Determination of Instability in Zr-2.5Nb-0.5Cu Using Lyapunov Function

Kuldeep Kumar Saxena; Vivek Pancholi; Dinesh Srivastava; G.K. Dey; Sanjay K. Jha; Nudurupati Saibaba

doi:10.4028/www.scientific.net/MSF.830-831.329

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HomeMaterials Science ForumMaterials Science Forum Vols. 830-831Determination of Instability in Zr-2.5Nb-0.5Cu...

Determination of Instability in Zr-2.5Nb-0.5Cu Using Lyapunov Function

Abstract:

Hot workability of Zr-2.5Nb-0.5Cu alloy has been investigated by means of hot compression test using Gleeble-3800^®, in the temperature and strain rate range of 700 to 925°C and 0.01-10s^-1, respectively. Deformation behavior was characterized in terms of flow instability using peak stress with the help of Lyapunov Function. The true stress-strain curves shows that softening occurs at all lower temperature and for entire strain rates of deformation. The instable flow was suggested by negative m value at deformation condition of 700°C (5 and 10 s^-1), while s value at 925°C (10 s^-1). The combined result of rate of change of m and s with respect to log strain rate suggest that the deformation condition ranges from 725-780°C (10^-2- 10^-1 s^-1) and 700°C (1-10 s^-1) representing safe domain for stable flow.

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Periodical:

Materials Science Forum (Volumes 830-831)

Pages:

329-332

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.830-831.329

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Online since:

September 2015

Authors:

Kuldeep Kumar Saxena, Vivek Pancholi*, Dinesh Srivastava, G.K. Dey, Sanjay K. Jha, Nudurupati Saibaba

Keywords:

Flow Instability, Hot Deformation, Lyapunov Function, Zr-2.5Nb-0.5Cu

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* - Corresponding Author

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