Abstract
The glass-forming ability (GFA) of the CuZr-based alloys with addition of equivalent atomic ratio of Ti and Al is investigated. We show that the addition of Ti and Al is effective to increase the GFA of the binary Cu50Zr50 alloy. As the content of Ti and Al increases from 0 to 10 at%, the GFA of the quaternary Cu-Zr-based alloys increases. The critical diameter of the Cu46Zr46Ti4Al4 and Cu45Zr45Ti5Al5 alloys is up to 6 mm. Moreover, we found that the critical diameter of a glassy rod is 7 mm for the Cu45:5Zr45:5Ti4:5Al4:5 alloy. The compositions of these alloys with high GFA are closer to a CuZrTiAl quaternary eutectic. However, much higher contents of Ti and Al lead to the precipitation of the simple TiAl phase, which degrades the GFA of the alloys. [doi:10.2320/matertrans.47.2804]
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