Abstract
In order to well understand the elementary mechanisms that govern the hot working process of a V–5Cr–5Ti alloy (mass fraction, %), thermal activation parameters under compression were measured in a temperature range of 1373–1673 K by a Gleeble–3800 system. The results show that the stress exponent n is 4.87 and the activation energy Q is 375.89 kJ/mol for the power law equation. The activation energy is determined as 288.34 kJ/mol, which is close to the self-diffusion energy of alloy (270–300 kJ/mol) by introducing a threshold stress(σ0) variable. The typical values of physical activation volume (Vp) and strain rate sensitivity (m) are measured as (120–700) b3 and 0.075–0.122, respectively, by the repeated stress relaxation tests. These activation parameters indicate that the rate controlling mechanism for V–5Cr–5Ti alloy compressed in ranges of 1373–1673 K and 0.001–1.0 s−1 is the dislocation climb by overcoming of forest dislocations.
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