The impossibility of pseudotwinning in B2 alloys
- Univ. of Oxford (United Kingdom). Dept. of Materials
There are three reported observations of pseudotwins in B2 alloys. It is argued here that pseudotwinning using the usual b.c.c. twinning mode is impossible if the alloys are fully ordered. The argument is based on energetic grounds, using first-principles quantum mechanical calculations. Before continuing, some clarification of the nomenclature is needed. Since b.c.c. twinning of both the B2 and D0{sub 3} crystals (that is to say, twinning in the system K{sub 1} = (112) {eta}{sub 2} = [111]) produces a different phase, this is not strictly twinning. It is right to call this pseudotwinning, the connotation being that it has all the outward appearances of a twin, but turns out not to be a twin upon a detailed examination of the state of order and space group. True twinning is used to denote a twin that restores both the lattice and the state of order.
- OSTI ID:
- 55359
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 5 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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