Simulation of Recrystallization and Recrystallization Textures in Aluminium Alloys

2012 ◽  
Vol 715-716 ◽  
pp. 399-406
Author(s):  
Olaf Engler
Keyword(s):  
Crystallographic Texture ◽  
Process Development ◽  
Plastic Anisotropy ◽  
Process Models ◽  
Detailed Knowledge ◽  
Recent Developments ◽  
History Of ◽  
Computer Based ◽  
Strain Paths ◽  
Evolution Of Microstructure

The control of the plastic anisotropy during forming of a metallic sheet requires detailed knowledge on its microstructure and, especially, crystallographic texture. During the thermo-mechanical processing of aluminium sheet products in commercial production lines the material experiences a complex history of temperature, time and strain paths, which result in alternating cycles of deformation and recrystallization with the associated changes in texture and microstructure. Thus, computer-based alloy and process development requires integration of models for simulating the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. The present study focuses on recent developments in linking softening modules that simulate the progress of recovery and recrystallization with the following texture changes to deformation and microchemistry models.

Modelling of Recrystallisation Kinetics and Texture during the Thermo-Mechanical Processing of Aluminium Sheets

2005 ◽  
Vol 495-497 ◽  
pp. 555-566 ◽  
Author(s):  
Olaf Engler ◽  
L. Löchte ◽  
Kai F. Karhausen
Keyword(s):  
Crystallographic Texture ◽  
Rolling Mill ◽  
High Speed ◽  
Process Development ◽  
Process Models ◽  
Mechanical Processing ◽  
Recent Developments ◽  
Computer Based ◽  
Aluminium Sheets ◽  
Evolution Of Microstructure

Computer-based alloy and process development requires integration of models for simulating the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. The present paper focuses on recent developments in linking softening modules that simulate the progress of recovery and recrystallisation with the following texture changes to deformation and microchemistry models. The potential of such coupled simulations is illustrated by way of the thermo-mechanical processing of Al-Mg-Mn alloys. In particular, the progress of recrystallisation during coil cooling (“self-annealing”) as well as the texture differences between production on a reversible rolling mill and a high-speed tandem line are explored.

Simulation of Rolling and Recrystallization Textures in Aluminium Alloy Sheets

2007 ◽  
Vol 550 ◽  
pp. 23-34 ◽  
Author(s):  
Olaf Engler
Keyword(s):  
Process Development ◽  
Process Models ◽  
Mechanical Processing ◽  
Materials Properties ◽  
Hot Strip ◽  
Polycrystal Plasticity ◽  
Recent Developments ◽  
Computer Based ◽  
Evolution Of Microstructure ◽  
The Impact

Computer-based alloy and process development requires integration of models for simulating the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. The present paper focuses on recent developments in linking softening modules that simulate the progress of recovery and recrystallization with the following texture changes to deformation and microchemistry models. The potential of such coupled simulations is illustrated by way of the thermo-mechanical processing of Al-Mn-Mg AA 3104 can stock. In particular, the impact of inter-stand recrystallization between the tandem hot rolling passes as well as recrystallization during coil cooling (“self-annealing”) on the resulting hot strip and final gauge textures are explored. Finally, the predicted textures are input into a polycrystal-plasticity approach to simulate anisotropic properties (earing behaviour) of the sheets. Thus, it is possible to link the materials properties at final gauge to the decisive steps of deformation and recrystallization along the thermo-mechanical process chain.

On the Impact of Thermo-Mechanical Processing on Texture and the Resultant Anisotropy of Aluminium Sheet

2011 ◽  
Vol 702-703 ◽  
pp. 427-434
Author(s):  
Olaf Engler
Keyword(s):  
Crystallographic Texture ◽  
Process Development ◽  
Texture Evolution ◽  
Process Models ◽  
Mechanical Processing ◽  
Aluminium Sheet ◽  
Strain Paths ◽  
Sheet Products ◽  
Plant Trials ◽  
The Impact

During the thermo-mechanical processing of aluminium sheet products in commercial production lines the material experiences a complex history of temperature, time and strain paths, which result in alternating cycles of deformation and recrystallization with the associated changes in microstructure and, especially, crystallographic texture. Thus, computer-based alloy and process development requires integration of models for simulat¬ing the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. In the present paper the influence of texture on the anisotropic properties is explored for various industrially processed aluminium alloy sheets for packaging applications. Besides the use of experimentally measured sheet textures as an input for the anisotropy calculations, particular attention is given to the use of modelled textures. Here, results from a comprehensive through-process modelling of the texture evolution during the thermo-mechanical production of aluminium sheet are utilized. Eventually, this will enable us to predict the evolution of texture and the resulting properties along the entire process chain and hence to improve product quality of aluminium sheet products avoiding laborious and expensive plant trials.

