Formation of a shock deformation induced ω phase in Zr 20 Nb alloy

Dey, G. K. ; Tewari, R. ; Banerjee, S. ; Jyoti, G. ; Gupta, S. C. ; Joshi, K. D. ; Sikka, S. K. (2004) Formation of a shock deformation induced ω phase in Zr 20 Nb alloy Acta Materialia, 52 (18). pp. 5243-5254. ISSN 1359-6454

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The formation of a plate shaped ω 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 β and the ω lattices was {111}β//(0001)ω and (11-0)β//(112-0)ω which is identical to that seen in case of ω phase forming in this alloy on thermal treatment. The experimentally determined habit plane of the plate shaped ω phase has been compared with that predicted from the phenomenological theory of martensite formation. A mechanism of transformation involving shear on the {112} planes has been considered. The importance of mechanical instability of the β phase in bringing about this transformation has been investigated. The mechanism of initiation of ω transformation has been ascertained by high resolution electron microscopy (HREM) of the β lattice and compared with that happening during ω formation in the same alloy by thermal treatment.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Shock Deformation; Zr-Nb Alloy; Transmission Electron Microscopy; HREM; Martensite
ID Code:9668
Deposited On:02 Nov 2010 11:12
Last Modified:14 May 2011 06:23

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