In situ X-ray diffraction study of the phase transformation in the non-stoichiometric intermetallic compound Ti3Sn

Abstract Phase transformations of Ti 75.5 Sn 24.5 were investigated using in situ X-ray diffraction during heating. The as cast Ti 75.5 Sn 24.5 was found to consist mainly of an orthorhombic Cmcm phase at room temperature; upon heating to 473 K the material undergoes a reversible group-subgroup transition to hexagonal P6 3 /mmc (D0 19 ) phase. Crystal structure and lattice parameters of the orthorhombic phase are suggested based on X-ray and electron diffraction results. The crystallographic relation between parent and product phase is also discussed.