Abstract
Metallic glassy alloys with their short-range order have received considerable attention since their discovery in 1960’s. The worldwide interest in metallic glassy alloys is attributed to their unique mechanical, physical, and chemical properties, which cannot be found together in long-range order alloys of the same compositions. Traditional preparation methods of metallic glasses, such as rapid solidification of melts, always restrict the formation of glassy alloys with large atomic fraction (above 3–5 at%) of high melting point metals (Ta, Mo, W). In this study, (Zr67Cu33)100−xWx(x; 5–30 at%) metallic glassy alloys were fabricated through a mechanical alloying approach, which starts from the elemental powders. This system shows excellent glass forming ability in a wide range of W (0 ≤ x ≥ 30 at%). We have proposed a spark plasma sintering technique to prepare nearly full-dense large sized (20 × 20 mm) bulk metallic glassy alloys. The as-consolidated bulk metallic glassy alloys were seen to possess high thermal stability when compared with the other metallic glassy systems. This is implied by their high glass transition temperature (722–735 K), wide range of supercooled liquid region (39 K to over 100 K), and high values of crystallization temperature (761 K to 823 K). In addition, the fabricated ternary systems have revealed high microhardness values.
Highlights
This is implied by their high glass transition temperature (722–735 K), wide range of supercooled liquid region (39 K to over 100 K), and high values of crystallization temperature (761 K to 823 K)
Metallic glassy alloys, which are solid materials that consist of metallic atoms arranged in a random manner with no obvious long-range order fashion, have seen enormous development during recent years [1]
The term glass is nowadays almost unanimously used for an amorphous substance, which can be obtained through different ways of preparations, in rapid solidification from the melts [2]
Summary
Metallic glassy alloys, which are solid materials that consist of metallic atoms arranged in a random manner with no obvious long-range order fashion, have seen enormous development during recent years [1]. The world of materials science included this type of promising materials among the high-tech advanced materials since 1960, following the pioneering discovery by Duwez and coworkers [2]. With reference to their unique physical, chemical, and mechanical properties [3], bulk metallic glasses (BMG) have attracted numerous number of researchers of different schools [4,5,6,7]. BMG possesses desirable properties that are quite different from the corresponding long-range order materials with the same composition [8,9,10,11,12,13,14,15]. The melt spinning process, conducted by rapid cooling rate that reaches to 106 K/s of molten metal alloy, cannot be employed for those
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