Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 1    January 2017

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Role of activation energies of individual phases in two-phase range on constitutive equation of Zr-2.5Nb-0.5Cu alloy
K. K. SAXENA1,4, S. K. JHA2, V. PANCHOLI1, G. P. CHAUDHARI1, D. SRIVASTAVA3, G. K. DEY3, N. SAIBABA2

1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology,
Roorkee-247667, Uttarakhand, India;
2. Nuclear Fuel Complex Limited, Hyderabad-501301, India;
3. Materials Science Division, Bhabha Atomic Research Center, Mumbai-40085, India;
4. Department of Mechanical Engineering, Insitute of Engineering and Technology,
GLA Uinversity, Mathura-281406, Uttar Pradesh, India

Abstract:Dominant phase during hot deformation in the two-phase region of Zr-2.5Nb-0.5Cu (ZNC) alloy was studied using activation energy calculation of individual phases. Thermo-mechanical compression tests were performed on a two-phase ZNC alloy in the temperature range of 700-925 °C and strain rate range of 10-2-10 s-1. Flow stress data of the single phase were extrapolated in the two-phase range to calculate flow stress data of individual phases. Activation energies of individual phases were then calculated using calculated flow stress data in the two-phase range. Comparison of activation energies revealed that α phase is the dominant phase (deformation controlling phase) in the two-phase range. Constitutive equations were also developed on the basis of the deformation temperature range (or according to phases present) using a sine-hyperbolic type constitutive equation. The statistical analysis revealed that the constitutive equation developed for a particular phase showed good agreement with the experimental results in terms of correlation coefficient (R) and average absolute relative error (AARE).

 

Key words: Zr-2.5Nb-0.5Cu alloy; hot deformation; activation energy; constitutive equation; two-phase material

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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