Ion irradiation-induced amor phizat ion of TiNiCu shape memory alloy

The 400 keV Xe+ ion irradiation and in-situ TEM observation were performed in a TiNiCu shape memory alloy using the HVEM-Tandem Facility at the Argonne National Laboratory at the room temperature, and the ion flux was 1.25×1011 ions/cm2 s. The structural damage upon irradiation was monitored by the selected area electron diffraction patterns (SAED) under in-situ TEM observations. The amorphization trasformation was determined by the disappearance of all diffraction maxima in the SAED patterns and microstructural contrast. The results show that the disorder starts at 0.05 dpa, and the contrast of martensitic variants and the superlattice start disappearing in the TiNiCu shape.sample. The TiNiCu shape memory alloy becomes amorphous at a dose of -0.4 dpa.

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