Ni-Ti-Hf high-temperature shape memory alloy: Measure of the Clausius-Clapeyron coefficient through mechanical spectroscopy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:856

Article

Perez-Cerrato, M.¹  Maass, B.²  No, M. L.³  San Juan, J. M.¹ 

[1] Univ Basque Country, Fac Ciencia & Tecnol, Dept Fis Mat Condensada, UPV EHU, Apdo 644, Bilbao 48080, Spain

[2] Ingpuls GmbH, Von Wadthause Str 77, D-44894 Bochum, Germany

[3] Univ Basque Country, Fac Ciencia & Tecnol, Dept Fis Aplicada 2, UPV EHU, Apdo 644, Bilbao 48080, Spain

关键词: Metals and alloys;    Shape memory;    Mechanical properties;    Phase transitions;   

DOI  :  10.1016/j.jallcom.2020.157948

来源: Elsevier

【 摘 要 】

The martensitic transformation of Ni49.5Ti35.5Hf15 high temperature shape memory alloy is characterized by internal friction measurements. The temperatures for the reversible B2 <-> B19' transformation appear in the range 410-479 K on cooling and 447-526 K on heating. In addition, a strong anomalous pre-martensitic softening of the dynamic modulus is reported in the high-temperature phase, between 850 K and 550 K, evidencing the thermoelastic character of this family of alloys. Based on the analysis of the internal friction spectra, a theoretical and experimental methodology is proposed to measure the Clausius-Clapeyron coefficient through mechanical spectroscopy. This new non-destructive method could be extremely useful for the development of advanced prototypes of shape memory alloys. (C) 2020 The Author(s). Published by Elsevier B.V.

【 授权许可】

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