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Stability of microstructure in metallic systems | UNIVERSITY OF NAIROBI LIBRARY
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Stability Microstructure Metallic Systems
Condition: New. This item is printed on demand. Brand new book, sourced directly from publisher. Dispatch time is working days from our warehouse. Book will be sent in robust, secure packaging to ensure it reaches you securely. Language: English. Brand new Book. The second edition of this textbook, popular amongst students and faculty alike, investigates the various causes of thermodynamic instability in metallic microstructures.
Materials theoretically well designed for a particular application may prove inefficient or even useless unless stable under normal working conditions. The authors examine current experimental and theoretical understanding of the kinetics behind structural change in metals. The entire text has been updated in this new edition, and a completely new chapter on highly metastable alloys has been added.
Stability of microstructure in metallic systems
The degree to which kinetic stability of the material outweighs its thermodynamic instability is very important, and dictates the useful working life of the material. If the structure is initially produced to an optimum, such changes will degrade the properties of the material.
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Microstructural instability commonly arises from a progressive decrease in interfacial area and thus in free energy. Particle coarsening processes provide an example of this but most of the work on microstructural instability has concentrated attention on particles within grains and at grain boundary surfaces. Despite the fact that the geometrical principles are well documented and understood, little consideration has been given to the coarsening processes of particles at grain edges and grain corners beyond the general recognition that such sites present favourable situations for preferential growth.
It is noted here that certain specific features arise for particular values of the ratio between the interfacial and grain-boundary energies. Within a specific range of values of this ratio which are not very common in practice, there is a possibility of preferential growth of particles at grain corners and their stabilization independently of their initial size.
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More particularly and over a wider range of this ratio, a gross change in particle morphology, effectively as a spreading as a second phase along grain edges, can occur with the special characteristics that there is an advantage to such spreading with a small cross-section perpendicular to the grain edge at the expense of some reduction in the cross-section of a thicker section of material spread along a neighbouring grain edge.
From these considerations, it is suggested that a particularly stable form of microstructure may be developed which could conceivably form a good basis for fibre reinforcement. Unable to display preview. Download preview PDF. Skip to main content. Advertisement Hide.
Some geometrical aspects of microstructural stability. In addition, it was found that the normal cutting force is substantially equal to the tangential forces in nanometric cutting of MGs by molecular dynamics simulation, which is different from that of crystal alloys. Therefore, the objectives of this paper are to investigate the effect of machining parameters on cutting forces in nanometric cutting process and analyze the microstructure evolution of the metallic glass workpiece.
Keywords: Amorphous alloys, nanometric cutting, molecular dynamics simulation, radial distribution function.
Abstract: Background: Unlike the traditional crystalline metals, metallic glasses are lack of longrange order and have short-range order. Journal Name: Current Nanoscience. Volume 13 , Issue 1 , Journal Home. Graphical Abstract: Abstract: Background: Unlike the traditional crystalline metals, metallic glasses are lack of longrange order and have short-range order.
Methods: The radial distribution functions were calculated to verify the amorphous state of workpiece.