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Polish Academy of Sciences

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W. Tasaki


Recent publications
1.  Golasiński K., Maj M., Tasaki W., Pieczyska E.A., Kim H., Full-Field Deformation Study of Ti–25Nb, Ti–25Nb–0.3O and Ti–25Nb–0.7O Shape Memory Alloys During Tension Using Digital Image Correlation, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-024-07414-8, pp.1-10, 2024

Abstract:
A Ti–25Nb shape memory alloy (SMA) exhibits shape memory effect associated with stress-induced martensitic transformation from β to α″ phase. Addition of oxygen stabilizes the β phase and changes stress–strain response. Oxygen-added Ti–25Nb SMAs show a more distinct superelastic behavior. In this work, digital image correlation (DIC) was applied to investigate for the first time full-field deformation of Ti–25Nb, Ti–25Nb–0.3O and Ti–25Nb–0.7O (at. pct) SMAs. The specimens were subjected to loading–unloading tensile tests to study local and global mechanical characteristics related to activity of particular deformation mechanisms of the SMAs. Strain and strain rate fields were quantitatively compared at selected stages of each SMA’s deformation. It was found that the Ti–25Nb SMA exhibits a macroscopically localized Lüders-type deformation associated with the stress-induced phase transformation, whereas Ti–25Nb–0.3O and Ti–25Nb–0.7O SMAs show more discrete types of deformation related to activity of interstitial oxygen atoms. As a consequence, at particular stages of deformation, local values of strain rate of Ti–25Nb SMA were significantly higher than those of average strain rate. The results obtained in this paper provide a better understanding of the deformation mechanism in the oxygen-added Ti–25Nb based SMAs.

Affiliations:
Golasiński K. - other affiliation
Maj M. - IPPT PAN
Tasaki W. - other affiliation
Pieczyska E.A. - IPPT PAN
Kim H. - other affiliation

Conference abstracts
1.  Golasiński K.M., Maj M., Tasaki W., Pieczyska E.A., Kim H.Y., TENSILE LOADING OF Ti-25Nb-0.7O SHAPE MEMORY ALLOY MONITORED BY INFRARED THERMOGRAPHY AND DIGITAL IMAGE CORRELATION, QIRT 2024, 17th Quantitative Infrared Thermography Conference, 2024-07-01/07-05, Zagreb (HR), No.5, 5-B, pp.93-93, 2024
2.  Golasiński K.M., Maj M., Tasaki W., Pieczyska E.A., Kim H.Y., Lüders-type deforma0on of Ti-25Nb shape memory alloy in tension inspected by digital image correlation and infrared thermography, ESOMAT 2024, 13th European Symposium on Martensitic Transformations, 2024-08-26/08-30, Lecco (IT), pp.042-042, 2024
3.  Golasiński K.M., Ranachowski Z., Brodecki A., Tasaki W., Urbański L., Pieczyska E.A., Kim H.Y., Acoustic emission study of Ti-25Nb and Ti-25Nb-1.0O shape memory alloys in the initial stage deformation, SolMech 2024, 43rd Solid Mechanics Conference, 2024-09-16/09-18, Wrocław (PL), pp.103-103, 2024

Keywords:
Ni-free shape memory alloys, interstitials atoms, stress-induced phase transformation, acoustic emission

Affiliations:
Golasiński K.M. - IPPT PAN
Ranachowski Z. - IPPT PAN
Brodecki A. - IPPT PAN
Tasaki W. - other affiliation
Urbański L. - IPPT PAN
Pieczyska E.A. - IPPT PAN
Kim H.Y. - other affiliation
4.  Golasiński K.M., Tasaki W., Maj M., Pieczyska E.A., Kim H.Y., EFFECT OF OXYGEN ON MECHANICAL BEHAVIOR OF Ti-25Nb BASED SHAPE MEMORY ALLOYS, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), pp.284-285, 2022

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