Crystallisation of as-quenched and hydrogenated amorphous Cu100-xTixalloys

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Abstract
Amorphous alloys of the composition Cu100-xTix (x=40, 50, 60) were prepared by rapid quenching from the melt. The crystallisation processes in these alloys were characterised by differential thermal analysis (DTA) measurements. The alloy with x=50 shows a single crystallisation process and forms the single crystalline compound CuTi. Alloys with x=40 and x=60 both show two crystallisation processes and precipitate two crystalline compounds, CuTi and Cu3Ti for x=40, and CuTi and CuTi2 for x=60. DTA measurements for electrolytically hydrogenated alloys all show an exothermic peak at approximately 400K, a cluster of several exothermic peaks beginning at around 700K and a large endothermic peak at approximately 950K. X-ray measurements of annealed samples indicated that the lowest-temperature peak results from a decrease in volume of the amorphous structure but no formation of crystalline phases. The cluster of peaks at around 700K results from the formation of Cu and TiH2 and the endothermic peak results from the breakdown of the hydride and the formation of resulting crystalline products similar to those of the non-hydrogenated alloys.