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Effect of homogenisation conditions on recrystallisation in the Al-Mg-Mn alloy AA5454
No full textThe purpose of the present work is to understand the microstructure development and, particularly, to control the progress of recrystallisation in hot strip in the Al-Mg-Mn alloy AA 5454, which is typically used for the manufacture of structural automotive components. The chemical composition, together with the thermomechanical processing history of this material, has a strong influence on the microstructure of the product and the resulting properties as it is supplied to the customer. Electrical conductivity measurements, thermal analysis and electron microscopy have been carried out to characterise the evolution of precipitation state at various stages in the processing route. The conditions of the homogenisation heat treatment have been varied, and the effect on subsequent recrystallisation after hot rolling has been evaluated in both the as cast and rough rolled condition by optical microscopy techniques. Results indicate that the conditions of homogenisation heat treatment and roughing rolling are critical for the generation of a suitable recrystallised microstructure in AA 5454 hot strip. A new two stage homogenisation practice has been developed to expedite post-rolling recrystallisation in this alloy
Block Card 5454 Asta Court
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Ranch Style | 5454 Asta Court (Toledo, Ohio) | Dwelling | Evergreen Place Addition (Toledo, Ohio) | Wernerts Corners (Toledo, Ohio) | Trilby Area (Toledo, Ohio)
Block Card 5454 Lewis Avenue
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Dwelling | 5454 Lewis Avenue (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | North Toledo Area (Toledo, Ohio) | Ranch houses | Hipped roo
Block Card 5454 Bennett Road
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: dwelling | 5454 Bennett Road (Toledo, Ohio) | Ranch houses | North Toledo (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | Westview Par
Microstructure characterization of Al-alloy AW 5454 intended for ecological laser hybrid welding
Get PDFThis article presents the microstructure characterization of Al-alloy AW 5454, which is intended for laser hybrid welding. In the first part, the procedure of laser hybrid welding is described and compared to other laser surface modification techniques. Subsequently, key methods of metallographic characterization and hardness measurements at selected locations of Al-alloy AW 5454 are presented, enabling a scientific evaluation of the obtained results. The goal of the research was to gain insight into the microstructure of Al-alloy AW 5454, which will, in the future, make it possible to determine the technological parameters of laser hybrid welding that have the greatest influence on the final microstructure and, consequently, on the properties of the weld
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Asimetrično valjanje aluminijeve zlitine EN AW-5454
Get PDFRolling is as one of the most commonly used metal forming processes. In industrial practice,
symmetric rolling technology is usually used. Nevertheless, it is possible to conduct an
asymmetric rolling process. Introducing asymmetry in the rolling process is possible via
different means. Asymmetry imparts changes in the technical and in the economical aspect of
the rolling process.
In the framework of this master thesis, the asymmetric rolling of EN AW-5454 aluminium
alloy was investigated. For the planned rolling types, numerical simulations with similar
conditions and entry rolling parameters were conducted. Symmetric and asymmetric rolling
experiments were performed on a laboratory rolling mill and the exit obtained parameters
were compared. The deformed workpieces were heat-treated and annealed. Different
mechanical tests were performed on both the heat-treated and the deformed samples to find
out the influence of asymmetric rolling on the resulting properties. Tensile, plastic strain ratio
and hardness tests were performed respectively. Standard sample preparation procedures were
applied to the samples subjects. Investigations of light optical and scanning electron
metallography were carried out.Proces valjanja je eden najpogosteje uporabljenih postopkov preoblikovanja kovinskih
materialov. V praksi se najpogosteje uporablja postopek simetričnega valjanja, lahko pa se
uporablja tudi postopek asimetričnega valjanja. Asimetrični način valjanja se lahko izvede na
več različnih načinov. Na proces valjanja ima asimetrija pozitiven vpliv tako v tehnološkem
kot tudi ekonomskem smislu.
V okviru magistrske naloge smo raziskovali asimetrično valjanje aluminijeve zlitine EN AW-
5454. Za predvidene načine valjanja smo pri podobnih pogojih in vhodnih parametrih izdelali
simulacije valjanja. Na laboratorijskem valjalnem stroju smo izvedli simetrično kot tudi
asimetrično valjanje in različne izhodne parametre valjanja primerjali med seboj. Na
deformiranih vzorcih smo izvedli toplotno obdelavo. Vzorce smo žarili do mehkega stanja.
Na deformiranih kot tudi na toplotno obdelanih vzorcih smo za ugotovitev vpliva
asimetričnega valjanja na mehanske lastnosti izvedli več različnih mehanskih preizkusov.
Izvedli smo natezni preizkus, test plastične obremenitve in merjenje trdote. Spremembe
mehanskih lastnosti smo analizirali s pomočjo metalografije, kjer smo uporabili optični
mikroskop (LOM) in vrstični elektronski mikroskop (SEM)
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