Compositional changes associated with periodic antiphase boundaries in the initial stages of ordering in Ni₃Mo. II. Elemental analysis

Energy dispersive analysis of X‐rays as an accessory to a transmission electron microscope has been used to investigate local compositional changes associated with the presence of periodic non‐conservative antiphase boundaries in the initial stages of ordering in Ni₃Mo. It is shown how a relative quantitative elemental analysis of the local alloy composition can be performed to a precision of better than 5%. A detailed analysis is described for 13.9 Å spaced periodic antiphase boundaries in Ni₃Mo where a local excess in Ni could be determined, leading to a composition of Ni_3.4Mo. The measurements confirm the proposed structural model.