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A TEM study of the influence of Si on the precipitation processes of an Al-Cu-Mg-Ag alloy
No full textVacancy-solute aggregates in Al-Cu-Mg alloys studied by positron annihilation techniques
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Formation and evolution of the hardening precipitates in a Mg-Y-Nd alloy
No full textThe formation and evolution of hardening precipitates in a Mg-Y-Nd (WE43) alloy during artificial ageing at 150 and 210 °C is followed by small angle X-ray scattering (SAXS) measurements, Vickers microhardness tests and transmission electron microscopy (TEM) observations. A quantitative description of the alloy studied during the early and advanced stages of the precipitation sequence is presented. In situ SAXS evolution at 210 °C of the size, volume fraction and number density of the subnanometer and nanometer particles that evolve in the β′′ phase was obtained. TEM and microhardness results indicate that the hardening mechanism is based on β′′ transformation of pre-precipitates and their growth at 150 °C, while at 210 °C hardening is mainly associated with β′′ → β′ transformation
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