An abnormal phenomenon was investigated in Ti<sub>44</sub>Ni<sub>51</sub>Nb<sub>5</sub> alloy which exhibits an absence of martensite transformation and a negative temperature depen...An abnormal phenomenon was investigated in Ti<sub>44</sub>Ni<sub>51</sub>Nb<sub>5</sub> 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 <sub>g</sub> 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<sub>44</sub>Ni<sub>51</sub>Nb<sub>5</sub> alloy.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51271010)
文摘An abnormal phenomenon was investigated in Ti<sub>44</sub>Ni<sub>51</sub>Nb<sub>5</sub> 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 <sub>g</sub> 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<sub>44</sub>Ni<sub>51</sub>Nb<sub>5</sub> alloy.
