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

Journal Article · Mon Oct 18 04:00:00 EDT 2004 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2004.07.008· OSTI ID:20634789

Dey, G K ^[1]; Tewari, R ^[1]; Banerjee, S ^[1]; Jyoti, G ^[2]; Gupta, S C ^[2]; Joshi, K D ^[2]; Sikka, S K ^[3]

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1. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
2. Applied Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
3. Office of the Principle Scientific Advisor to the Government of India, 324-A, Vigyan Bhavan Annexure, Maulana Azad Road, New Delhi 110011 (India)

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 <112> 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.

• OSTI ID: 20634789
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 18 Vol. 52; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
HABIT PLANES
MARTENSITE
NIOBIUM ALLOYS
ORIENTATION
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM ALLOYS