Glass-forming ability of bulk Pd40Ni10Cu30P20 alloy

DOI Web Site 被引用文献29件 参考文献26件

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  • Glass-Forming Ability of Bulk Pd<SUB>40</SUB>Ni<SUB>10</SUB>Cu<SUB>30</SUB>P<SUB>20</SUB> Alloy

説明

The partial replacement of Ni by 30 at%Cu for the Pd40Ni40−xCuxP20 alloys was found to cause the drastic increase in the glass-forming ability as is evidenced from the decrease in the critical cooling rate for glass formation (Rc) to 1.5 K/s and the increase in the critical sample thickness for glass formation (tmax) to 40 mm. The Pd40Ni10Cu30P20 amorphous alloy exhibits the distinct glass transition, followed by the appearance of a wide supercooled liquid region (ΔTx(=Tx−Tg)) reaching 95 K and then a single-stage crystallization. The differential thermal analysis indicates that the Pd–Ni–Cu–P alloy has a single stage melting reaction at 804 K. The resulting Tg⁄Tm is measured to be as high as 0.72. Considering that the Rc, tmax, ΔTx and Tg⁄Tm are 128 K/s, about 7 mm, 63 K and 0.66, respectively, for a Pd40Ni40P20 amorphous alloy with the largest glass-forming ability in previously reported Pd-based alloys, the present new Pd–Ni–Cu–P amorphous alloy is concluded to have a much larger glass-forming ability and a higher thermal stability of the supercooled liquid. The crystallization occurs through a single stage due to the precipitation of more than four kinds of crystalline phases and hence the necessity of long-range rearrangement of the constituent elements for the progress of the precipitation seems to cause the large glass-forming ability and the high thermal stability of the supercooled liquid through the retardation of crystallization. The finding of the new Pd-based amorphous alloy with the much larger glass-forming ability is important for the future development of basic science and engineering application of amorphous alloys.

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