Hydrogen-induced amorphization of Zr-Cu-Ni-Al alloy

Abstract

Male, born in 1984, Doctor. He has been working in the field of advanced metallic materials with amorphous/glassy structure and their composites. In particular, his research focuses on developing new bulk metallic glasses used as hydrogen penetrating materials and hydrogen storage materials. T he limited glass-forming ability (GFA) of metallic glass restricts its application as a structural material. Although many laboratories have reported the development of large-sized (in many cases, centimeterplus) bulk metallic glasses (BMGs), the actual number of alloys suitable for commercial production is quite low [1] . It is of considerable practical significance to enhance the GFA of existing BMG-forming alloys. For these alloy systems, the nature and number of components and purity of elements are critical factors in terms of GFA and mechanical properties [2] . The GFA and properties of BMGs are also quite sensitive to the material's composition. Therefore, minor alloying additions play an important role in the glass formation, thermal stability, and comprehensive properties of BMGs [3] .Various elements have been employed to change the Abstract: Arc melting was utilized in this study to produce Zr 55 Cu 30 Ni 5 Al 10 alloys under mixed atmospheres with various ratios of high-purity hydrogen to argon. The influences of hydrogen addition on the solidification structure and glass-forming ability of Zr 55 Cu 30 Ni 5 Al 10 alloy were determined by examining microstructures in different parts of the cast ingots. The results showed that different degrees of crystallization structures were obtained in the ascast button ingots after arc melting in high-purity Ar, and the cross-sectional solidification morphology of arcmelted ingots was found to consist of crystals with varying from the bottom up. By contrast, there were completely amorphous structures in the middle and upper areas of the as-cast button ingots fabricated by adding 10% H 2 to the high-purity Ar atmosphere. A clear solidification interface was found between the crystal and glass in the ascast button ingots, which indicates that hydrogen addition can enhance the Zr 55 Cu 30 Ni 5 Al 10 alloy's glass-forming ability. The precise mechanism responsible for this was also investigated.