Abstract
The thermo-kinetics aspects of phase transformations in U rich U–xZr binary alloys, with x = 2, 5 and 10 wt% Zr have been investigated using dynamic calorimetry. The on-heating and cooling transformations at controlled scan rates in the range, 1–99 K min−1, have been monitored and the following transformation sequence is obtained at slow heating (3 K min−1) of a U–2Zr alloy: (i) α or α′ (distorted orthorhombic martensite) + δ(UZr2) → α + γ2 (bcc phase enriched in Zr); (ii) α + γ2 → β (tetragonal) + γ2; (iii) β + γ2 → β + γ1 (bcc phase enriched in U); (iv) β + γ1 → γ; (v) γ (bcc) → liquid (melting). Similar transformation sequence for other compositions with varying enthalpy effects has been witnessed for 5 and 10 Zr alloys. The observed transformation characteristics are rationalized for the effect of Zr content and heating/cooling rate variations.
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The authors acknowledge Dr. T. Jayakumar, director MMG and Shri S. C. Chetal, director IGCAR for their keen interest, sustained support and encouragement.
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Rai, A.K., Raju, S., Tripathy, H. et al. Phase Transformation Studies in U–xZr (x = 2, 5, 10 wt%) Alloys Using Dynamic Calorimetry. Trans Indian Inst Met 66, 387–390 (2013). https://doi.org/10.1007/s12666-013-0247-9
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DOI: https://doi.org/10.1007/s12666-013-0247-9