Rare twin linked to high-pressure phase transition in iron

• Published in: Scripta materialia Vol. 60; no. 9; pp. 772 - 775
• Main Authors: Dougherty, L.M., Gray, G.T., Cerreta, E.K., McCabe, R.J., Field, R.D., Bingert, J.F.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2009
• Subjects: Alpha iron; Dynamic phenomena; Electron back scatter diffraction; Electron backscattering diffraction (EBSD); Electron microscopy; Ferritic steels; Iron; Low carbon steels; Martensitic phase transformation; Microstructure; Peak pressure; Phase transformations; Steels; Transmission electron microscopy (TEM); Electron backscattering diffraction (EBSD); Ferritic steels; Dynamic phenomena; Transmission electron microscopy (TEM); Martensitic phase transformation
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2009.01.014

At approximately 13 GPa, body-centered cubic alpha-iron undergoes a fully reversible, pressure-induced phase transition into hexagonal close-packed epsilon-iron. Microstructural evidence of this phase transition has been identified in the fully reverted alpha-iron as a large number of {3 3 2} 〈 1 1 3 〉 twins found primarily as secondary twins within {1 1 2} 〈 1 1 1 〉 primary twins. The {3 3 2} 〈 1 1 3 〉 twins were produced during high-pressure shock-loading of 1018 steel at a peak pressure above the alpha-epsilon phase transition pressure. The twins were identified using electron backscattered diffraction and transmission electron microscopy.