Effect of deformation and cooling on non-equilibrium microstructure evolution and phase-transition mechanism of Ti–6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si
Year: 2024
Type: article
Abstract: In the process of non-isothermal deformation of titanium alloy, the microstructure evolution is very complicated, which has direct effects on the properties of titanium alloy. In this study, the effects of pure cooling and coupled deformation and cooling at the initial temperature of 940℃ and the cooling rate of 5,50℃/s, and the strain rate of 0.1,10s-1 respectively, on the microstructure evolution of Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si alloy (TC6) were studied. The microstructure after cooling was characterized, and the mechanism of non-isothermal deformation on microstructure evolution and the mechanism of secondary α phase (αs) precipitation were revealed. Results show that the secondary α phase precipitated in large quantities after cooling to a certain temperature, and the secondary precipitated has obvious inhibition effect on the diffusion growth of the primary α phase (αp). Secondary α phases can be divided into lamellar and equiaxial types. When the temperature drops sharply, the fine secondary α phase can be precipitated directly from β matrix. Due to the large number of dislocations generated by deformation, many small secondary α phases can be generated during the rapid cooling process. The orientation relationship between α phase and β matrix is destroyed due to deformation, which leads to the weakening of anisotropy, so that the secondary α phase remains equiaxial during the precipitation process.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,430
OpenAlex ID: W4404095700