Formation and effect of topologically close-packed phases in nickel-base superalloys скачать в хорошем качестве

Formation and effect of topologically close-packed phases in nickel-base superalloys

A lecture given by Alison Wilson of the University of Cambridge, Materials Science and Metallurgy, for the 2016 Literature Review Prize of the Institute of Materials, Minerals and Mining (London). The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy’s susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy’s mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γ′ rafting behaviour. The Materials Literature Review Prize of IOM3 aims to encourage the preparation of definitive, critical reviews of the literature by students as an essential part of study for a higher degree in the materials field, and subsequently make the best of these available to a wider readership. The prize is administered by the Editorial Board of MST (the journal Materials Science and Technology). Open to any postgraduate student studying in the UK or internationally, the prize carries a cash award, in line with other IOM3 prizes for papers. A winning entry and two runner-up prizes are awarded each year, and all entries are considered for publication in the journal subject to acceptance following peer-review. Congratulations to Ilija Rašovic from the University of Oxford, UK, who won the 2016 prize with his review Water-soluble fullerenes for medical applications. Ilija commented, ‘My research in materials science is a bit left-field… what I have tried to propose with my literature review is the multiple benefits that fullerenes have in medical applications. There are plenty that have been shown to be useful and better than what is currently available in clinic. They obviously won’t all come to fruition, but there are certain areas where they should, and where they will.’ http://www.iom3.org/news/2016/jul/05/...