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Internal friction investigation of reverse martensitic transformation in oil‐quenched Ni 64 Al 36 alloy
Author(s) -
Zhou Z. C.,
Yan Y. J.,
Zhong M.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200824192
Subject(s) - materials science , alloy , differential scanning calorimetry , diffusionless transformation , internal friction , thermal , martensite , diffraction , thermodynamics , metallurgy , shape memory alloy , microstructure , composite material , optics , physics
Low‐frequency internal friction investigation of reverse martensitic transformation in oil‐quenched Ni 64 Al 36 alloy has been carried out using a multifunctional internal friction apparatus from room temperature to 400 °C and additionally differential scanning calorimetry and X‐ray diffraction experiments were also completed. It has been shown that an internal friction peak presents at about 220 °C in the internal friction–temperature curve during heating for the oil‐quenched Ni 64 Al 36 alloy but not for the furnace‐cooled Ni 64 Al 36 alloy. The peak still appears during cooling and the peak temperature shifts to lower temperature. The changes of the peak temperature positions cannot be visibly observed when the vibration frequency is changed. The peak heights increase with decreasing vibration frequency and increasing heating rate, being linearly directly proportional to $ \dot T / f $ It has been suggested that the internal friction peak results from reverse martensitic transformation of L1 0 → γ during heating and originates from martensitic transformation of γ → L1 0 during the subsequent cooling process. The influence of the thermal cycles on the transformation is not observed for the limited thermal cycles. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)