Download or read book The Effects of Scandium and Zirconium Additions on Aluminum Mechanical Properties Post braze Grain Structure and Extrusion written by Cory R. Williams and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1997 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Zirconium and Scandium on the Microstructure Tensile Properties and Hot tearing Susceptibility of Al 2WT Cu based Alloys written by Ahmed Nabawy and published by . This book was released on 2010 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Processing and Mechanical Properties of Cast Aluminum Containing Scandium Zirconium and Ytterbium written by Nicholas D. Johnson and published by . This book was released on 2011 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Composition on the Mechanism of Continuous Recrystallization and Superplastic Response of Aluminum scandium Alloys written by and published by . This book was released on 1993 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The continuous recrystallization (CRX) appears to be fundamental in Al-Sc because it occurs irrespective of solute composition. It appears to be due to a combination of subgrain coalescence at low strains and incorporation of additional dislocations generated during grain boundary sliding at higher strains when the misorientation has increased sufficiently. Alloying additives such as Mg, Li are more important with respect to deformation after CRX is completed. Mg, and to a lesser extent Li, affect the max m-values (strain-rate sensitivities) in Al-Sc by changing the melting points (mp). Max m- values correlate inversely with mp so that the alloy with the greatest Mg had the highest m-values and lowest mp; the stress is raised at which power-law creep and breakdown occurs. The power-law breakdonw at much lower stresses in Al-0.5Sc and Al-1.2Li-0.5Sc causes the m-value to decrease more rapidly with strain rate. Al alloys for commercial superplastic applications should contain elements that raise the power-law strength so that the m-values are maximized while preserving the post-formed mechanical properties. Refs, figs, tabs.
Download or read book Equal Channel Angular Extrusion Characteristics on Mechanical Behavior of Aluminum Alloy written by Abiodun Ayodeji Abioye and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials strengthened by conventional methods such as strain hardening, solute additions, precipitation and grain size refinement are often adopted in industrial processes. But there is limitation to the amount of deformation that these conventional methods can impact to a material. This study focused on the review of major mechanical properties of aluminum alloys in the presence of an ultrafine grain size into polycrystalline materials by subjecting the metal to an intense plastic straining through simple shear without any corresponding change in the cross-sectional dimensions of the sample. The effect of the heavy strain rate on the microstructure of aluminum alloys was in refinement of the coarse grains into ultrafine grain size by introducing a high density of dislocations and subsequently re-arranging the dislocations to form an array of grain boundaries. Hence, this investigation is aimed at gathering contributions on the influence of equal channel angular extrusion toward improving the mechanical properties of the aluminum alloys through intense plastic strain.
Download or read book Effect of Multidirectional Forging with Decreasing Temperature on the Microstructure and Microhardness of the Aluminum Magnesium Scandium Zirconium Alloy written by O. S. Sitdikov and published by . This book was released on 2020 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evolution of the microstructure and microhardness of the cast and homogenized aluminum alloy 1570C (aluminum [Al]-5 magnesium [Mg]-0.18 manganese [Mn]-0.2 scandium [Sc]-0.08 zirconium [Zr], wt. %) were studied under multidirectional forging (MDF) with decreasing the temperature. Sequential compression passes were performed at a strain rate of 10 -2 s -1 with 90 changing of the loading axes from pass to pass; with the strain per pass of ? e =0.7 and the 25Degree C decrease of temperature in each pass, starting from 450Degree C ( T =0.8 Tm ). It has been shown that the alloy ductility was sufficient for straining the samples without cracking up to the total strain of s e =10.5 at 100 degree C (about 0.4 Tm ). In the initial state, the alloy possessed a coarse-grained structure with a grain size of about 25 ?m and a uniform distribution of the Al 3 (Sc,Zr) nanoscale aluminides. MDF led to a continuous grain refinement. At relatively low strains, s e =4.2 (and high temperatures, T =325 Degree C), new grains were evolved mainly in the mantle areas of initial grains, resulting in the formation of a bimodal (sub)grain structure, which persisted up to s e =8.4 ( T =175Degree C). During further MDF, the alloy structure became more homogeneous and fine-grained, and at s e =10.5 ( T =100Degree C), it almost completely transformed into a nanocrystalline grain structure with a crystallite size of 100-150 nm, stabilized by nanodispersed Al 3 (Sc,Zr) precipitates. The average size of the deformation-induced (sub)grains in the whole range of strains (temperatures) studied obeyed a power-law function of the flow stresses with the exponent close to -0.75. The microhardness testing showed that MDF did not lead to the notable alloy hardening in the samples deformed at relatively high temperatures ( T >325Degree C) and low strains (s e
Download or read book Thermomechanical Processing of Aluminum Micro alloyed with Sc Zr Ti B and C written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Critical exploration of the minimalistic high strength low alloy aluminum (HSLA-Al) paradigm is necessary for the continued development of advanced aluminum alloys. In this study, scandium (Sc) and zirconium (Zr) are examined as the main precipitation strengthening additions, while magnesium (Mg) is added to probe the synergistic effects of solution and precipitation hardening, as well as the grain refinement during solidification afforded by a moderate growth restriction factor. Further, pathways of recrystallization are explored in several potential HSLA-Al systems sans Sc. Aluminum-titanium-boron (Al-Ti-B) and aluminum-titanium-carbon (Al-Ti-C) grain refining master alloys are added to a series of Al-Zr alloys to examine both the reported Zr poisoning effect on grain size reduction and the impact on recrystallization resistance through the use of electron backscattered diffraction (EBSD) imaging. Results include an analysis of active strengthening mechanisms and advisement for both constitution and thermomechanical processing of HSLA-Al alloys for wrought or near-net shape cast components. The mechanisms of recrystallization are discussed for alloys which contain a bimodal distribution of particles, some of which act as nucleation sites for grain formation during annealing and others which restrict the growth of the newly formed grains.
