Abstract
We propose an x-lattice mechanism that is irrelevant to dislocation behaviors for a popular twinning ({112} {111}-type) system in body-centered-cubic (bcc) metals and alloys. The twinning process is dependent on the reverse transformation of ω (hexagonal) → bcc. The driving force of the twinning is attributed to the instability of a high density of nanoscale metastable ω precursors, and the mechanism has been experimentally and theoretically confirmed in bcc-Ti alloys with the {112} {111}-type twin formed under conditions free of external stress and internal strain. The ω-lattice mechanism involves bcc lattice shuffling only, thus can be applied to all bcc metals and alloys.
Original language | English |
---|---|
Pages (from-to) | 122-128 |
Number of pages | 7 |
Journal | Acta Materialia |
Volume | 62 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 Jan |
Externally published | Yes |
Keywords
- First-principles calculation
- Metals and alloys
- Microstructure
- Titanium alloy
- Twin
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys