Download or read book Microstructure Development in Highly Undercooled Aluminum Alloys written by Boyd Arthur Mueller and published by . This book was released on 1986 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Undercooling of Aluminum Alloys written by and published by . This book was released on 1988 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of refined microstructures for dispersion strengthening of Aluminum alloys by rapid solidification is related to the undercooling at nucleation and during competitive crystal growth. With controlled droplet samples the important processing parameters that govern undercooling in the powders have been identified and include powder size and coating melt cooling rate and superheat. The droplet method has yielded measured undercoolings of 175 C for AL and values near 300 C for some AL alloys. Droplet studies have been valuable in examining the solidification pathways including thermal history effects associated with rapid solidification and dispersoid formation in Aluminum-Nickel, Aluminum-Iron, and Aluminum-Beryllium alloys. Based on the analysis of solidification pathways, microstructure maps may be developed to identify the processing that can yield fine-scale eutectics, metastable structures or suppression of coarse primary intermetallic phases which are useful for the development of dispersoid structures. (jg).

Download or read book Rapid Solidification of Highly Undercooled Aluminum Powders written by GJ. Hildeman and published by . This book was released on 1986 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The amount of liquid undercooling attained during rapid solidification processing (RSP) is an important factor in determining microstructural development. An effective experimental method that may be applied in assessing undercooling potential involves the examination of a dispersion of stabilized, fine (5 to 20-μm) liquid droplets. Substantial undercoolings (?T >= 160°C) have been measured by differential thermal analysis for slowly cooled (30°C/min) droplet emulsions of aluminum alloys. Results from Al-Si and Al-Fe alloys indicate that undercooling is a function of droplet size, melt super-heating, and material composition. Comparison studies have also been conducted relating the amount of undercooling to microstructural refinement in alloys prepared as droplet emulsions and by air atomization. The results indicate that at large undercooling (?T > 260°C) droplet solidification can yield a microstructure similar to that formed in atomized powder. Microstructural variations with powder size are related not only to a changing cooling rate but also to a modified undercooling behavior. These observations highlight the role of undercooling in RSP and indicate that the droplet approach can be effective in examining potential aluminum powder metal alloys and in optimizing processing procedures for rapid quenching treatments.

Download or read book Microstructural Development of Undercooled AL NI Eutectic Alloys written by David Ulrich Furrer and published by . This book was released on 1988 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solidification of Aluminum and Aluminum Alloys at High Levels of Undercooling written by Stephen Edward LeBeau and published by . This book was released on 1982 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rapidly Solidified Powder Aluminum Alloys written by Morris E. Fine and published by ASTM International. This book was released on 1986 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Science and Technology of the Undercooled Melt written by P.R. Sahm and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: "SCIENCE AND TECHNOLOGY OF '!HE UNDEROLED MELT" This title was chosen as the topical headline of the Advanced Research Workshop (ARW) from March 17 to 22 1985, held at the Castle of Theuern. The usual term "Rapid Solidification" is an overlapping description. Due to the fact that nucleation is so eminently important for the undercooling of a melt and this, in turn, is an important characteristic of rapid solidifi cation, undercooling plays an essential role in "rapid solidification." The undercooled melt has caused an "accelerated evolution" (if not a revolution) in materials science during the last decade. Several rather exciting concepts with interesting potential for novel applications are being pursued presently in various laboratories and companies. They concern not only new processes and ha~ware developments, but also present chal lenging perspectives for ventures, including the founding of new companies; or they promise growth possibilities with established larger and smaller industrial establishments.

Download or read book Evaluation of Microstructural Development in Bulk Undercooled Alloys written by Fay Hua and published by . This book was released on 1995 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metastable Microstructures written by Dipankar Banerjee and published by . This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructure Development During Solidification of Aluminium Alloys written by Démian Gibrán Ruvalcaba Jiménez and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural Development in Undercooled Lead antimony Alloys written by Patti Kay Waldschmidt and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rapidly Quenched Metals 6 Volume 3 written by R.W. Cochrane and published by Elsevier. This book was released on 1988-01-01 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapidly Quenched Metals 6: Volume 3

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of Rapid Solidification Techniques to Aluminum Alloys written by C. G. Lebi and published by . This book was released on 1978 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This portion of the program was conducted for the purpose of developing a predictive model of heat flow and solidification for aluminum alloys produced under the high cooling rate conditions achievable in atomization processes. It is a combined experimental and theoretical study of the relationship between the important solidification variables (e.g. cooling rate, temperature gradients, interface shape and velocity, supercooling and transformation kinetics) and the structure of rapidly solidified aluminum alloy powders. This report covers that portion of the investigations which addressed the characterization of the thermal history of rapid solidification in metal droplets, and its effects on powder microstructure. The main effort was focused on modelling the heat flow during solidification, and relationships were established between the atomization parameters, the growth kinetics, the interface velocity and undercooling, and other important variables. Numerical solutions based on the enthalpy model were developed, and their results compared to the trends predicted from the Newtonian model. The analysis covered situations of isothermal solidification at the melting temperature, as well as those where significant undercoolings are necessary for nucleation and growth. The implications of single vs. multiple nucleation were also discussed. The concepts developed from the heat flow analysis were coupled to microstructural observations in Aluminum alloy powders, mostly in the submicron size range. It was shown that reducing the particle size decreases the extent of segregation, promotes multiple nucleation and the formation of twins during solidification.

Download or read book Microstructure Development in 6000 Series Aluminum Alloys Processed Via Equal Channel Angular Extrusion written by William Heffner and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Industry standard 6061 and 6063 Aluminum alloys were processed by equal channel angular extrusion (ECAE) at room temperature using a Bc route with a constant feed rate of 0.25 mm/s through a die angle of 90° between the die channels. The influence of ECAE processing on the evolution of the microstructure, microtexture and microhardness in the material was studied using orientation imaging microscopy (OIM), X-ray diffractometry, and Vickers microhardness testing. Detailed analysis was carried out on samples of the as-received, one, two, four and eight pass conditions.

Download or read book Rapidly Quenched Metals 6 Volume 2 written by R.W. Cochrane and published by Elsevier. This book was released on 1988-01-01 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapidly Quenched Metals 6: Volume 2

Download or read book An Examination of Microstructure Development in Al Si and Al Cu Alloys microform written by Nurhan Apaydin and published by National Library of Canada. This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: