1,721,049 research outputs found
Dissociation of super-dislocations and the stacking fault energy in TiAl based alloys with Nb-doping
No full textDissociations of super-dislocations in gamma-TiAl in Nb-doped Ti-48 at.% Al-1 at.% Nb and Ti-48 at.% Al-10 at.% Nb have been studied by high resolution transmission electron microscopy (HRTEM) and weak beam transmission electron microscopy (TEM). The SISF energy was calculated to be 63 mJ/m(2) in Ti-48 at.% Al-1 at.% Nb and 34 mJ/m(2) in Ti-48 at.% Al-10 at.% Nb according to the dissociation width, respectively. Consequently, it is concluded that Nb-addition can decrease the SF energy significantly, which contribute obviously to the strengthening effect induced by Nb-doping. (c) 2006 Elsevier B.V. All rights reserved
Al intermetallics
No full textTitanium-aluminum alloys comprising mainly the TiAl-phase and a small amount of the Ti3Al-phase are promising candidates for application as high-temperature materials. Alloying addition of Nb improves clearly the mechanical strength and the oxidation resistance of these alloys. A dual-phase TiAl/Ti3Al alloy with additions of 5 at.%Nb was investigated in this study by means of field-ion microscopy (FIM), tomographic atom probe (TAP) and transmission electron microscopy (TEM). It has been found that the structure of the two phases and the lamellar structure of the alloy were not seriously changed by the addition of 5 at.% Nb. The structural anisotropy of the TiAl phase along [100] and [001] directions, as revealed by FIM, was analyzed. FIM observations and atom probe analyses showed that Nb atoms in TiAl phase preferentially occupy Ti atomic sites. Preliminary reconstruction of the atomic stacking sequence perpendicular to [001] direction of the gamma-TiAl phase from the TAP measurements was demonstrated and is discussed. Copyright (C) 2007 John Wiley & Sons, Ltd
Exploring precipitates in a severely deformed Al-Mg-Si alloy at the atomic level
No full textDMG is the TEM images
emd is Velox file
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
Variations on the Author
Full text link“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
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