4.8 Article

Ultrahigh cycle fatigue of nanocrystalline NiTi tubes for elastocaloric cooling

期刊

APPLIED MATERIALS TODAY
卷 26, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apmt.2022.101377

关键词

Ultrahigh fatigue life; Elastocaloric cooling; Shape memory alloys (SMAs); Nanocrystalline materials; Martensitic phase transformation

资金

  1. Hong Kong Research Grant Council (GRF Project) [16206119]
  2. Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone [HZQB-KCZYB-2020083]
  3. Science, Technology and Innovation Commission of Shenzhen Municipality of China [SGDX2019081623360564]
  4. National Natural Science Foundation of China [52122102]
  5. Natural Science Foundation of Guangdong [2019A1515011755]
  6. [C2M3]

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This study reports the ultrahigh fatigue life of nanocrystalline NiTi tubes, exceeding 120 million cycles, with stable cyclic stress-strain responses and a stable adiabatic temperature drop. The high resistance to nucleation and growth of compression-parallel cracks contributes to the ultrahigh fatigue life of the tubes.
Elastocaloric cooling using superelastic NiTi shape memory alloy with reversible phase transformation is a promising environmentally friendly technology, but the limited fatigue life of conventional coarse grained NiTi remains a crucial bottleneck. Here, we report the ultrahigh fatigue life of nanocrystalline NiTi tubes, exceeding 120 million cycles under a compressive stress of 800 MPa. The NiTi tubes demonstrate stable cyclic stress-strain responses and a stable adiabatic temperature drop of 6.6 K in the lifespan. The material coefficient of performance increases from the initial 8.8 to 11.6 of the 10(8)th compressive cycle. The high resistance to nucleation and growth of compression-parallel cracks results in the ultrahigh fatigue life of the tubes. Our research shows the great potentials of nanocrystalline NiTi tubes with both stable thermomechanical properties and long compressive fatigue lives for reliable elastocaloric cooling. (c) 2022 Elsevier Ltd. All rights reserved.

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