(Fe, Co)-(Hf, Nb)-B Glassy Thick Sheet Alloys Prepared by a Melt Clamp Forging Method

Abstract

Glassy Fe₅₈Co₁₄Hf₈B₂₀ and Fe₆₀Co₂₀Hf₆Nb₂B₁₂ alloys in a thick sheet form were prepared by a meltclamp forging method. Their thickness was 0.78 mm and 0.49 mm, respectively. The glassy sheets have nearly the same values of glass transition temperature (T_g), onset temperature of crystallization (T_x) and Curie temperature (T_c) as those for the melt-spun ribbon samples. The T_g, T_x and T_c were 826 K, 895 K, and 598 K respectively for the Fe₅₈Co₁₄Hf₈B₂₀ alloy, and 799 K, 841 K and 638 K respectively for the Fe₆₀Co₂₀Hf₆Nb₂B₁₂ alloy. The same thermal properties between the forged and the melt-spun samples are presumably due to the formation of a similar glassy structure. The success of manufacturing Fe-based glassy thick sheets by the forging method is encouraging for future progress as a new engineering material.