Thermal stability, magnetic and mechanical properties of Fe-Dy-B-Nb bulk metallic glasses with high glass-forming ability

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• 作者：Jiawei Li ; Weiming Yang ; Diana Est茅vez ; Guoxin Chen ; Wenguang Zhao ; Qikui Man ; Yuanyun Zhao ; Zhidong Zhang ; Baolong Shen
• 关键词：B. Glasses ; metallic ; B. Thermal stability ; B. Phase transformation ; B. Mechanical properties at ambient temperature ; B. Magnetic properties
• 刊名：Intermetallics
• 出版年：March, 2014
• 年：2014
• 卷：46
• 期：Complete
• 页码：85-90
• 全文大小：1895 K

文摘

The effects of Dy addition on the thermal stability, glass-forming ability (GFA), magnetic and mechanical properties of quaternary (Fe_0.76鈭?em>xDy_xB_0.24)₉₆Nb₄ (x聽=聽0-0.07) bulk metallic glasses (BMGs) were investigated. Increasing Dy content from x聽=聽0 to 0.05 extended the supercooled liquid region up to 112聽K, allowing the fabrication by copper mold casting of BMGs rods with 5.5聽mm in diameter. The high GFA was found to be related to the structure of primary crystalline phase. For the x聽=聽0.05 alloy, the competitive formation process of the complex Fe₂₃B₆ and Dy₂Fe₁₄B phases enabled to obtain the largest GFA value. Moreover, the Fe-Dy-B-Nb BMGs exhibited good soft-magnetic properties, i.e., high saturation magnetization of 1.18-0.56聽T and low coercive force of 1.9-21.6聽A/m. In addition, the glassy alloy rods also showed high compressive fracture strengths of 4400-4150聽MPa and high Vickers hardness of 1110-1090聽kg/mm².