Abstract:Motivated by the rapid development of electrical vehicles, hybrid electrical vehicles and high-speed trains, permanent magnets are required to have higher temperature resistance and larger maximum energy product simultaneously. Increasing the replacement content of Fe for Co suitably is an effective method to prepare magnets with high temperature resistance and large maximum energy product, based on the advantage of high Curie temperature of 2∶17-type SmCo magnets. When Fe＞20%(mass fraction) in 2∶17-type SmCo magnets, however, the consequent structural defects may deteriorate the squareness of demagnetization curve and the coercivity, and in turn weaken the maximum energy product. In terms of the research status and problems of high iron content 2∶17-type SmCo magnets, this review provides the common structural defects in magnets from the perspectives of intragranular and grain boundaries, and summarizes the optimization methods and magnetic performance enhancement. The opportunities and challenges in the future of high iron content 2∶17-type SmCo magnets are also highlighted.