Role of activation energies of individual phases in two-phase range on constitutive equation of Zr-2.5Nb-0.5Cu alloy

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• 作者：K.K. SAXENA^a ; ^d ; ^{saxena0081@gmail.com} ; S.K. JHA^b ; V. PANCHOLI^a ; G.P. CHAUDHARI^a ; D. SRIVASTAVA^c ; G.K. DEY^c ; N. SAIBABA^b
• 关键词：Zr&ndash ; 2.5Nb&ndash ; 0.5Cu alloy ; hot deformation ; activation energy ; constitutive equation ; two-phase material
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：172-183
• 全文大小：2157 K
• 卷排序：27

文摘

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).