Glass Forming Ability of Metallic Glasses Evaluated by a New Criterion

The glass-forming ability （GFA） of Cu-Zr binary alloys is evaluated using the existing criteria based on calorimetric parameters, and poor relations are found. Therefore, another parameter Tτκ defined as Tκ/Tl, in which Tκ is the Kauzmann temperature and Tl the equilibrium liquidus temperature, is proposed. It exhibits good agreements with the experimental data of the Cu-Zr system and other representative bulk metallic glass formers so long as classifying them into strong or fragile category. It is suggested that kinetic effects are irrelevantly incorporated in the GFA analysis in the previous work.     

钒,铬对快速凝固Al-Ti-Fe合金的组织结构与显微硬度的影响

利用X射线衍射(XRD)和透射电镜(TEM)研究了V, CrAl-Ti-Fe合金组织及显微硬度的影响. 结果表明 Al-Ti-Fe-(V,Cr)合金急冷态组织均为过饱和Al基固溶体; 300 ℃×10 h处理后, Al-2.5Ti-2.5Fe-2.5Cr合金析出Al3Ti和Al13Cr2相; 400 ℃×10 h处理后, Al-Ti-Fe-(V,Cr)合金均析出Al13Fe4相.随退火温度的升高, 快速凝固Al-2.5Ti-2.5Fe-2.5V合金的显微硬度略有下降, 快速凝固Al-2.5Ti-2.5Fe-2.5Cr合金的显微硬度略有上升,表明V, Cr元素的加入有利于快凝Al-2.5Ti-2.5Fe合金显微硬度的增加.