The Excel spreadsheet contains an overview tab (“Neutron Data”) which contains the name of each neutron diffraction run number, alongside the corresponding alloy and the temperature at which the data acquisition was carried out. The “Composition” tab contains the bulk composition of each alloy, as determined experimentally by SEM EDX. The “Precipitate Size” tab contains the areas of individual precipitates within each alloy. Between 128 and 345 precipitate areas are given for each alloy. The raw diffraction data are presented as individual ascii txt files for each run within the folder “Neutron Raw Data”. Each txt file is named as detailed in the Excel spreadsheet tab (“Neutron Data”). Each txt file contains four space-delimited columns of data (time-of-flight, d-spacing, intensity, intensity uncertainty).