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- W1963504503 abstract "Abstract We have studied the mobility of defects in the frozen β phase of the Cu–Al–Ni shape memory alloys by mechanical spectroscopy as a function of temperature. In parallel, we have characterized the microstructure and their evolution with over-heating treatments. Thermal treatments have been performed in situ in a transmission electron microscope by using a heating stage. Internal friction and modulus defect measurements have been correlated with the microstructural observations by transmission electron microscopy. We discuss the behavior of the internal friction spectra, corresponding to over-heating in the β-phase, and propose microscopic mechanisms responsible for the evolution when the material is not in thermal equilibrium. In particular, the dislocations became mobile in the temperature range between 750 and 800 K where the L21 atomic order changes to the B2 order. A relaxation peak has been observed in the equilibrium β phase domain, which has been examined in detail by isothermal measurements as a function of frequency. The activation enthalpy of the peak has been determined to be 3.05 ± 0.1 eV, and possible microscopic mechanisms responsible for the peak are discussed." @default.
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- W1963504503 date "2006-12-01" @default.
- W1963504503 modified "2023-10-01" @default.
- W1963504503 title "Diffusion processes in Cu–Al–Ni shape memory alloys studied by mechanical spectroscopy and in situ transmission electron microscopy at high temperatures" @default.
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- W1963504503 doi "https://doi.org/10.1016/j.msea.2006.06.065" @default.
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