A Novel Strategy for the Design of Advanced Engineering Alloys-Strengthening Turbine Disk Superalloys via Twinning Structures

A novel strategy for designing advanced engineering superalloys using twin structure is presented. By inducing numerous annealing and deformation twins, a new advanced polycrystalline Ni-Co-base superalloy (TMW-4M3 alloy) has been developed, which has low stacking fault energy, enhanced tensile and creep strength without degrading other mechanical properties such as low cycle fatigue and crack growth resistance. Based on TEM analysis, the twin strengthening mechanism is proposed.