کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1610380 | 1516275 | 2015 | 8 صفحه PDF | دانلود رایگان |
• Glass formation in the Ti–Cu system was predicted by two amorphization criteria.
• Minor amounts of Si were added to the best glass former predicted, Cu54Ti46.
• Good correlation was found between the experimental results and the prediction.
• An optimum glass-forming ability occurs with addition of 1 at.% Si.
• Si additions decrease the liquidus temperature and induce precipitation of Ti5Si3.
The glass formation in the Ti–Cu system is revisited by means of the predictive γ* and λ + Δh1/2 amorphization criteria. Rapidly solidified ribbons of six selected compositions were investigated and in order to improve the glass-forming ability (GFA) minor amounts of Si were added to the best glass former predicted, Cu54Ti46. A series of (Cu0.54Ti0.46)100−xSix (x = 0.5, 1, 2) ribbons and rods with a diameter of 1 mm were prepared and analysed regarding their phase formation and thermal stability. For the alloy with the maximum GFA, (Cu0.54Ti0.46)99Si1, the critical diameter for glass formation is below 1 mm. Nevertheless, a good correlation was found between the experimentally determined GFA of the alloys and the prediction given by the λ+(Δh)1/2 and γ* criteria. The addition of Si decreases the liquidus temperature and promotes the precipitation of the Cu4Ti3 phase instead of γ-TiCu.
Journal: Journal of Alloys and Compounds - Volume 618, 5 January 2015, Pages 413–420