Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 19: Poster Session
MM 19.42: Poster
Tuesday, March 10, 2026, 18:00–20:00, P5
Anomalous resistance behavior of NiTi alloys at high temperatures — •Tianyi Xu1, Leo Pies1, Oluwaseyi Oluwabi2, Sven Graus1, Andreas Kreyßig1, Jan Frenzel2, and Anna E. Böhmer1 — 1Experimental Physics IV, Ruhr-University Bochum, Bochum, Germany — 2Institute for Materials, Ruhr-University Bochum, Bochum, Germany
NiTi-based shape-memory alloys, widely used in actuators, biomedical devices, and high-precision components, are well known for their thermally driven phase transformations and associated functional properties. While their structural behavior has been extensively characterized, the electrical transport properties—particularly at elevated temperatures—remain comparatively unexplored, despite their relevance for high-temperature functional applications. In this work, the electrical resistance of Ni1+xTi1−x was determined up to temperatures of more than 700 ∘C. The resistive signature of the established martensite-austenite transition was clearly detected. Remarkably, the resistance exhibits a reproducible exponential increase as the temperature exceeds 500 ∘C.
This high-temperature behavior has not been reported previously and suggests that additional mechanisms—beyond the known phase transitions—govern charge transport in NiTi at elevated temperatures. These findings highlight the need for deeper investigation of high-temperature electronic behavior in shape-memory alloys. We will discuss the possible mechanisms resulting in this behavior, including the formation of precipitate phases.
Keywords: shape-memory alloys; high-temperature behavior; electrical transport