A complete microstructural characterization of the stoichiometric Ni2Cr alloy after different ageing times in which different degrees of order are attained has been carried out. The study of order-disorder transformation has been done using synchrotron radiation diffraction monitoring eventual changes in high-energy X-ray diffraction (HEXRD) patterns every six seconds in the course of differential scanning calorimetry DSC experiments. According to acquired data, the onset of the order-disorder transformation occurs at 630 °C, temperature higher than that reported in previous works. In addition, the appearance of fine carbide precipitation has also been found inside the grains and at grain boundaries. Both ordering of the stoichiometric Ni2Cr and carbide precipitation seems to be responsible for the strengthening of the alloy. The authors would like to acknowledge financial support of the Spanish Ministry of Science and Innovation under project PID2019-104382RB-I00. We would like to acknowledge the expert support of A. Tomás and M. Maher for assistance with the SEM and TEM at the Microscopy Laboratory of Cenim.as well as the expert support of C. Cepeda and E. Laurín for assistance with the alloy fabrication at IMDEA Materials and the heat treatments of the samples at CENIM, respectively. Peer reviewed