Predicting the flow stress behavior of Ni-42.5Ti-3Cu during hot deformation using constitutive equations

Etaati, Amir and Dehghani, Kamran and Ebrahimi, G. R. and Wang, Hao (2013) Predicting the flow stress behavior of Ni-42.5Ti-3Cu during hot deformation using constitutive equations. Metals and Materials International, 19 (1). pp. 5-9. ISSN 1598-9623


The hot deformation behavior of ternary Ni-42.5Ti-3Cu alloy was modeled. Hot compression tests were carried out at the temperatures from 800°C to 1000°C and at the strain rates of 0.001 s−1 to 1 s−1. The experimental results were then used to determine the constants for developing constitutive equations. There was an unacceptable fitting between the predicted and experimental results using Zener-Hollomon parameter in a hyperbolic sinusoidal equation form. The mismatches among the experimental and predicted results were
observed almost for all tested conditions. By modifying the Zener-Hollomon parameter for the compensation of strain rate, a very good agreement was achieved between the predicted values and experimental ones. Both predicted and experimental stress-strain curves illustrate the occurrence of dynamic recrystallization. Also, in both cases, the peak and steady state stresses raised with decrease of temperature and increase of strain rate. The very good agreement between the measured and predicted results indicates the high accuracy of developed model and constitutive equations which can be used for predicting and analyzing the hot deformation behavior of Ni-42.5Ti-3Cu.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 The Korean Institute of Metals and Materials. Permanent restricted access to published version due to publisher copyright policy.
Faculty/School / Institute/Centre: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 17 Apr 2013 01:16
Last Modified: 11 Aug 2014 02:41
Uncontrolled Keywords: shape memory alloys; thermomechanical processing; recrystallization; compression test; mathematical model
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1007/s12540-013-1002-9

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