Resumo

TOLLEY, A. J.  e  SANCHEZ, E. A.. Phase trasnformations induced by irradiation with ions IN b Cu-Zn-Al single crystals. Lat. Am. appl. res. [online]. 2002, vol.32, n.4, pp.317-320. ISSN 0327-0793.

Single crystals of b Cu-Zn-Al alloys were irradiated with 30 keV Ar ions at room temperature to fluences in the range of 1 to 6 displacements per atom (dpa). The microstructural changes induced by the irradiation were investigated with transmission electron microscopy. Specimens with two different surface orientations, (100)_b and (011)_b, were studied. In specimens with (100)_b surface orientation a new phase with a hexagonal close packed structure was formed due to the ion irradiation. The orientation relationship with the matrix was of the type: (0001)_Hex || (0` 1 1)<sub>b</sub> ; [1`1 0 0]_Hex || [011] _b In specimens with (011)_b surface orientation, the hexagonal structure was not observed. Instead, small precipitates of the g phase with a mean size of 8 nm were found. The results are discussed in comparison with previous ion irradiation experiments and with similar phase transformations occurring in b Cu-Zn-Al alloys.

Palavras-chave : Radiation effects; Cu-Zn-Al alloys; Transmission electron microscopy; Phase transformations; Phase stability.

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