Glass-Forming Ability and Properties of New Au-Based Glassy Alloys with Low Au Concentrations

Abstract

Au 40 Si [17][18][19][20] Cu [28][29][30] Ag 5-7 Pd 5 glassy alloys showed a wide supercooled liquid region of 42-53 K and a large reduced glass transition temperature of 0.568-0.605, indicating high stabilization of supercooled liquid and high glass-forming ability (GFA). The best GFA was obtained from Au 40 Si 20 Cu 28 Ag 7 Pd 5 alloy, and a fully glassy sample with a diameter of 6 mm could be fabricated by copper mold casting. The bulk glassy alloys exhibited very low T g of 400-424 K, high fracture strength of over 1100 MPa, and corrosion resistance superior to SUS316L in 1 N H 2 SO 4 solution.

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

“…Encouraged by this success, with the effort of scholars all over the world, a number of Ti-based BMGs, such as Ti-Cu-Ni [40,41], Ti-Zr-Be [42,43], Ti-Zr-Cu-Ni-Sn [44,45], Ti-Zr-Cu-Pd-(Sn, Si, Nb) [46][47][48][49][50], Ti-Zr-Cu-Ni-Be [51][52][53], Ti-Zr-Hf-Cu-Ni-Si-Sn [54], and Ti-Cu-Zr-Fe-Sn-Si-(Ag, Sc) [55][56][57], have been developed over the last few decades. Figure 1 shows the maximum diameters for glass formation obtained in different alloy systems and the year in which they were discovered [8,[58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Compared with other alloy systems (e.g., Zr-, Pd-, Mg-, Fe-, Co-, Ni-, and Cu-based So far, the largest known critical diameter for Ti-based BMGs has been over 50 mm in the Ti-Zr-Cu-Ni-Be [72] and Ti-Zr-Cu-Fe-Be [73] quinary alloy systems.…”

“…Maximum diameters of the bulk metallic glass (BMG) rods achieved in different alloy systems and the years in which they were discovered. Data are taken from [8,[58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73].…”

A comparison of de-alloying crystalline and amorphous multicomponent Au alloys

“…The Au 40 Cu 28 Ag 7 Pd 5 Si 20 composition has been developed to improve the glass forming ability of Au-based glassy alloys [23]. Glass formation in these alloys is favoured by the negative enthalpy of mixing between the main components in the liquid state which implies the occurrence of short range order.…”

Microstructure and electrochemical properties of nanoporous gold produced by dealloying Au-based thin film nanoglass

“…%). This composition was selected for its high glass forming ability, among the highest for the Au-based alloys [21]. The master alloy was induction melted and the target was cast in a graphite mold at PX Services, La Chaux-de-Fonds (CH).…”