OPTIMIZED COMPOSITIONS OF Ti-(Cu,Ni)-Sn ALLOY FOR METALLIC GLASS FORMATION AND THEIR CORRELATION WITH EUTECTIC REACTION
Ti-(Cu，Ni)-Sn合金形成金属玻璃的成分优化及其相关联的共晶反应

Adopting the “3D pinpointing approach”, compositional dependence of glass--forming ability (GFA) for Ti-(Cu1-xNix)-Sn (0.20≤x≤0.30, atomic fraction) quaternary alloys was systematically investigated. The alloy with the optimized GFA is located at Ti38Cu37.8Ni16.2Sn8. Its critical diameter for metallic glass formation is near 1.0 mm for the rods fabricated using Cu mold casting. This metallic glass exhibits the supercooled liquid region ΔTx of 56 K and the reduced glass transition temperature Trg of 0.57. By characterizing the microstructure of the arc-melted Ti38Cu37.8Ni16.2Sn8 alloy, it is indicated that solidification of the alloy melt undergoes a pseudo-binary eutectic reaction of L→Ti5Sn3Cu+TiCuNi.