Details

Autor(en) / Beteiligte

• Dey, G.K.
• Tewari, R.
• Banerjee, S.
• Jyoti, G.
• Gupta, S.C.
• Joshi, K.D.
• Sikka, S.K.

Titel

Formation of a shock deformation induced {omega} phase in Zr 20 Nb alloy

Ist Teil von

• Acta materialia, 2004-10, Vol.52 (18)

Ort / Verlag

United States

Erscheinungsjahr

2004

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The formation of a plate shaped {omega} phase in Zr-Nb alloy after shock deformation has been studied with a view to ascertaining the nature of this transformation. The orientation relationship between the {beta} and the {omega} lattices was {l_brace}111{r_brace}{sub {beta}}//(0001){sub {omega}} and <11-bar 0>{beta}//<112-bar 0>{omega} which is identical to that seen in case of {omega} phase forming in this alloy on thermal treatment. The experimentally determined habit plane of the plate shaped {omega} phase has been compared with that predicted from the phenomenological theory of martensite formation. A mechanism of transformation involving shear on the planes has been considered. The importance of mechanical instability of the {beta} phase in bringing about this transformation has been investigated. The mechanism of initiation of {omega} transformation has been ascertained by high resolution electron microscopy (HREM) of the {beta} lattice and compared with that happening during {omega} formation in the same alloy by thermal treatment.