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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Constitutive Model Prediction and Flow Behavior Considering Strain Response in the Thermal Processing for the TA15
Jiang Li1, Fuguo Li2, Jun Cai3
1State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China. lijiangcc@nwpu.edu.cn.
Abstract:
To investigate the flow stress, microstructure, and usability of TA15 titanium alloy, isothermal compression was tested at 1073⁻1223 K and strain rates of 10, 1, 0.1, 0.01, and 0.001 s-1, and strain of 0.9. The impact of strain and temperature on thermal deformation was investigated through the exponent-type Zener⁻Hollomon equation. Based on the influence of various material constants (including α, n, Q, and lnA) on the TA15 titanium alloy, the strain effect was included in the constitutive equation considering strain compensation, which is presented in this paper. The validity of the proposed constitutive equation was verified through the correlation coefficient (R) and the average absolute relative error (AARE), the values of which were 0.9929% and 6.85%, respectively. Research results demonstrated that the strain-based constitutive equation realizes consistency between the calculated flow stress and the measured stress of TA15 titanium alloy at high temperatures.
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