Glass-Forming Ability and Mechanical Properties of the Ternary Cu-Zr-Al and Quaternary Cu-Zr-Al-Ag Bulk Metallic Glasses

Abstract

The effects of addition of Al and equivalent atomic ratio of Ag and Al on the glass-forming ability (GFA)

Fabrication of New Cu<SUB>34</SUB>Pd<SUB>2</SUB>Zr<SUB>48</SUB>Ag<SUB>8</SUB>Al<SUB>8</SUB> Bulk Glassy Alloy with a Diameter of 30 mm

“…1) It has been reported that BMGs with critical diameters from 3 to 8 mm can be obtained in cast ternary Cu-Zr-Al alloys. 8,17) The high GFA of the ternary Cu-Zr-Al alloys was suggested to result from the formation of a unique glassy structure with highly dense random packing owing to negative heats of mixing and large atomic size mismatches among the constituent elements. 8) Recently we have reported that the Cu 36 Zr 48 Al 8 Ag 8 alloy exhibits an unusual GFA and its critical diameter for glass-formation reaches 25 mm.…”

Improvement of Glass Forming Ability of Cu-Ni-Zr-Ti Alloys by Substitution of Hf and Nb

“…The parameter T rg does not sufficiently account for the enhanced GFA, which is similar to the BMGs reported in the Ref. 18,19). Specifically, the multi component alloys except for the Cu-Zr alloy seem to have one solidus temperature around 1104 K which is lower than that of the Cu-Zr alloy.…”

Glass-Forming Ability and Early Crystallization Kinetics of Novel Cu-Zr-Al-Co Bulk Metallic Glasses

“…Accordingly, the glass transition temperature (T g ) and the onset temperature of crystallization (T x ) together with the liquidus temperature (T L ) for the investigated samples can be obtained (Table 1). Previous results have shown that the critical thickness of the fully amorphous phase for the (Cu 0.5 Zr 0.5 ) 90 Al 10 BMGs is less than 6 mm [48], whose T g , T x , T L , and γ are about 714 K, 787 K, 1230 K, and 0.406, respectively. Meanwhile, the values of γ for the Cu 50−x Zr 50 Co x (x = 0, 0.5, 2, 4, 5, 7.5, 10, 15, and 20 at.…”

“…As listed in Table 1, the widths of the supercooled liquid region (∆T rg = T x − T g ) for the (Cu 0.5 Zr 0.5 ) 90−x Al 10 Co x (x = 4, 5, and 6 at. %) BMGs, which is usually used to estimate the stability of the supercooled liquid against crystallization [49], were calculated to be larger than 55 K. This means that the thermal stabilities of the supercooled liquids are higher than those of Cu-Zr-(Co) metallic glasses but lower than that of (Cu 0.5 Zr 0.5 ) 90 Al 10 BMG (i.e., 77 ± 5 [48]). Such facts further confirm the change tendency of the GFA mentioned above.…”