Abstract
Alloying addition, as a means of improving mechanical properties and saving on costs of materials, has been applied to a broad range of uses and products in the metallurgical fields. In the field of bulk metallic glasses (BMGs), alloying additions have also proven to play effective and important roles in promoting glass formation, enhancing thermal stability and improving plasticity of the materials. Here, we review the work on the role of alloying additions in glass formation and performance improvement of BMGs, with focus on our recent results of alloying additions in Pd-based BMGs.
Highlights
Metallic glasses are metallic solids, but different from conventional crystalline alloys in both structure and properties
There are metallic glasses that can be pushed beyond those few geometries and can be produced at a size greater than 1 mm in all three dimensions, they are termed bulk metallic glasses (BMGs)
Ni-Nb [16,17], Ca-Al [18], Cu-Zr [19,20,21,22], Pd-Si [23], Cu-Hf [24], Ti-Co [25] and Ni-Ta [26] alloys have been successfully synthesized. This means that even very simple alloys, if subjected to suitable production techniques, can be prepared in forms of BMGs. These binary alloys exhibited reduced glass forming ability (GFA) compared to those consisting of more constituents, which was evidenced by their relatively high critical cooling rates and smaller critical sizes for glass formation
Summary
Metallic glasses are metallic solids, but different from conventional crystalline alloys in both structure and properties. These binary alloys exhibited reduced glass forming ability (GFA) compared to those consisting of more constituents, which was evidenced by their relatively high critical cooling rates and smaller critical sizes for glass formation Based on these binary BMGs, new BMGs with much larger GFA can be designed through suitable alloying additions. The beneficial effects of alloying additions can mainly be summarized in two aspects: (1) Improving the GFA; and (2) enhancing the properties, including improving the thermal stability of the glassy structure, strengthening the BMGs, improving the ductility, improving the magnetic properties and corrosion-resistance, etc
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