Glass-Forming Ability of an Iron-Based Alloy Enhanced by Co Addition and Evaluated by a New Criterion |
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作者姓名: | 陈庆军 沈军 范洪波 孙剑飞 黄永江 MCCARTNEYD.G. |
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作者单位: | [1]SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001 [2]SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001//SchoolofMechanical,MaterialsandManufacturingEngineering,UniversityofNottingham,UniversityPark,NottinghamNG72RD,UK [3]SchoolofMechanical,MaterialsandManufacturingEngineering,UniversityofNottingham,UniversityPark,NottinghamNG72RD,UK |
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摘 要: | A new Fe-based alloy that can be cast into a fully amorphous rod with a diameter of at least 16mm by the conventional copper-mould casting technique is obtained by partially replacing Fe with Co in a previously reported Fe-based bulk metallic glass. The preliminary thermodynamic analysis indicates that the Co-containing alloy has a significantly lower Gibbs free energy difference between the undercooled melt and the corresponding crystalline solid, compared to the Co-free alloy, reflecting the dramatic role of the Co addition in stabilizing the supercooled melt and facilitating glass formation in iron-based alloys. Here, a new criterion, derived from the classical nucleation and growth theory, is introduced to evaluate the glass-forming ability of Fe-based bulk metallic glasses.
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关 键 词: | 玻璃成型 离子铁基合金加固 钴 热力学计算 |
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