Soft magnetic ternary iron-boron-based bulk metallic glasses

Chih-Yuan Lin; Hung-Yu Tien; Tsung-Shune Chin
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p162501
Academic Journal
Ternary iron-boron-based bulk metallic glasses (BMGs) were explored exhibiting capability of thick amorphous casting at least 1 mm in rod diameter or 0.5 mm in plate thickness, excellent soft magnetic properties with saturation magnetization 1.56 T and coercivity smaller than 40 A/m, and electrical resistivity larger than 200 μΩ cm. The BMG alloys represented by the formulas MaFebBc are based on two simple selection rules: (1) M is an element with an atomic radius at least 130% that of Fe; (2) M possesses eutectic points with both Fe and B, and the M-Fe eutectic is at the Fe-rich end. Among more than 30 candidate M elements, Sc, Y, Dy, Ho, and Er fulfill BMG capability at the composition range, in at %, 3


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