Abstract Scope |
Twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) are well known effects to enhance strain hardening leading to both high strength and large tensile ductility. Since thin twins and hard martensite evolve,, respectively, during deformation, it is possible to consider that the microstructures become dynamically heterogeneous in TWIP and TRIP. From this standpoint, the author would like to show that new deformation modes, such as deformation twins, martensite, and abnormal slip systems, may nucleate from grain boundaries to realize both high strength and large ductility in metallic materials having recrystallized ultra fine grained structures. |