Synthesis, thermal stability and properties of [(Fe1−xCox)72Mo4B24]94Dy6 bulk metallic glasses |
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Authors: | Shan Tao Zubair AhmadHong Jian Tianyu MaMi Yan |
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Affiliation: | a State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China b Institute of Fair Friend Electromechanics Engineering, Hangzhou Vocational & Technical College, Hangzhou, 310018, China |
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Abstract: | A series of (Fe1−xCox)72Mo4B24]94Dy6 (x = 0.1, 0.2, 0.3, 0.4 and 0.5 at.%) bulk metallic glasses (BMGs) in rod geometries with critical diameter up to 3 mm were fabricated by copper mold casting method. This alloy system exhibited good thermal stability with high glass transition temperature (Tg) 860 K and crystallization temperature (Tx) 945 K. The addition of Co was found to be effective in adjusting the alloy composition deeper to eutectic, leading to lower liquidus temperature (Tl). The (Fe0.8Co0.2)72Mo4B24]94Dy6 alloy showed the largest supercooled liquid region (ΔTx = Tx − Tg = 92 K), reduced glass transition temperature (Trg = Tg/Tl = 0.622) and gamma parameter (γ = Tx/(Tg + Tl) = 0.424) among the present system. Maximum compressive fracture strength of 3540 MPa and micro-Vickers hardness of 1185 kg/mm2 was achieved, resulting from the strong bonding structure among the alloy constituents. The alloy system possessed soft magnetic properties with high saturation magnetization of 56.61-61.78 A m2/kg and coercivity in the range of 222-264.2 A/m, which might be suitable for application in power electronics devices. |
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Keywords: | Bulk metallic glass Glass forming ability Thermal stability Soft magnetic property |
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