Effect of Temperature and High Strain Rates on Deformation Induced Phase Transformation of Fe-Mn-Si-Al Alloys

摘要

The material behavior of Fe-Mn alloys with additions of Al and Si were investigated under tensile and compressive loading in a wide range of strain rate and temperature. The plastic flow behavior is shown to be strongly influenced by the characteristics of the strain-induced microstructural changes during deformation. During deformation, the investigated Fe-Mn-Si-Al-alloys exhibit the formation of mechanical twins, strain-induced ε (hcp)-, and α′ (bcc)- martensite in the γ (fcc) matrix. A continuous formation of high amounts of mechanical twins and deformation induced martensitic phase transformation are responsible to attain very high elongation and high stresses up to highest strain rates.