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An abnormal phenomenon was investigated in Ti_(44)Ni_(51)Nb_5 alloy which exhibits an absence of martensite transformation and a negative temperature dependence of electrical resistivity with the temperature decreasing.X-ray diffraction(XRD) analysis shows the matrix phase keeps a B2 structure during cooling without a martensite transformation,and dynamic mechanical analysis displays a frequency-dependent AC modulus/loss anomaly at T_g according to Vogel-Fulcher relation.Simultaneously,transmission electronic microscope(TEM) analysis manifests the superlattice spots at near 1/3 commensurate position,implying an existence of strain nanodomains with an R-like structure.And above experiment results provide evidence for the “strain glass” transition in defect-containing ferroelastic Ti_(44)Ni_(51)Nb_5 alloy.
An abnormal phenomenon was investigated in Ti_ (44) Ni_ (51) Nb_5 alloy which exhibits an absence of martensite transformation and a negative temperature dependence of electrical resistivity with the temperature decrease. X-ray diffraction (XRD) analysis shows the matrix phase keeps a B2 structure during cooling without a martensite transformation, and dynamic mechanical analysis displays a frequency-dependent AC modulus / loss anomaly at T_g according to Vogel-Fulcher relation. Simultaneous transmission electronic microscope (TEM) analysis manifests the superlattice spots at near 1/3 commensurate position, implying an existence of strain nanodomains with an R-like structure. End above experiment results provide evidence for the “strain glass ” transition in defect-containing ferroelastic Ti_ (44) Ni_ (51) Nb_5 alloy.