Modelling of Microstructure and Texture and the Resulting Properties during the Thermo-Mechanical Processing of Aluminium Sheets

2006 ◽  
Vol 519-521 ◽  
pp. 1563-1568 ◽  
Author(s):  
Olaf Engler
Keyword(s):  
Texture Evolution ◽  
Mechanical Processing ◽  
Process Chain ◽  
Production Lines ◽  
Thermomechanical Process ◽  
Polycrystal Plasticity ◽  
History Of ◽  
Strain Paths ◽  
Aluminium Sheets ◽  
Evolution Of Microstructure

In order to predict the mechanical properties of Al sheet products, the evolution of microstructure and crystallographic texture along the process chain must be tracked. During the thermo-mechanical processing in commercial production lines the material experiences a complex history of temperature, time and strain paths, which results in alternating cycles of deformation and recrystallization with the associated changes in texture and microstructure. In the present paper the texture evolution of AA 3104 can body stock is modelled. In particular, the earing behaviour at final gauge is linked to the decisive steps of deformation and recrystallization along the thermomechanical process chain. For this purpose, the textures predicted by a comprehensive throughprocess model of the texture evolution during the thermo-mechanical production of Al sheet are input into a polycrystal-plasticity approach to simulate earing of the final gauge sheets.

scholarly journals The Past, Present and Future of Cannabis sativa Tissue Culture

Plants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 185
Author(s):  
Adrian S. Monthony ◽  
Serena R. Page ◽  
Mohsen Hesami ◽  
Andrew Maxwell P. Jones
Keyword(s):  
Tissue Culture ◽  
Disease Virus ◽  
Cannabis Sativa ◽  
Clonal Plants ◽  
Future Directions ◽  
The Past ◽  
Recent Developments ◽  
History Of ◽  
Drug Type

The recent legalization of Cannabis sativa L. in many regions has revealed a need for effective propagation and biotechnologies for the species. Micropropagation affords researchers and producers methods to rapidly propagate insect-/disease-/virus-free clonal plants and store germplasm and forms the basis for other biotechnologies. Despite this need, research in the area is limited due to the long history of prohibitions and restrictions. Existing literature has multiple limitations: many publications use hemp as a proxy for drug-type Cannabis when it is well established that there is significant genotype specificity; studies using drug-type cultivars are predominantly optimized using a single cultivar; most protocols have not been replicated by independent groups, and some attempts demonstrate a lack of reproducibility across genotypes. Due to culture decline and other problems, the multiplication phase of micropropagation (Stage 2) has not been fully developed in many reports. This review will provide a brief background on the history and botany of Cannabis as well as a comprehensive and critical summary of Cannabis tissue culture. Special attention will be paid to current challenges faced by researchers, the limitations of existing Cannabis micropropagation studies, and recent developments and future directions of Cannabis tissue culture technologies.

Transforming Historical Objectivism into Historical Hermeneutics: From “Historical Illness” to Properly Lived Historicality

2019 ◽  
Vol 61 (4) ◽  
pp. 490-515
Author(s):  
Thomas Tops
Keyword(s):  
Reception History ◽  
Biblical Studies ◽  
Historical Study ◽  
Necessary Condition ◽  
New Paradigm ◽  
History Of Interpretation ◽  
Critical Methodology ◽  
Recent Developments ◽  
History Of ◽  
Biblical Texts

Summary The present study analyses recent criticisms against the use of modern-historical methodologies in Biblical Studies. These methodologies abstract from the historical horizon of the researcher. In order to relate properly to the historicality of the researcher, historical objectivism needs to be transformed into historical hermeneutics. Recent developments in the historical methodology of biblical scholars are unable to reckon with the historicality of the researcher due to the partial or incorrect implementation of Gadamer’s views on reception history. I analyse the views of Nietzsche, Kierkegaard, and Gadamer on historicality and contend that the study of reception history is a necessary condition for conducting historical study from within the limits of our historicality. Reception history should not be a distinct methodological step to study the “Nachleben” of biblical texts, but needs to clarify how the understanding of these texts is already effected by their history of interpretation. The awareness of the presuppositions that have guided previous interpretations of biblical texts enables us to be confronted by their alterity. This confrontation calls for a synthesis between reception-historical and historical-critical methodology that introduces a new paradigm for conducting historical study in Biblical Studies in dialogue with other theological disciplines.

