Iron-Chromium is an ideal model system to improve the fundamental understanding of phase separation with vital engineering applications. For instance, ferritic and duplex stainless steels, with Fe-Cr basis, suffer from embrittlement, and cemented carbide cutting tools and coatings can be strengthened, using phase separation. Thus, a better fundamental understanding of the kinetics of phase separation has large technical implications e.g. in power generation applications (stainless steels) and in metal cutting applications (cemented carbides and coatings). The principal investigators have a large fundamental activity within this field and large industrial collaborations in both areas. However, we are lacking insight in the dynamics of phase separation and this is the purpose of the proposal. Neutron scattering provides the only viable method to study the early-stage kinetics.