Effect of Directional Solidification Rate on Preferred Orientation, Microstructure and Magnetostriction of (Tb0.3Dy0.7)Fe1.95 Alloys

概要

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The effect of solidification rate on the preferred orientation, microstructure and magnetostriction of (Tb0.3Dy0.7)Fe1.95 alloys was investigated using a new “one-step” process. The functional relation between the crystal growth rate and the traction velocity was determined by the analysis of heat transfer. Results demonstrate that the crystal grows synchronously with the traction velocity as the traction velocity $U\leq 360$ mm/h. When the thermal gradient $G_{\text{L}}\approx 100$°C/cm and the solidification rate $V=70$ mm/h, samples with a $\langle 110\rangle$ preferred orientation can be obtained. Samples with the $\langle 110\rangle$ preferred orientation show a large low-field magnetostriction and an apparent compressive stress effect. With an increase in solidification rate, the crystal growth mode will transform gradually from the cellular and primary dendrite morphology into the developed dendrite morphology. Crystals growing in the cellular morphology have a $\langle 110\rangle$ preferred orientation. In the primary dendrite, the preferred orientation is $\langle 113\rangle$. However, a poor magnetostrictive performance and failed preferred orientation are observed in the developed dendrite.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-12-15