Structure of Grain Boundaries and Aspects of Deformation Behavior in Ni3Al Alloys PDF Download
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Author: Ronald James Kerans
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Ronald James Kerans
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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The structures of two grain boundaries in Ni3Al were determined using transmission electron microscopy (TEM). The line directions and spacings of secondary grain boundary dislocation (gbds) were calculated for coincidence site lattice (CSL) relationships near the experimentally determined misorientations. The structures of the boundaries were found to be in good agreement with 9 and 31b relationships of the ordered lattice. The grain boundary dislocations were found to be characteristic of the ordered structure. No grouping of partial gbds was observed. Lattice dislocations consisting of pairs of 1/3 (112) superpartials bounding extended superlattice intrinsic stacking faults (SISFs) were observed by TEN. They were found to independently react to APB coupled 112 110 pairs in the commonly observed pure screw orientation. Implications with regard to Kear-Wilsdorf type locking mechanisms and deformation behavior are discussed. Boron was observed to have strong effects upon the population of boundary types, grain size, and grain growth. In addition, small amounts of B completely eliminate widely extended stacking faults. It is concluded that effects of B other than influencing boundary cohesion are important.
Author:
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Category :
Languages : en
Pages : 34
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Atomic structure and atomic level properties of grain boundaries in binary alloys have been studied theoretically. Both ordered and disordered alloys were investigated with the aim responsible for the physical and mechanical properties differing from pure metals. An integral part is atomic interactions. The first are the many-body potentials akin to the embedded atom method. The most important potentials for Cu-Bi which combined empirical data and ab initio electronic structure calculations to construct reliable potentials. LMTO based tight-binding method were developed fully for pure metals with future application alloys. Structural studies were carried out for disordered Cu-Bi and ordered Ni3Al and Cu3Au alloys. In the former case the investigation was linked with HREM, and result is solution of structure of? = 3 (111)/(11{bar 1}) facets containing Bi formed during segregation from originally curved boundaries. In the latter case, effect of ordering strength and stoichiometry deviations the boundary structure was investigated. The most interesting finding is a very different behavior of Ni rich and Al rich Ni3Al which may explain why only Ni rich compounds can be ductilized by boron. In both cases the surplus element segregates to the boundaries.
Author: Anning Hu
Publisher: Springer Science & Business Media
ISBN: 1475701810
Category : Technology & Engineering
Languages : en
Pages : 441
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Book Description
In view of the dramatically increased interest in the study of grain boundaries during the past few years, the Physical Metal lurgy Committee of The Institute of Metals Division of The Metal lurgical Society, AIME, sponsored a four-session symposium on the NATURE AND BEHAVIOR OF GRAIN BOUNDARIES, at the TMS-AIME Fall Meeting in Detroit, Michigan, October 18-19, 1971. The main ob jectives of this symposium were to examine the more recent develop ments, theoretical and experimental, in our understanding of grain boundaries, and to stimulate further studies in these and related areas. This volume contains most of the papers presented at the Symposium. It is regrettable that space limitations allow the inclusion of only four of the unsolicited papers, in addition to thirteen invited papers. The papers are grouped into three sections according to their major content: STRUCTURE OF GRAIN BOUNDARIES, ENERGETICS OF GRAIN BOUNDARIES, and GRAIN BOUNDARY MOTION AND RELATED PHENOMENA. Grain boundaries, or crystal interfaces, have been of both academic and practical interest for many years. An early seminar on "Metal Interfaces" was documented in 1952 by ASM. The Fourth Metallurgical Colloquium held in France, 1960, had a broad coverage on "Properties of Grain Boundaries". More recently the Australian Institute of Metals sponsored a conference on interfaces, with the proceedings being published by Butterworths in 1969.
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Category : Power resources
Languages : en
Pages : 782
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Category : Aeronautics
Languages : en
Pages : 704
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Atomic structure and atomic level properties of grain boundaries in binary alloys have been studied theoretically. Both ordered and disordered alloys were investigated with the aim responsible for the physical and mechanical properties differing from pure metals. An integral part is atomic interactions. The first are the many-body potentials akin to the embedded atom method. The most important potentials for Cu-Bi which combined empirical data and ab initio electronic structure calculations to construct reliable potentials. LMTO based tight-binding method were developed fully for pure metals with future application alloys. Structural studies were carried out for disordered Cu-Bi and ordered Ni3Al and Cu3Au alloys. In the former case the investigation was linked with HREM, and result is solution of structure of [Sigma] = 3 (111)/(11{bar 1}) facets containing Bi formed during segregation from originally curved boundaries. In the latter case, effect of ordering strength and stoichiometry deviations the boundary structure was investigated. The most interesting finding is a very different behavior of Ni rich and Al rich Ni3Al which may explain why only Ni rich compounds can be ductilized by boron. In both cases the surplus element segregates to the boundaries.
Author: Rahul Mitra
Publisher: CRC Press
ISBN: 1466511885
Category : Technology & Engineering
Languages : en
Pages : 318
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Book Description
Fills a Prominent Gap in a Significant Area of IntermetallicsPresenting a comprehensive overview of structural intermetallics (the most important class of intermetallics), Structural Intermetallics and Intermetallic Matrix Composites is a reference written with the beginning student as well as the practicing professional in mind. Utilizing the auth
Author: David J. Fisher
Publisher: Trans Tech Publications Ltd
ISBN: 3038261998
Category : Technology & Engineering
Languages : en
Pages : 200
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Book Description
The nickel aluminide intermetallic is a particularly useful alloy for application at high temperatures because, unlike most materials, it exhibits the unusual property of becoming stronger with increasing temperature: depending upon the minor alloying additions, the 0.2% yield strength peaks at between 600 and 800C. The reason for this anomalous behaviour can be traced to the effect of the superlattice structure upon diffusional mass transfer and defect motion. The present volume contains a compilation (350 items, 176 pages) of data specifically covering the known diffusion and defect properties of this material.
Author: Yuntian T. Zhu
Publisher: Springer Science & Business Media
ISBN: 9781402039225
Category : Science
Languages : en
Pages : 332
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Book Description
Recently, it was reported that nanostructured materials processed under high pressure by HPT and ECAP have an extraordinary combination of both high strength and high ductility, which are two desirable, but rarely co-existing properties. These findings indicate that high-pressure is a critical factor that can be employed to process nanostructured materials with superior mechanical, and possibly also physical, properties. It is the objective of this workshop to review our current knowledge, identify issues for future research, and discuss future directions on the processing and properties of nanostructured materials via SPD techniques, with a special emphasis on high-pressure effects. The 42 peer-reviewed papers in this book cover areas of high pressure effect on the nanostructure and properties of SPD-processed materials, fundamentals of nanostructured materials, development of high-pressure SPD technologies for commercializations, recent advances of SPD technologies as well as applications and future markets of SPD-processed nanostructured materials.
