کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1481949 | 991549 | 2012 | 5 صفحه PDF | دانلود رایگان |
The alloy system, Pd41.25Ni41.25P17.5, has a negative heat of mixing among its constituent elements. By using high resolution transmission electron microscopy, high angle annular dark field in scanning transmission mode, and energy dispersive X-ray spectroscopy, it was found that phase separation occurs in Pd41.25Ni41.25P17.5 glassy alloys. For a clear exhibition of the amorphous phase separation reaction, it is desirable to introduce intermediate thermal annealing before an undercooled Pd41.25Ni41.25P17.5 melt is cooled down to become a solid amorphous specimen. The results suggest that there may be unique short range orders in amorphous/liquid Pd41.25Ni41.25P17.5, which are responsible for the phase separation.
► Direct experimental observations of amorphous phase separation in Pd41.25Ni41.25P17.5.
► Experimental techniques including, DSC, HREM, HAADF, and EDX.
► An intermediate annealing process before glass formation is essential.
Journal: Journal of Non-Crystalline Solids - Volume 358, Issue 10, 15 May 2012, Pages 1298–1302