Abstract
In order to establish a model between the grain size and the process parameters, the hot deformation behaviors of Ti-49.5Al alloy was investigated by isothermal compressive tests at temperatures ranging from 800 to 1 100 °C with strain rates of 10−3∓10−1 s−1. Within this range, the deformation behavior obeys the power law relationship, which can be described using the kinetic rate equation. The stress exponent, n, has a value of about 5.0, and the apparent activation energy is about 320 J/mol, which fits well with the value estimated in previous investigations. The results show that, the dependence of flow stress on the recrystallized grain size can be expressed by the equation: σ=K 1 d rex −0.56. The relationship between the deformed microstructure and the process control parameter can be expressed by the formula: 1gd rex=−0.281 1gZ + 3.9081.
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Foundation item: Hi-Tech Research and Development Program (No. 715-005-0040)
Biography of the first author: ZHANG Jun-hong, doctoral student, born in 1970, majoring in powder metallurgy.
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Zhang, Jh., Huang, By., He, Yh. et al. Physical simulation of hot deformation of TiAl based alloy. J Cent. South Univ. Technol. 9, 73–76 (2002). https://doi.org/10.1007/s11771-002-0045-8
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DOI: https://doi.org/10.1007/s11771-002-0045-8