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dislocation theory

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 May 2018
DOI: 10.31399/asm.tb.hma.t59250047
EISBN: 978-1-62708-287-7
... Abstract This chapter covers the early studies and various discoveries by metals researchers to study the internal structure of metals. The topics covered include light microscopy, phase diagrams, X-ray diffraction, principles of precipitation hardening, and dislocation theory...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870375
EISBN: 978-1-62708-344-7
... of dislocation theory, heat treatment processes and procedures, important engineering materials and strengthening mechanisms, and the nature of elastic, plastic, and creep strain components. It also provides information on mechanical property and fatigue testing, the use of hysteresis energy to analyze fatigue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870237
EISBN: 978-1-62708-344-7
... and mechanisms involved in fatigue. It begins with a review of some of the early theories of fatigue and the tools subsequently used to obtain a better understanding of the fatigue process. It then explains how plasticity plays a major role in creating dislocations, breaking up grains into subgrains, and causing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410017
EISBN: 978-1-62708-265-5
... – 87 3.26 Hull D. and Bacon D.J. , Introduction to Dislocations , 3rd ed. , Pergamon Press , Oxford , 1984 3.27 Weertman J. and Weertman J.R. , Elementary Dislocation Theory , Oxford University Press , 1992 3.28 Hirth J.P. and Lothe J...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... , Chalmers B. Christian J.W. and Massalski T.B. , Ed., Pergamon , New York , 1975 1.9 Nabarro F.R.N. , Ed., Theory of Crystal Dislocations , Dover Publications, Inc. , New York , 1980 1.10 Poirier J.P. , Creep of Crystals , Cambridge University Press, second...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410213
EISBN: 978-1-62708-265-5
... and Structures.” Therefore, at room temperature, microstructures of equiaxed grains of ferrite have high ductility: dislocations can readily move and multiply to produce large permanent changes in the shape of steel structures. However, below room temperature, dislocation movement is restricted and ferritic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540357
EISBN: 978-1-62708-309-6
... thus allows deformation within a crystalline lattice of metals at relatively lower stresses in the range of 35 kPa (5 psi) for unalloyed metals to 345 MPa (50 ksi) for high-strength structural alloys. The theory of dislocations can provide an understanding of slip deformation in metals below 0.4 T M...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870001
EISBN: 978-1-62708-344-7
... in Chapter 10 . The role of plasticity in agglomerating microscopic imperfections into larger flaws, with associated stress concentrations, is discussed using dislocation theory. Most engineers are familiar with dislocations, but for those who need the basics, or who prefer to refresh their background...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240041
EISBN: 978-1-62708-251-8
... theory is that carbon and nitrogen atoms diffuse to the cores of dislocations and form atmospheres that lock the dislocations in place. During the horizontal serrated portion of the stress-strain curve, these dislocations are progressively torn away from their atmospheres. An alternative theory...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410063
EISBN: 978-1-62708-265-5
... of the surrounding parent phase, however, cause the martensite unit to accommodate or deform by a lattice invariant deformation to the original boundaries (a) as required by the crystallographic theory. Figures 5.12(c) and (d) show, respectively, the martensite deformed by slip (dislocation movement) or twinning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860237
EISBN: 978-1-62708-348-5
.... (1967) . Theory of Crystal Dislocations . Clarendon, Oxford, England . Nachtigall A. J. (1975) . Strain-cycling fatigue behavior of ten structural materials tested at liquid helium, liquid nitrogen, and ambient air. In Properties of Materials for Liquefied Natural Gas Tankage . ASTM STP...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410405
EISBN: 978-1-62708-265-5
... martensite with increasing carbon content is related to increasing dislocation densities and increased transition carbide densities with carbon content as described previously. According to the work-hardening theory of Kuhlmann-Wilsdorf ( Ref 18.29 ), the stresses necessary to generate new segments of glide...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... assisting the diffusion of atoms. The number of dislocations is reduced when the vacancies diffuse to grain boundaries or surfaces, which act as sinks. If a metal is heated to a high temperature, the number of vacancies increases. If it is then suddenly quenched to room temperature, the vacancies...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060013
EISBN: 978-1-62708-261-7
..., in northwestern Germany. The name “Duralumin” for the new alloy presumably resulted from contracting the words “Durener” and “aluminum.” For the next 13 years and without the benefit of theory, metallurgists put the new alloy to use. The mystery was solved in 1919 in the United States by a team...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420339
EISBN: 978-1-62708-310-2
... Abstract This chapter discusses the basic principles of precipitation hardening, an important strengthening mechanism in nonferrous alloys as well as stainless steel. It begins with a detailed review of the theory of precipitation hardening, then describes its application to aluminum alloys...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
... Abstract Hydrogen damage is a form of environmentally assisted failure that results most often from the combined action of hydrogen and residual or applied tensile stress. This chapter classifies the various forms of hydrogen damage, summarizes the various theories that seek to explain hydrogen...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420171
EISBN: 978-1-62708-310-2
... from the formation of FeAl (arrow) and the small APBs within the large FeAl domains from the transformation to Fe 3 Al. Source: Ref 9.7 as published in Ref 9.3 Dislocation-Generated Antiphase Boundaries Although APBs were previously defined as the boundary between two ordered domains...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420363
EISBN: 978-1-62708-310-2
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700023
EISBN: 978-1-62708-279-2
... and the distorted lattice is resistant to dislocation glide and hence increases its strength and hardness. Transformation to martensite occurs at temperatures below 250 °C, and the percentage of transformation depends only on the temperature to which it is cooled. Transformation to martensite occurs...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030021
EISBN: 978-1-62708-418-5
... composition diffusion mechanisms dislocation slip elastic properties face-centered-cubic high-entropy alloys stacking faults strengthening methods twinning Question 1: What Are High-Entropy Alloys? Answer Based on the composition of the alloys, Yeh et al. ( Ref 1 ) first proposed...