Zr–(Cu,Ag)–Al bulk metallic glasses

Abstract

In this paper, we report the formation of a series Zr-(Cu,Ag)-Al bulk metallic glasses (BMGs) with diameters at least 20 mm and demonstrate the formation of about 25 g amorphous metallic ingots in a wide Zr-(Cu,Ag)-Al composition range using a conventional arc-melting machine. The origin of high glass-forming ability (GFA) of the Zr-(Cu,Ag)-Al alloy system has been investigated from the structural, thermodynamic and kinetic points of view. The high GFA of the Zr-(Cu,Ag)-Al system is attributed to denser local atomic packing and the smaller difference in Gibbs free energy between amorphous and crystalline phases. The thermal, mechanical and corrosion properties, as well as elastic constants for the newly developed Zr-(Cu,Ag)-Al BMGs, are also presented. These newly developed Ni-free Zr-(Cu,Ag)-Al BMGs exhibit excellent combined properties: strong GFA, high strength, high compressive plasticity, cheap and non-toxic raw materials and biocompatible property, as compared with other BMGs, leading to their potential industrial applications.

Effect of Ag addition on the thermal stability and glass-forming ability of Zr35Ti30Cu7.5Be27.5 bulk metallic glass

“…It has been found that microalloying with proper alloying elements can dramatically improve the GFA of various BMGs [23][24][25]. Previous studies showed that the GFA of Cu-, Mg-and ZrCu-based bulk metallic glasses were significantly enhanced by adding Ag [26][27][28][29]. In this work, Ag was also chosen as the doping element in the Zr 35 Ti 30 Cu 7.5 Be 27.5 system, which had a critical diameter of about 15 mm and a wide supercooled liquid region of 165.1 K [30].…”

“…From Figure 1(b), the best GFA was achieved for x = 1, which has a critical diameter of 20 mm. The enhanced GFA can probably be attributed to a denser local atomic packing and smaller differences in the Gibbs free energy between the amorphous and crystalline phases [29]. Therefore, the GFA of the Zr 35−x Ti 30 Cu 7.5 Be 27.5 Ag x (x=0-10) are x = 1x = 0x = 2x = 3x = 5x = 7x = 10.…”

Coincidence of collective relaxation anomaly and specific heat peak in a bulk metallic glass-forming liquid

“…Recent interests in Copper and Zirconium based glassy alloys are driven by their high glassforming abilities [9][10][11][12][13][14] . Experimentally, the most common method to manufacture a metallic glass is by quenching the molten metallic liquid through the glass transition.…”

Development of Ni- and Cu-Free Zr-Based Bulk Metallic Glasses for Biomedical Applications

“…In fact, over the past two decades, many Zr-based BMGs with the formula Zr-Al-TM have been successfully developed. 3,5,[10][11][12][13][14][15] The quaternary alloys in this system are summarized in Fig. 1; the elements linked with a solid line in the rectangular box represent the transition metals in the pre-existing quaternary alloys.…”