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dislocation mobility

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.t56020013
EISBN: 978-1-62708-389-8
... of twinning planes on stacking sequences. The chapter also includes problems on how the formation of precipitates can produce slip planes and how grain boundaries can act as obstacles to dislocation motion. dislocation mobility edge dislocations glide plane grain boundaries miscibility pinning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060115
EISBN: 978-1-62708-355-3
... representation of dislocations on a slip plane Dislocation mobility is dependent on the alloy content, the extent of cold work, the size, shape, and distribution of inclusions and second phase particles, and the grain size of the alloy. The strength of most metals increases as alloy content increases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.9781627083898
EISBN: 978-1-62708-389-8
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.t56020001
EISBN: 978-1-62708-389-8
... of such impurities in reducing dislocation mobility and hence materials strength. For example, introduction of 0.1 atom % molybdenum (a substitutional impurity) into bcc iron results in a 2.6 MPa increase in yield strength compared with 79 MPa for carbon (an interstitial impurity). Upon application of a shear...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... tensile load at elevated temperature will creep and undergo a time-dependent increase in length. Since the mobility of atoms increases with increasing temperature, diffusion-controlled mechanisms become active. Dislocation mobility increases, slip becomes easier, new slip systems become available...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410213
EISBN: 978-1-62708-265-5
... to remove all carbon and nitrogen from interstitial solid solution and thereby eliminate potential interstitial-atom-dislocation interactions, as described in the following section. Thus, the changes in deformation behavior could be directly attributed only to changes in bcc dislocation mobility. At high...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230131
EISBN: 978-1-62708-298-3
... transformation from NbBe 12 to Nb 2 Be 17 (the latter structure is very closely related to the former) and could account for enhanced dislocation mobility and the promotion of high-temperature deformation. Atomistic modeling has been performed for the a[100] edge and screw dislocations, and the a/2[100] screw...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
.... 11 Thermally activated dislocation climb. Source: Ref 3 Fig. 12 Diffusion creep mechanisms. Source: Ref 3 Fig. 20 Logarithmic plot of stress-rupture stress versus rupture life for Co-Cr-Ni-base alloy S-590. The significance of inflection points A, B, N, O, and Y is explained...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410113
EISBN: 978-1-62708-265-5
... diffusion of carbon atoms require high temperatures. At intermediate temperatures, while interstitial carbon atoms still have good mobility, the movement of iron atoms is severely retarded, and either very short-range rearrangement at ferrite-austenite ledges or shear mechanisms are required to form non...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240117
EISBN: 978-1-62708-251-8
... impurities and alloying elements are attracted to both vacancies and dislocations, their presence decreases the mobility of the defects. One of the key processes of dislocation rearrangement is polygonization. Polygonization is the process of rearranging excess edge dislocations into low-angle tilt...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410405
EISBN: 978-1-62708-265-5
... dislocations, but eventually this source of mobile dislocations is exhausted. Fig. 18.9 Residual screw dislocation (linear features) substructure in martensite of a 0.14% C steel tensile tested at 150 °C (300 °F) at a strain rate of 8.3 × 10 −4 sec −1 . Source: Ref 18.5 When the screw...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... Point defects: A, interstitial atom; B, vacancy; C, foreign atom in lattice site Fig. 7 Section through an edge dislocation (indicated by the symbol ⊥) with an axis perpendicular to the plane of the illustration and line dislocation. (a) Positive edge dislocation, (b) negative edge dislocation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
..., ionic bond). A characteristic of this metallic bond is the ease of movement of the outer electrons, which are no longer attached to individual atoms but form an electron gas. This mobility of the electrons is the reason for the good electrical conductivity of metals. Nonmetallic crystalline...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060013
EISBN: 978-1-62708-261-7
... Gold 50–75 Copper 80–90 Nickel 130–200 Aluminum 200–250 Fig. 2.15 Line dislocation movement. The top illustrates the analogy of moving a rug with progression of a wrinkle. Source: Ref 2.2 Fig. 2.24 Illustration of the generation of either a face-centered cubic (fcc...
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
... nonetheless. The reason that carbon is such a potent hardener of iron is that it dissolves interstitially in the bcc lattice, producing a tetragonal distortion. The resulting internal stress interacts strongly with moving dislocations, substantially reducing their mobility. This is discussed in much greater...
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 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310027
EISBN: 978-1-62708-286-0
... interstitial solution and the amount it can trap at lattice defects ( Ref 39 ), especially the dislocations within the plastic zone at the crack tip, which provide enhanced hydrogen solubility where it can aggravate the applied crack opening with a wedge effect from hydrogen dilation. Just like SCC...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090067
EISBN: 978-1-62708-266-2
... with cleavage fracture and plasticity should favor ductile fracture. However, enhanced plasticity, which has been observed to result from increased screw-dislocation mobility caused by the influence of hydrogen, is not general ( Ref 3.17 ). Hardening effects due to hydrogen are also observed ( Ref 3.17...
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
... to dislocations; solid-solution effects Hydride precipitation T , temperature. Source: Ref 1 Intermetallic compounds embrittled by moisture or hydrogen at ambient temperature Table 3 Intermetallic compounds embrittled by moisture or hydrogen at ambient temperature Alloy Agent Crystal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... and traveling into emitting area. Fig 9 EBIC image (top view) shows gradual degradation near the facet as darkening along the right and left ends of the stripe (after [4] ). Fig 10 Plan-view (i.e., top-view) TEM of a ❬100❭ DLD growing out of a threading dislocation. Threading dislocation...