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Glass-Forming Ability of an Iron-Based Alloy Enhanced by Co Addition and Evaluated by a New Criterion 下载免费PDF全文
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. 相似文献
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安徽省第三轮教师继续教育的主题为“五个好”,即“备好课”、“上好课”、“评好课”、“命好题”、“育好人”.目前已进入到第四个主题,“命好题”阶段.作为一名县级教研员,笔者参与了我县“命好题”阶段的准备工作,自然就关注到教师命题的情况,发现教师的命题现状不尽如人意,令人担忧. 相似文献
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