Download or read book ANALYZING VARIATION IN DISPERSOID FORMATION IN ALUMINUM ALLOYS BY MINOR CHANGES IN HOMOGENIZATION TEMPERATURE written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : The homogenization of billets in the aluminum extrusion industry is a critical step that removes chemical segregation from casting, dissolves low melting point phases, forms nanoscale dispersoid phases, and promotes the beta to alpha transformation of iron particles in the matrix. With ever increasing use of aluminum extrusion in the automotive industry there is a constant need for increased efficiency and consistency in processing of extruded aluminum. The work in this thesis explores the effects of 10℗ʻC differences in the homogenization temperature on the formation of dispersoids in 6082 alloys used in the automotive industry. The role of dispersoids is to prevent the recrystallization of grains during extrusion giving a more uniform grain structure, improved mechanical properties, and improved corrosion resistance when compared to dispersoid-free alloys. This work found a 10°C increase in homogenization temperature resulted in a 5-15% decrease in dispersoid density, 5-10% increase in dispersoid size, and noticeable effect on mechanical and chemical properties. This effect was maintained regardless of the holding time, temperature, or ramp rate used for homogenization. Additional studies on the effects of two-step homogenizations found similar results on the variation in dispersoid density but had improved properties when compared to one-step homogenization cycles currently used in industry, shedding light on the importance of dispersoid nucleation mechanism in developing improved thermal processing of billets.
Download or read book The Origin of Surface Recrystallization in Extrusion of 6xxx Aluminum Alloys written by William H. Van Geertruyden and published by . This book was released on 2004 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: During extrusion of many aluminum alloys, surface imperfections may be present as a result of imposed processing parameters. One such surface imperfection is the presence of coarse grains at the surface, known as a Peripheral Coarse Grain (PCG) structure that has been known to affect mechanical properties and aesthetics of the extruded material. The objective of this research is to understand the origin of the PCG structure in 6xxx series aluminum alloys and further understand the effect of processing parameters on its appearance.
Download or read book Effects of Zr and V on Microstructure and Hot Deformation Behavior of 7150 Aluminum Alloys written by Cangji Shi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Après avoir été allié avec du Zr de 0 à 0,19% en poids, les résultats ne montrent pas de variation significative du pic de la contrainte d'écoulement ou de l'énergie d'activation entre l'alliage de base 7150 et l'alliage contenant 0,04% en poids de Zr.
Download or read book Effect of Scandium Additions on Aluminium Alloy 7050 written by Fionnuala Costello and published by . This book was released on 2003 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1993 with total page 1146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Materials 2 written by Michael F. Ashby and published by Elsevier. This book was released on 2014-06-28 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a thorough explanation of the basic properties of materials; of how these can be controlled by processing; of how materials are formed, joined and finished; and of the chain of reasoning that leads to a successful choice of material for a particular application. The materials covered are grouped into four classes: metals, ceramics, polymers and composites. Each class is studied in turn, identifying the families of materials in the class, the microstructural features, the processes or treatments used to obtain a particular structure and their design applications. The text is supplemented by practical case studies and example problems with answers, and a valuable programmed learning course on phase diagrams.
Download or read book CRC Handbook of Metal Etchants written by Perrin Walker and published by CRC Press. This book was released on 1990-12-11 with total page 1434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication presents cleaning and etching solutions, their applications, and results on inorganic materials. It is a comprehensive collection of etching and cleaning solutions in a single source. Chemical formulas are presented in one of three standard formats - general, electrolytic or ionized gas formats - to insure inclusion of all necessary operational data as shown in references that accompany each numbered formula. The book describes other applications of specific solutions, including their use on other metals or metallic compounds. Physical properties, association of natural and man-made minerals, and materials are shown in relationship to crystal structure, special processing techniques and solid state devices and assemblies fabricated. This publication also presents a number of organic materials which are widely used in handling and general processing...waxes, plastics, and lacquers for example. It is useful to individuals involved in study, development, and processing of metals and metallic compounds. It is invaluable for readers from the college level to industrial R & D and full-scale device fabrication, testing and sales. Scientific disciplines, work areas and individuals with great interest include: chemistry, physics, metallurgy, geology, solid state, ceramic and glass, research libraries, individuals dealing with chemical processing of inorganic materials, societies and schools.
Download or read book Advanced Aluminum Alloys Containing Scandium written by L S Toropova and published by Routledge. This book was released on 2017-07-05 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to generalize and analyze the extensive experimental and theoretical results on the phase composition, structure, and properties of aluminum alloys containing scandium. The effects of scandium on these properties are studied from a physico- chemical viewpoint. The authors present binary, ternary, and more complex phase diagrams for these alloys and consider in detail recrystallization, superplastic behavior, and decomposition of supersaturated solid solutions and the effects of solidification conditions on phase equilibria.
Download or read book Metallurgical and Ceramic Protective Coatings written by K.H. Stern and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface engineering is an increasingly important field and consequently those involved need to be aware of the vast range of technologies available to modify surfaces. This text provides an up-to-date, authoritative exposition of the major condensed phase methods used for producing metallurgical and ceramic coatings. Each method is discussed thoroughly by an expert in that field. In each chapter the principle of the method, its range of applications and technical aspects involved are described. The book not only informs the reader about established technologies familiar only to specialists, but also details activity on the frontier of coating technology providing an insight into those potential technologies not yet fully developed but which should emerge in the near future.
