(Fe, Co)-(Hf, Nb)-B glassy thick sheet alloys prepared by a melt clamp forging method

Glassy Fe58Co14Hf8B20 and Fe60Co20Hf6Nb2B12 alloys in a thick sheet form were prepared by a meltclamp forging method. Their thickness was 0.78 nun 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.