Thermal Analysis of the Effect of Oxygen Contamination on Undercooling of Zr-Al-Ni-Cu, Cu-Zr-Ti, and Cu-Ni-Zr-Ti Metallic Glasses (Preprint)

摘要

Oxygen impurity levels have been varied in Zr65Al7.5(Cu17.5Ni10), Cu60Zr30Ti10, and (Cu47Ni8)Zr11Ti34 glass forming alloys, and their effect has been characterized by differential scanning calorimetry and x-ray diffraction. Results indicate that these alloys exhibit varying amounts of sensitivity to oxygen. In Zr65A17.5(Cu17.5Ni10)change in Tx decreases dramatically from over 100K to 55K when 1.0 at% oxygen is added; in (Cu47Ni8)Zr11Ti34, change in Tx remains relatively constant at 45K up to 1.2 at% oxygen; in Cu60Zr30Ti10, change in Tx first increases from 31K to 38K as oxygen concentration increases for 0.32 to 0.80 at%, and then change in Tx decreases again at higher oxygen levels. These results indicate that oxygen addition to some amorphous metal compositions could be regarded as a beneficial alloying element to improve thermal stability.