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Languages : en
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Trace elements and impurities often segregate strongly to grain boundaries in metals and alloys. Concentrations of these elements at grain boundaries are often 103 to 105 times as great as their overall concentration in the alloy. Because of such segregation, certain trace elements can exert a disproportionate influence on material properties. One frequently observed consequence of trace element segregation to grain boundaries is the occurrence of grain boundary failure and low ductility. Less well known are incidences of improved ductility and inhibition of grain boundary fracture resulting from trace element segregation to grain boundaries in certain systems. An overview of trace element segregation and intergranular failure in a variety of alloy systems as well as preliminary results from studies on Al 3% Li will be presented.
Author:
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Category :
Languages : en
Pages :
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Book Description
Trace elements and impurities often segregate strongly to grain boundaries in metals and alloys. Concentrations of these elements at grain boundaries are often 103 to 105 times as great as their overall concentration in the alloy. Because of such segregation, certain trace elements can exert a disproportionate influence on material properties. One frequently observed consequence of trace element segregation to grain boundaries is the occurrence of grain boundary failure and low ductility. Less well known are incidences of improved ductility and inhibition of grain boundary fracture resulting from trace element segregation to grain boundaries in certain systems. An overview of trace element segregation and intergranular failure in a variety of alloy systems as well as preliminary results from studies on Al 3% Li will be presented.
Author: A. Kumar
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Author: Pavel Lejcek
Publisher: Springer Science & Business Media
ISBN: 3642125050
Category : Technology & Engineering
Languages : en
Pages : 249
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Book Description
Grain boundaries are important structural components of polycrystalline materials used in the vast majority of technical applications. Because grain boundaries form a continuous network throughout such materials, their properties may limit their practical use. One of the serious phenomena which evoke these limitations is the grain boundary segregation of impurities. It results in the loss of grain boundary cohesion and consequently, in brittle fracture of the materials. The current book deals with fundamentals of grain boundary segregation in metallic materials and its relationship to the grain boundary structure, classification and other materials properties.
Author: G. Was
Publisher: Trans Tech Publications Ltd
ISBN: 3035704414
Category : Technology & Engineering
Languages : en
Pages : 374
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Materials Science Forum Vol. 46
Author: Harris L. Marcus
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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The results of this program are: The first direct experimental evidence for the phenomena of metastable grain boundary segregation and a model for its relation to the influence of environments on fracture behavior; The influence of grain boundary segregation on the grain boundary fracture of carburized steels; The segregation of As to the transgranular fracture surface of steels and how it related to the lowering of the fracture resistance of these steels; An electrochemical method of charging samples with both hydrogen and hydrogen recombination poisons to subsequently induce grain boundary failure in the Auger electron spectroscopy fracture studies of iron and nickel alloys; The application of X ray photoelectron spectroscopy to determine changes in electronic structure that can be related to the nature of the local bonding in the segregated region of iron intermetallic compounds.
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Category : Grain boundaries
Languages : en
Pages : 0
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Author: John R Low (Jr)
Publisher:
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Category :
Languages : en
Pages : 37
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The report discusses two investigations of temper embrittlement in low alloy quenched and tempered steel. Part I deals with additive effects of phosphorus and antimony as embrittling impurities in this type of grain-boundary embrittlement. Part II describes efforts to develop a method of determining the degree of segregation of alloys and impurities to grain-boundaries during temper embrittlement. The method under study involves neutron activation analysis of the etchant from etched intergranular fracture surfaces. (Author).
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721258826
Category :
Languages : en
Pages : 38
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Turbine disk alloys subjected to fatigue cycles with dwells at high temperatures and stresses can fail by cracking along grain boundaries. This could be due to concentrated creep deformation or environmental attack at grain boundaries. It would be important to identify any chemical segregation along grain boundaries to aid understanding of this intergranular failure mode. The objective of this study was to evaluate the degree of chemical segregation present at the grain boundaries of two disk alloys, KM4 and IN 100. An electron microprobe employing wavelength dispersive x-ray chemical analyses was used to characterize the chemistry along multiple grain boundaries in metallographically prepared samples of each alloy. Some degrees of boron, chromium, and cobalt enrichment of grain boundaries were observed in each alloy. Gabb, T. P. and Smith, J. W. Glenn Research Center NASA/TM-2001-210666, E-12574, NAS 1.15:210666
Author: Pacific Northwest Laboratory
Publisher:
ISBN:
Category : Grain boundaries
Languages : en
Pages :
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Author: Geoffrey Allan Chadwick
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 422
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