Influence of electron irradiation on the martensitic transformation of a binary TiNi shape memory alloy

TiNi shape memory alloy samples annealed at 673 K for 1 h were irradiated within R-phase by 1.7-MeV electrons with different doses. The two-step martensitic transformation temperatures were measured by differential scanning calorimeter. The results indicated that the temperature M s of the onset of...

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Veröffentlicht in:	Journal of alloys and compounds 2003-03, Vol.351 (1), p.87-90
Hauptverfasser:	Zu, X.T., Lin, L.B., Wang, Z.G., Zhu, S., You, L.P., Wang, L.M., Huo, Y.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Defects and impurities in crystals microstructure Exact sciences and technology Intermetallics Martensitic transformations Materials science Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Other interactions of matter with particles and radiation Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Point defects Point defects (vacancies, interstitials, color centers, etc.) and defect clusters Positron annihilation Positron spectroscopies Radiation treatment (particle and electromagnetic) Radiation treatments Scanning and transmission electron microscopy Structure of solids and liquids crystallography Treatment of materials and its effects on microstructure and properties
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Zusammenfassung:	TiNi shape memory alloy samples annealed at 673 K for 1 h were irradiated within R-phase by 1.7-MeV electrons with different doses. The two-step martensitic transformation temperatures were measured by differential scanning calorimeter. The results indicated that the temperature M s of the onset of R-phase-to-martensite transformation decreased with increasing electron dose. The electron irradiation had a slight effect on the other transformation temperatures. The second lifetime of positrons determined by positron annihilation technology were lowered with increment of the irradiated dose. Relaxation of the elastic stress fields around the Ti 3Ni 4 precipitates was the cause of the observed change of the transformation characteristics because of the migration and accumulation of irradiation-induced point defects.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/S0925-8388(02)01080-0