cooling via fatigue-resistant hierarchical NiTi shape memory alloy Yan, Kai Chu, Kangjie Hua, Peng Wei, Pengbo Gu, Hanlin Zhuang, Qiming He, Weifeng Ren, Fuzeng Sun, Qingping Ritchie, Robert O. Materials Science Elastocaloric cooling with shape memory alloys (SMAs) is emerging as a promising candidate for next-generation, environmentally friendly refrigeration. However, its development is hindered by the large driving force and low efficiency associated with uniaxial loading modes. In response, we present an innovative elastocaloric air cooling approach that utilizes the bending of NiTi beams, offering a low-force and energy-efficient solution. We achieve a continuous maximum temperature drop of 0.91 K and a dissipated energy of 15.1 N mm at a low specific driving force of 220 N. Notably, the specimen achieves over 5 million cycles under a maximum surface tensile strain of 1.94% for macroscopic cyclic bending, via a pre-strained, warm laser shock peening (pw-LSP) method. This unprecedented fatigue resistance originates from the formation of a hierarchical microstructure and a large compressive residual stress of over 1 GPa. This work demonstrates the great potential of bending induced elastocaloric cooling in the near future. |
| title | Low driving-force stable bending cooling via fatigue-resistant hierarchical NiTi shape memory alloy |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.19440 |