Metallic glasses Tg Tx ΔTx Tl (at. %) (K) (K) (K) (K) Zr68Cu16-Ni7.5Al8.5 635 704 69 1213 0.523 0.381 < 2 Zr68Cu13Ni10.5Al8.5 625 701 76 1190 0.526 0.386 2.5 Zr68Cu10Ni13.5Al8.5 632 703 71 1198 0.528 0.384 2 Figure 6.2 displays the DSC and DTA curves of the Zr68Cu(16-x)Ni(7.5+x)Al8.5 (x=0, 3, 6) metallic glasees. Table 6.1 summarizes and as well as three common Dc, Tg, Tx Tl GFA indicators (ΔTx=Tx−Tg, and It can be observed that all the Trg= Tg/Tl Tx/(Tg+Tl)). γ= alloys display one endothermic peak related to glass transition, followed by two exothermic peaks due to crystallization. The increases from 69 K to 76 K with decreasing Cu content ΔTx from 16 at.% to 13 at.%. With further decreases in Cu content to 10 at.%, the decreases ΔTx to 71 K. The parameter also shows the same trend as that of Thus, all of the indicators γ ΔTx. for the Zr68Cu16-Ni7.5Al8.5 glassy alloy exhibit the lowest among the alloy series, confirming the poorest GFA of this alloy composition. Although the Zr68Cu13Ni10.5Al8.5 glassy alloy does not exhibit the highest it has the largest and parameter, which Trg, ΔTx γ indicates that it is the best glass-forming composition. It can be concluded that the high GFA, characterized by critical size is well reflected by the higher and values. Since the dc, ΔTx γ Zr68Cu13Ni10.5Al8.5 alloy shows the best GFA, we will focus on its thermal, kinetic and mechanical properties in the following section.
Metallic glasses Tg Tx ΔTx Tl (at. %) (K) (K) (K) (K) Zr68Cu16-Ni7.5Al8.5 635 704 69 1213 0.523 0.381 < 2 Zr68Cu13Ni10.5Al8.5 625 701 76 1190 0.526 0.386 2.5 Zr68Cu10Ni13.5Al8.5 632 703 71 1198 0.528 0.384 2 Figure 6.2 displays the DSC and DTA curves of the Zr68Cu(16-x)Ni(7.5+x)Al8.5 (x=0, 3, 6) metallic glasees. Table 6.1 summarizes Dc, Tg, Tx and Tl as well as three common GFA indicators (ΔTx=Tx−Tg, Trg= Tg/Tl and γ= Tx/(Tg+Tl)). It can be observed that all the alloys display one endothermic peak related to glass transition, followed by two exothermic peaks due to crystallization. The ΔTx increases from 69 K to 76 K with decreasing Cu content from 16 at.% to 13 at.%. With further decreases in Cu content to 10 at.%, the ΔTx decreases to 71 K. The γ parameter also shows the same trend as that of ΔTx. Thus, all of the indicators for the Zr68Cu16-Ni7.5Al8.5 glassy alloy exhibit the lowest among the alloy series, confirming the poorest GFA of this alloy composition. Although the Zr68Cu13Ni10.5Al8.5 glassy alloy does not exhibit the highest Trg, it has the largest ΔTx and γ parameter, which indicates that it is the best glass-forming composition. It can be concluded that the high GFA, characterized by critical size dc, is well reflected by the higher ΔTx and γ values. Since the Zr68Cu13Ni10.5Al8.5 alloy shows the best GFA, we will focus on its thermal, kinetic and mechanical properties in the following section.
Shuang%20thesis.docx