Download or read book Grain Boundary Chemistry and Intergranular Fracture written by G. Was and published by Trans Tech Publications Ltd. This book was released on 1991-01-01 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Science Forum Vol. 46

Download or read book The Role of Grain Boundary Chemistry and the Environment on Intergranular Fracture written by R. M. Latanision and published by . This book was released on 1980 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this discussion the influence of grain boundary segregates and their interaction with the environment will be discussed with particular reference to hydrogen-induced intergranular embrittlement. Many of the elements which are found segregated at grain boundaries (i.e., the metalloid elements) are catalyst poisons for the hydrogen evolution reaction in electrolytes and, hence, stimulate hydrogen absorption. The use of glassy metal alloys (transition metal-metalloid type) as grain boundary analogs in studying hydrogen absorption and permeation is explored. Likewise, permeation experiments which distinguish between lattice, grain boundary and dislocation transport mechanisms will be discussed. (Author).

Download or read book Grain Boundary Chemistry and Intergranular Fracture written by Gary Steven Was and published by . This book was released on 1989 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Science Forum Vol. 46.

Download or read book Grain Boundary Segregation in Metals written by Pavel Lejcek and published by Springer Science & Business Media. This book was released on 2010-07-20 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Effects of Grain boundary Chemistry on Fracture Mechanisms in Highly Pure Si3N4 Ceramics written by Alexander Ziegler and published by . This book was released on 2001 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grain boundary segregation and intergranular fracture in molybdenum written by A. Kumar and published by . This book was released on 1979 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemistry and Physics of Fracture written by R.M. Latanision and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many years it has been recognized that engineering materials that are-tough and ductile can be rendered susceptible to premature fracture through their reaction with the environment. Over 100 years ago, Reynolds associated hydrogen with detrimental effects on the ductility of iron. The "season cracking" of brass has been a known problem for dec ades, but the mechanisms for this stress-corrosion process are only today being elucidated. In more recent times, the mechanical properties of most engineering materials have been shown to be adversely affected by hydrogen embrittlement or stress-corrosion cracking. Early studies of environmental effects on crack growth attempted to identify a unified theory to explain the crack growth behavior of groups of materials in a variety of environments. It is currently understood that there are numerous stress-corrosion processes some of which may be common to several materials, but that the crack growth behavior of a given material is dependent on microstructure, microchemistry, mechanics, surface chemistry, and solution chemistry. Although the mechanism by which various chemical species in the environment may cause cracks to propagate in some materials but not in others is very complex, the net result of all environmentally induced fracture is the reduction in the force and energy associated with the tensile or shear separation of atoms at the crack tip.

Download or read book Grain Boundary Composition and Intergranular Fracture of Steels Detection of grain boundary segregation in steels written by and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grain Boundary Composition and Intergranular Fracture of Steels written by Pacific Northwest Laboratory and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grain Boundary Segregation of Impurities in Metals and Intergranular Brittle Fracture written by John R Low (Jr) and published by . This book was released on 1969 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Grain Boundaries and Crystalline Plasticity written by Louisette Priester and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this book is to put forward the fundamental role of grain boundaries in the plasticity of crystalline materials. To understand this role requires a multi-scale approach to plasticity: starting from the atomic description of a grain boundary and its defects, moving on to the elemental interaction processes between dislocations and grain boundaries, and finally showing how the microscopic phenomena influence the macroscopic behaviors and constitutive laws. It involves bringing together physical, chemical and mechanical studies. The investigated properties are: deformation at low and high temperature, creep, fatigue and rupture.

Download or read book Chemistry Bonding and Properties of Grain Boundaries in L12 Intermetallic Compounds written by Shanthi Subramanian and published by . This book was released on 1997 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Grain Boundary Segregation Relating to Intergranular Fracture written by Harris L. Marcus and published by . This book was released on 1975 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Grain Boundary Chemistry Effects on Environment induced Crack Growth of Iron based Alloys written by and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Relation between grain boundary chemistry and environment-induced crack growth of Fe-based alloys is reviewed. The importance of the cleanliness of steels is clearly demonstrated by direct relations between grain boundary chemistry and crack growth behavior for both H and anodic dissolution-induced crack growth. Relationships between strain to failure, work of fracture, K{sub ISCC}, crack velocity and fracture mode and grain boundary chemistry are presented. Only results in which the grain boundary chemistry has been measured directly by Auger electron spectroscopy (AES) on intergranular surfaces exposed by in situ fracture have been considered in this review.

Download or read book Grain Boundary Segregation and Intergranular Failure written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Intergranular and Interphase Boundaries in Materials Iib92 written by Ph Komninou and published by . This book was released on 1993 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: The review and research papers presented in this volume may be subdivided into three aims:

Download or read book The Role of Grain Boundary Chemistry and Structure in the Environmentally assisted Intergranular Cracking of Nickel base Alloys Progress Report December 1 1990 November 31 1993 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress focused on (1) determination of the role of C and Cr on deformation and IG cracking behavior of Ni-(5--30)Cr-9Fe, (2) determination of the effect of grain boundary misorientation on IG cracking behavior, (3) construction of an electron backscattering pattern (EBSP) imaging system, (4) determination of effect of the environment on creep and cracking, and (5) characterization of the surface film. Results showed that both C and Cr are potent solid solution strengtheners which can reduce the steady state creep rate at 360[degree]C by several orders of magnitude. Intergranular cracking of 100 [mu]m grain samples of high purity Ni-16Cr-9Fe at 360[degree]C occurs by formation of grain boundary voids and interlinkage, driven by dislocation creep in the matrix. Creep experiments in primary water at 360[degree]C and an applied cathodic potential show that the creep rate is increased by an order of magnitude over that in Ar and the percent IG fracture increases as well. Oxide film composition and thickness is a sensitive function of the C content, increasing in thickness and Ni(OH)[sub 2] content with increase in C or decrease in Cr to 5 wt%. Thermomechanical treatments along with electron channeling pattern (ECP) analysis wee used to create and index, samples with enhanced fractions of coincident site lattice boundaries (CSLBs). Constant extension rate tensile (CERT) experiments on samples with a high percentage of CSLBs showed IG cracking compared with general high angle boundaries. However, these experiments were conducted on grain sizes of 300 [mu]m, while commercial material is an order of magnitude smaller. An electron backscattering pattern imaging system has been constructed for an environmental scanning electron microscope which can image grains below [mu]m. The system has been successfully benchmarked against results from ECP analysis.