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001-es BibID:	BIBFORM086210
035-os BibID:	(WoS)000531826500113 (Scopus)85083983313
Első szerző:	Mohareb, Nora Samy (fizikus)
Cím:	Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni51Fe18Ga27Co4 Single Crystal / Nora Mohareb Samy, Daróczi Lajos, Tóth László Zoltán, Elena Panchenko, Yury Chumlyakov, Nikita Surikov, Beke Dezső László
Dátum:	2020
ISSN:	2075-4701
Megjegyzések:	Simultaneous differential scanning calorimetry, DSC, and acoustic emission, AE, measurements were carried out for single crystals of quenched and stress-induced martensite stabilized (SIM-aged) shape memory Ni51Fe18Ga27Co4 alloy. The transformation temperatures were shifted to higher values, the forward (from austenite to martensite) and reverse transitions became sharper and the width of the hysteresis increased in the SIM-aged sample. The energy distributions of acoustic hits showed similar behaviour to those of the quenched sample and the energy exponents, characterizing the power law behaviour, were also similar. For SIM-aged alloys at heating, in accordance with the sharper (burst-like) transition observed in the DSC run, few high-energy solitary hits were observed, and these hits did not fit to the energy distribution function fitted for smaller energies. Thus, these high-energy events were attributed to high sudden jumps in the phase transition during heating. The effect of long-range order (by applying a heat treatment at 573 K for 6 h to transform the B2 austenite to ordered L21 structure) and the SIM-aging on the transformation entropy was also investigated by DSC. It was found that the entropy was about 36% smaller after SIM-aging of the quenched sample and it was practically unchanged after austenite stabilization.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk transformation entropy acoustic emission stress-induced martensite stabilization shape memory alloys
Megjelenés:	Metals. - 10 : 4 (2020), p. 1-14. -
További szerzők:	Daróczi Lajos (1965-) (fizikus) Tóth László Zoltán (1989-) (fizikus) Panchenko, Elena Chumlyakov, Yury Surikov, Nikita Beke Dezső László (1945-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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