Ductile titanium-based glassy alloy ingots

Abstract

We report that ductile and strong amorphous titanium metallic alloys (∼ twice the strength of high-strength titanium alloys) have been discovered that are in the form of glassy ingots. It is found that the suppression of a competing stable quasicrystalline phase upon solidification is particularly important in forming the current glassy ingots. While there is significant technological potential for these titanium alloys, the present findings have important implications on the design of highly processable bulk metallic glasses.

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

“…However, there are contrary examples. According to Guo et al's research [52], the optimum Ni content in the Ti 40 Zr 25 Cu 15−x Ni x Be 20 system is no more than 3 atom %. Moreover, the GFA of Ti-Zr-Cu-Pd BMG can be markedly improved by the addition of only 1 atom % Co, and the critical diameter is increased from 3 mm to 5 mm [117].…”

“…In 1998, the first Ti-based BMG was successfully prepared by a copper mold casting in a Ti-Cu-Ni-Sn alloy system [39]. 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].…”

“…In this section, we will focus on the effect of alloying on the GFA of Ti-based BMGs. Table 3 summarizes the effects of different alloying elements on the thermal stability (reflected by ∆Tx) and GFA of Ti-based BMGs [39,49,52,54,57,79,87,[90][91][92]99,[105][106][107][108]110,117,[125][126][127][128][129][130]. …”

Structural relaxation of Ti40Zr25Ni8Cu9Be18 bulk metallic glass

“…Ti-based bulk metallic glasses (BMGs), as promising lightweight structural materials, have attracted more and more attention during recent years [3][4][5][6][7][8][9][10][11][12]. Ti 40 Zr 25 Ni 8 Cu 9 Be 18 BMG, as one of the best Ti-based BMGs known today, was found to exhibit a good combination of glass forming ability (GFA, the maximum diameter could be 8 mm) and mechanical properties (high compressive strength and large compressive plastic strain) [9,13,14], which could be a potential structural material.…”

Formation and Thermal Stability of Cu<SUB>46.25</SUB>Zr<SUB>44.25</SUB>Al<SUB>7.5</SUB>Er<SUB>2</SUB> Bulk Metallic Glass with a Diameter of 12 mm

“…In the past decades, a number of BMGs with maximum diameter of at least 10 mm have been synthesized in many multi-component alloy systems. [1][2][3][4][5][6] Among the bulk glassforming alloys, Cu-based BMGs were recognized to be a promising structural materials due to relatively high strength, good ductility and low cost, and the maximum diameter is reported to be 10 mm for Cu 46 Zr 42 Al 7 Y 5 and Cu 44:25 Ag 14:75 -Zr 36 Ti 5 alloys. 2,7) It is well known that binary Cu 50 Zr 50 alloy has a good glass-forming ability (GFA).…”