2007 Volume 48 Issue 7 Pages 1789-1792
The glass-forming ability (GFA) and thermal stability of (Zr65Al7.5Cu27.5)100−xTix (x=0∼15; in at%) alloys have been investigated. It was revealed that a certain amount of Ti addition could improve the GFA of Zr65Al7.5Cu27.5 alloy effectively. The best bulk metallic glass (BMG) forming composition was found at (Zr65Al7.5Cu27.5)93Ti7. Bulk glassy samples with diameter of 7 mm were made by means of copper mold casting. Further Ti additions deteriorated GFA and led to the precipitation of icosahedral phase, and 3 mm quasicrystalline cylinder was obtained at (Zr65Al7.5Cu27.5)90Ti10. Room temperature compression testing showed that the quasicrystalline alloy had a fracture strength of 1875 MPa, being 300 MPa larger than that of the (Zr65Al7.5Cu27.5)93Ti7 monolithic BMG.