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説明:

Phase boundary, the interface between neighboring physical phases in matter, hosts various emergent phenomena and has been a pivotal subject of research interest for decades. Conventional techniques for the spatial resolution of phase boundaries rely on the interaction between the sample and certain probing particles, in which a pristine surface after stringent sample preparation and high vacuum are usually mandatory. Here we show that phase boundaries in metallic alloys can be resolved by lock-in thermography (LIT) in an ambient environment, even in the presence of a coating layer. An alternating charge current is applied through the sample, and the phase boundaries are revealed by the Peltier effect therein. We employ the LIT to visualize the propagation of phase boundaries in superelastic NiTi wires during the martensitic phase transition and demonstrate its capability to detect the martensite phase in a dental rotary file during mechanical bending. Furthermore, imaging of the phase boundaries in FeRh is successfully achieved using the same method, thereby demonstrating its broad applicability. This work offers a general technique for phase-boundary visualization in metallic materials, enabling versatile in situ nondestructive defectoscopy of phase-transition alloys in service.

権利情報:

• In Copyright
  

  ©2026 American Physical Society

キーワード: lock-in thermography, phase boundary, superelastic material

刊行年月日: 2026-10-07

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Applied (ISSN: 23317019) vol. 26 issue. 4 044024

研究助成金:

• National Natural Science Foundation of China 12234017
• USTC Center for Micro- and Nanoscale Research and Fabrication
• University of Science and Technology of China
• NEC Corporation
• CREST JPMJCR17I1
• ERATO
• JST JPMJER2201
• JSPS 22H04965

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.8667

公開URL: https://doi.org/10.1103/qf6k-jkm2

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更新時刻: 2026-10-19 10:05:26 +0900

MDRでの公開時刻: 2026-10-19 12:32:26 +0900