Why Diamonds Really are a Girl's Best Friend: Another American Narrative

Daedalus ◽  
2012 ◽  
Vol 141 (1) ◽  
pp. 89-100
Author(s):  
Linda K. Kerber
Keyword(s):  
The United States ◽  
Cultural Practice ◽  
Legal Tradition ◽  
Domestic Relations ◽  
Recent Developments ◽  
American Law ◽  
History Of ◽  
The Republic ◽  
1960S And 1970S ◽  
The 1960S

The old law of domestic relations and the system known as coverture have shaped marriage practices in the United States and have limited women's membership in the constitutional community. This system of law predates the Revolution, but it lingers in U.S. legal tradition even today. After describing coverture and the old law of domestic relations, this essay considers how the received narrative of women's place in U.S. history often obscures the story of women's and men's efforts to overthrow this oppressive regime, and also the story of the continuing efforts of men and some women to stabilize and protect it. The essay also questions the paradoxes built into American law: for example, how do we reconcile the strictures of coverture with the founders' care in defining rights-holders as “persons” rather than “men”? Citing a number of court cases from the early days of the republic to the present, the essay describes the 1960s and 1970s shift in legal interpretation of women's rights and obligations. However, recent developments – in abortion laws, for example – invite inquiry as to how full the change is that we have accomplished. The history of coverture and the way it affects legal, political, and cultural practice today is another American narrative that needs to be better understood.

scholarly journals The Personalized System of Instruction: Review and Applications to Distance Education

2003 ◽  
Vol 4 (2) ◽  
Author(s):  
Lyle K. Grant ◽  
Robert E. Spencer
Keyword(s):  
Distance Education ◽  
Teaching And Learning ◽  
Distance Teaching ◽  
Personalized System Of Instruction ◽  
History Of ◽  
Computer Based ◽  
Personalized System ◽  
Based Instruction ◽  
Basic Features ◽  
Key Terms

<P class=abstract>The present paper (a) outlines the basic features of the Personalized System of Instruction (PSI); (b) provides a brief history of PSI; and (c) describes the application of PSI to distance education. Some common misconceptions about PSI are also addressed. PSI is presented as a helpful universally applicable set of instructional practices that are well suited to distance teaching and learning.</P> <P class=abstract><B>Key Terms:</B> Personalized System of Instruction, distance learning, computer-based instruction, mastery-learning, self-pacing, higher-order objectives, scholarship of teaching, proctors, tutoring.</P> <p>

Collaborative Research Funding

2014 ◽  
Vol 36 (4) ◽  
Author(s):  
Markus Behnke ◽  
Laura McConnell ◽  
Chris Ober
Keyword(s):  
International Collaboration ◽  
Research Funding ◽  
International Committee ◽  
Research Projects ◽  
Scientific Success ◽  
Funding Sources ◽  
Chemistry Research ◽  
National Organizations ◽  
Recent Developments ◽  
History Of

Within a changing research world, international collaboration has become even more important in achieving scientific success. Given the increased need and desire for multinational research, the actors are forced to identify appropriate funding sources. Whereas, science knows no international boundaries, support for scientific research, including in chemical sciences, is mostly provided by the national funding organizations. This is particularly true for the chemical sciences, where most research projects are relatively small in size and with respect to the number of involved PIs. Traditionally, national organizations are reluctant to provide funds to non-domestic researchers, and in practice, funding truly international research projects can be a real challenge for a variety of technical and bureaucratic reasons. In an effort to change this, an international Committee on Chemistry Research Funding (CCRF)—backed by several leading funding organizations—was established by IUPAC in December 2007 to promote increased international collaboration and networking in the global chemistry community. The following report gives a short overview on the history of IUPAC’s involvement in service for chemistry research funding and on the most recent developments.

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