Peritectoid formation of ordered Zr/sub 3/Al

Journal Article · Thu Jul 01 04:00:00 EDT 1976 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(76)90081-X· OSTI ID:7128727

Schulson, E M ^[1]; Graham, D B

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1. Atomic Energy of Canada Ltd., Chalk River, Ont.

The kinetics of the peritectoid transformation Zr + Zr/sub 2/Al ..-->.. Zr/sub 3/Al have been examined in Zr 7.6 to 9.0 wt% Al ingots using isothermal annealing and optical microscopy. The transformation is a nucleation and thermally activated growth process in which nucleation occurs heterogeneously at Zr/sub 2/Al/Zr interface and growth occurs by the diffusion controlled migration in opposite directions of the Zr/sub 3/Al/Zr and Zr/sub 3/Al/Zr/sub 2/Al interfaces. The nucleation rate is a maximum at approximately equal to 1160/sup 0/K (i.e., at approximately equal to 100/sup 0/K below the equilibrium peritectoid temperature). Isothermal transformation curves are presented and explained quantitatively in terms of the nucleation and parabolic growth kinetics.

• OSTI ID: 7128727
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 24:7; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
ANNEALING
BINARY ALLOY SYSTEMS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
KINETICS
MICROSCOPY
OPTICAL MICROSCOPY
ORDER PARAMETERS
PHASE TRANSFORMATIONS
REACTION KINETICS
VERY HIGH TEMPERATURE
ZIRCONIUM ALLOYS