The microstructure of the second-phase particles in the Ti-55 alloy (Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd) have been studied by transmission electron microscopy. The second-phase particles present consist of a ''matrix'' (which can be either dark or bright) and some small dark blocks dispersed within this matrix. The dark blots correspond to Sn3O4 (triclinic structure, with a = 0.486nm, b = 0.588nm and c = 0.820nm). The matrix consists of a nanocrystalline phase with a stoichiometric Nd3Sn structure having a space group of Pm3m and a lattice parameter of a = 0.344nm. (C) Elsevier Science Inc., 1996.
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