Modeling of stress relaxation kinetics of amorphous Fe0.7Nb0.1Zr0.1Ti0.1 alloy powder: A novel approach based on differential thermal analysis.

In this study, the stress relaxation of amorphous Fe 0.7 Nb 0.1 Ti 0.1 Zr 0.1 alloy was investigated by differential thermal analysis (DTA) to enhance the soft magnetic properties. Amorphous Fe 0.7 Nb 0.1 Zr 0.1 T 0.1 alloy was produced by mechanical alloying technique using the mixture of pure elements and without adding metalloids. It was found that the stress relaxation process follows the Johnson-Mehl-Avrami model and the mechanism was volume diffusion control with three dimensional growth of the nuclei. The relation of stress relaxation progress (α), with time was proposed as: dα dt = β dα dT = 3.04 exp − 4312 RT 1 − α − ln 1 − α 0.37 . The final achieved microstructure leads to higher saturation magnetization and lower coercivity that are favorable for soft magnetic applications. [ABSTRACT FROM AUTHOR]