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TEM investigation of the formation mechanism of deformation twins in Fe–Mn–Si–Al TWIP steels |
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| Authors: | H Idrissi K Renard D Schryvers |
| Institution: | 1. EMAT, Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.;2. Institute of Mechanics, Materials and Civil Engineering, IMAP, Université catholique de Louvain (UCL), Place Sainte Barbe 2, B-1348, Louvain-la-Neuve, Belgium.;3. Institute of Mechanics, Materials and Civil Engineering, IMAP, Université catholique de Louvain (UCL), Place Sainte Barbe 2, B-1348, Louvain-la-Neuve, Belgium. |
| Abstract: | The microstructure of a Fe–Mn–Si–Al twinning-induced plasticity (TWIP) steel exhibiting remarkable work hardening rate under uniaxial tensile deformation was investigated using transmission electron microscopy to uncover the mechanism(s) controlling the nucleation and growth of the mechanically induced twins. The results show that the stair-rod cross-slip deviation mechanism is necessary for the formation of the twins, while large extrinsic stacking faults homogenously distributed within the grains could act as preferential sources for the activation of the deviation process. The influence of such features on the thickness and strength of the twins and the resulting mechanical behaviour is discussed and compared to similar works recently performed on Fe–Mn–C TWIP steels. |
| Keywords: | Fe–Mn–Si–Al TWIP steels transmission electron microscopy extended defects twinning mechanisms |