Microstructural damage evolution and arrest in binary Fe-high-Mn alloys with different deformation temperatures

We investigated the damage evolution behaviors of binary Fe- 28- 40Mn alloys ( mass%) from 93 to 393 K by tensile testing. The underlying mechanisms of the microstructure- dependent damage evolution behavior were uncovered by damage quantification coupled with in situ strain mapping and postmortem microstructure characterization. The damage growth behaviors could be classified into three types. In type I, the Fe- 28Mn alloy at 93 K showed premature fracture associated with ductile damage initiation and subsequent quasi- cleavage damage growth associated with the e- martensitic transformation. In type II, the Fe- 28Mn alloy at 293 K and the Fe- 32Mn alloy at 93 K showed delayed damage growth but did not stop growing. In type III, when the stacking fault energywas > 19 mJ/ m2, the damage was strongly arrested until final ductile failure.