Abstract
Glass forming ability (GFA), thermal stability and microhardness of Ni51−xCuxW31.6B17.4 (x = 0, 5) metallic glasses have been investigated. For each alloy, thin sheets of samples having thickness of 20 µm and 100 µm were synthesized by piston and anvil method in a vacuum arc furnace. Also, 400 µm thick samples of the alloys were synthesized by suction casting method. The samples were investigated by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Crystallization temperature of the base alloy, Ni51W31.6B17.4, is found to be 996 K and 5 at.% copper substitution for nickel increases the crystallization temperature to 1063 K, which is the highest value reported for Ni-based metallic glasses up to the present. In addition, critical casting thickness of alloy Ni51W31.6B17.4 is 100 µm and copper substitution does not have any effect on critical casting thickness of the alloys. Also, microhardness of the alloys are found to be around 1200 Hv, which is one of the highest microhardness values reported for a Ni-based metallic glass until now.
Highlights
For the last two decades, multicomponent bulk metallic glasses (BMGs) have attracted great attention because of their unusual physical, chemical and mechanical properties [1]
This is due to the fact that liquidus temperatures of the alloys investigated in this study are much lower than those of other refractory metal based metallic glasses
It is found that copper substitutions for nickel improves the glass transition and crystallization temperatures, which are comparable to those of other refractory metal based metallic glasses and higher than those of other Ni-based metallic glasses
Summary
For the last two decades, multicomponent bulk metallic glasses (BMGs) have attracted great attention because of their unusual physical, chemical and mechanical properties [1]. If a metallic glass alloy contains elements having high melting point, it is expected to have high crystallization temperature For this reason, number of metallic glass alloys containing high amount of refractory metals, such as tungsten, ruthenium, rhenium, iridium, osmium, tantalum and niobium, have been studied in order to develop metallic glasses having high crystallization temperatures [2,3,4,5,6,7,8,9,10]. Number of metallic glass alloys containing high amount of refractory metals, such as tungsten, ruthenium, rhenium, iridium, osmium, tantalum and niobium, have been studied in order to develop metallic glasses having high crystallization temperatures [2,3,4,5,6,7,8,9,10] In these studies, metallic glasses which have crystallization temperatures higher than 1100–1200 K have been developed. Examinations of the compositions of the refractory metal based metallic glasses show that most of these alloys contain high amount of boron in addition to refractory metals [2,3,4,5,6,7,8,9,10]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
