The fluidity and molding ability of glass-forming Zr-based alloy melt

Abstract

The fluidity and filling ability of glass-forming Zr-based alloy melt in copper mould were investigated both theoretically and experimentally. The major factors which affected the flowing behavior of the metallic melt in the mold were determined, which provides the foundation for overcoming the contradiction between the filling and formation of amorphous alloy during the rapid cooling process of the metallic melts. The casting factors to prepare a metallic ring were discussed and selected. As a result, a Zr-based bulk metallic glass ring was prepared successfully.Zr-based bulk metallic glass, casting, fluidity, moldingThe earliest amorphous alloy was discovered in the 1960s by quenching Ag 80 Si 20 melt [1] . Due to the limitation of the cooling rate, amorphous alloys can only be made in the form of ribbons and powders which limit the application severely in the earlier years. Since the discovery of La-based and Zr-based bulk metallic glass (BMG) systems [2][3][4][5] by Inoue and Johnson respectively, the limitation of cooling rate was broken up. Later, the Pb 40 Cu 30 Ni 10 P 20 bulk amorphous alloy with a thickness of 72 mm was made by replacing Ni in Pb 40 Ni 40 P 20 by 30% Cu in Inoue's group [6] . The critical cooling rate was measured to be only about 0.33 K/s by Johnson's group [7] . The above mentioned research tremendously contributed to the preparation of BMGs in a large size.Due to the special structure of BMGs, BMGs have different properties from conventional crystalline alloys, such as high strength, high hardness, high elastic limitation and high fracture toughness, and superplasticity in a supercooled liquid region. Meanwhile, BMGs also have other favorable properties such as wear resistance, corrosion resistance, radialization resistance and antioxidation. These properties attract extensive attention in the metallic materials field [8][9][10] . In

Effect of Pulse Frequency on Phase Composition and Properties of Amorphous Zirconium Alloy Micro-arc Oxidation Coating

“…In the amorphous alloy system, due to the glass forming ability of the zirconium-based amorphous alloy [1]. The large supercooled liquid region, and the excellent mechanical properties [2], it has attracted the attention of the materials staff [3][4][5][6]. At present, the research of amorphous alloys has become a research hotspot in the field of materials science.…”

Temperature rise and flow of Zr-based bulk metallic glasses under high shearing stress

“…With the characteristics of high strength, high hardness, excellent wear resistance, and good elasticity, bulk metallic glasses (BMGs) are envisaged to have a wide range of functional and structural applications [1][2][3]. Because of the lack of the effective plastic deformation at room temperature, BMGs are restricted in practical applications.…”

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

“…A considerable number of studies related to the structural relaxation [4][5][6][7][8], fluidity and molding ability [9], corrosion behavior [10,11] and mechanical properties [12][13][14][15] of BMGs have been carried out, which contributes to the application of BMGs. However, the potential applications of BMGs are hindered by their limited glass forming ability (GFA).…”