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- W2768449257 abstract "Abstract The electrical resistivity, Seebeck coefficient, thermal conductivity, and specific heat of Ti 50 Ni 50- x Fe x ( x = 2.0–10.0 at.%) shape memory alloys (SMAs) were measured to investigate the influence of point defects (Fe) on the martensitic transformation characteristics. Our results show that the Ti 50 Ni 48 Fe 2 and Ti 50 Ni 47 Fe 3 SMAs have a two-step martensitic transformation (B2 → R and R → B19′), while the Ti 50 Ni 46 Fe 4 , Ti 50 Ni 44.5 Fe 5.5 , and Ti 50 Ni 44 Fe 6 SMAs display a one-step martensitic transition (B2 → R). However, the compounds Ti 50 Ni 42 Fe 8 and Ti 50 Ni 40 Fe 10 show strain glass features (frozen strain-ordered state). Importantly, the induced point defects significantly alter the martensitic transformation characteristics, namely transition temperature and width of thermal hysteresis during the transition. This can be explained by the stabilization of austenite B2 phase upon Fe substitution, which ultimately leads to the decrease in enthalpy that associated to the martensitic transition. To determine the boundary composition that separates the R-phase and strain glass systems in this series of SMAs, a Ni-rich specimen Ti 49 Ni 45 Fe 6 was fabricated. Remarkably, a slight change in Ti/Ni ratio converts Ti 49 Ni 45 Fe 6 SMA into a strain glass system. Overall, the evolution of phase transformation in the Fe-substituted TiNi SMAs is presumably caused by the changes in local lattice structure via the induced local strain fields by Fe point defects." @default.
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- W2768449257 date "2017-11-27" @default.
- W2768449257 modified "2023-09-27" @default.
- W2768449257 title "Characteristics of martensitic and strain-glass transitions of the Fe-substituted TiNi shape memory alloys probed by transport and thermal measurements" @default.
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- W2768449257 doi "https://doi.org/10.1038/s41598-017-16574-0" @default.
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