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Science and Technology of the Undercooled Melt

2012-12-06 Science
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Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 56X/5 ( reviews)

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Book Synopsis Science and Technology of the Undercooled Melt by : P.R. Sahm

Download or read book Science and Technology of the Undercooled Melt written by P.R. Sahm. This book was released on 2012-12-06. 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.

Rapid Solidification of Undercooled Melts

2018 Technology
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Release : 2018
Genre : Technology
Kind : eBook
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Book Synopsis Rapid Solidification of Undercooled Melts by : Xiaolong Xu

Download or read book Rapid Solidification of Undercooled Melts written by Xiaolong Xu. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: Rapid solidification and microstructure evolution of deeply undercooled bulk concentrated Ni-20%at.Cu and Co-20%at.Pd alloys are strictly and systematically evaluated. First, thermodynamics of the undercooled melt is discussed. Consideration is provided for not only the systematic microstructure evolution within a broad undercooling range, but also the dendrite growth mechanism and the rapid solidification characteristics. The dendrite growth in the bulk undercooled melts was captured by a high speed camera. The first kind of grain refinement occurring in the low undercooling regimes was explained by a current grain refinement model. Besides for the dendrite melting mechanism, the stress originating from the solidification contraction and thermal strain in the first mushy zone during rapid solidification could be a main mechanism causing the second kind of grain refinement above the critical undercooling. This internal-stress led to the distortion and breakup of the primary dendrites and was semi-quantitatively described by a corrected stress accumulation model. It was found that the stress induced recrystallization could make the primary microstructures refine substantially after recalescence.

Solidification of Containerless Undercooled Melts

2012-05-21 Technology & Engineering
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Release : 2012-05-21
Genre : Technology & Engineering
Kind : eBook
Book Rating : 929/5 ( reviews)

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Book Synopsis Solidification of Containerless Undercooled Melts by : Dieter M. Herlach

Download or read book Solidification of Containerless Undercooled Melts written by Dieter M. Herlach. This book was released on 2012-05-21. Available in PDF, EPUB and Kindle. Book excerpt: All metallic materials are prepared from the liquid state as their parent phase. Solidification is therefore one of the most important phase transformation in daily human life. Solidification is the transition from liquid to solid state of matter. The conditions under which material is transformed determines the physical and chemical properties of the as-solidified body. The processes involved, like nucleation and crystal growth, are governed by heat and mass transport. Convection and undercooling provide additional processing parameters to tune the solidification process and to control solid material performance from the very beginning of the production chain. To develop a predictive capability for efficient materials production the processes involved in solidification have to be understood in detail. This book provides a comprehensive overview of the solidification of metallic melts processed and undercooled in a containerless manner by drop tube, electromagnetic and electrostatic levitation, and experiments in reduced gravity. The experiments are accompanied by model calculations on the influence of thermodynamic and hydrodynamic conditions that control selection of nucleation mechanisms and modify crystal growth development throughout the solidification process.

Metastable Solids from Undercooled Melts

2006-12-18 Technology & Engineering
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Release : 2006-12-18
Genre : Technology & Engineering
Kind : eBook
Book Rating : 861/5 ( reviews)

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Book Synopsis Metastable Solids from Undercooled Melts by : Dieter Herlach

Download or read book Metastable Solids from Undercooled Melts written by Dieter Herlach. This book was released on 2006-12-18. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the physical concepts and tools to characterize and describe the formation of metastable solids from undercooled melts. Its aim is to facilitate understanding of the development of the science and technology of solidification of melts and to introduce new concepts within this exciting research field in order to fulfil the challenges of the future in the field of undercooled melts. A comprehensive description of the science and applications of the undercooling phenomenon is given. It is composed of several main parts: experimental techniques for undercooling; characterization of the undercooled melt as the first step in rapid solidification; introducing the concepts of modern theories of rapid dendrite and eutectic growth and their comparison with experimental results, and a survey of metastable materials formed from the non-equilibrium state of an undercooled melt.* Showing clear links to possible application of results obtained from basic research * The subject matter is multidisciplinary and will be of interest to material scientists, physicists, physical chemists, mechanical and electrical engineers

Rapid Solidification of Deeply Undercooled Metallic Melts

1992
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Release : 1992
Genre :
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Book Synopsis Rapid Solidification of Deeply Undercooled Metallic Melts by : Richard Gary Hamerton

Download or read book Rapid Solidification of Deeply Undercooled Metallic Melts written by Richard Gary Hamerton. This book was released on 1992. Available in PDF, EPUB and Kindle. Book excerpt:

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