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substructure

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Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000616
EISBN: 978-1-62708-181-8
... propagation until overload. 5.7×. Fig. 854 : Substructure of sample in Fig. 853 consists of dense, homogeneous dislocation tangles. Note well-defined slip bands that have sheared γ′ precipitates. TEM thin foil, 12,400×. Fig. 855 : Fracture surface of sample tested at 845 °C(1550 °F). Failure due to crack...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004019
EISBN: 978-1-62708-185-6
... microstructure during recovery become readily observable by TEM when the density of dislocations is considerably reduced and the appreciable rearrangement of the remaining dislocations has occurred. Figure 8 shows the sequence of dislocation substructure changes for a single crystal of Fe-3Si (wt%), which was...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009002
EISBN: 978-1-62708-185-6
... and (b) nearly fully recrystallized microstructure The presence of second-phase particles may affect the evolution of microstructure during hot working of both high- and low-SFE materials. In high-SFE materials, particles may affect the homogeneity and magnitude of dislocation substructure that...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005414
EISBN: 978-1-62708-196-2
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003041
EISBN: 978-1-62708-200-6
... permit part thickness to vary ±5%, fitup of joints is a problem, but it can be reduced by molding on faying surface tools. For mechanically fastened structures, the covers are frequently produced on molds having configurations that match the surface contacting the substructure (inner mold line, or IML...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004027
EISBN: 978-1-62708-185-6
... dislocation walls” or “cell block boundaries.” The orientation of these features is determined by the mode of straining and for rolling is frequently centered at 35° to the rolling plane. By ε m , the onset of a steady-state flow stress, the substructure has frequently become equiaxed ( Fig. 3b ) and remains...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004003
EISBN: 978-1-62708-185-6
... heating conditions. In the former case, the evolution of the deformation substructure in the beta phase is almost invariably accompanied by a precipitation reaction. In addition, alpha precipitation greatly retards recrystallization in beta titanium alloys. By contrast, continuous heating with no soak...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004018
EISBN: 978-1-62708-185-6
... microscopic shear bands, then macroscopic bands begin to cross the entire thickness of the sheet. Further information on dislocation substructure evolution during deformation can be found in the article “Plastic Deformation Structures” in Metalworking & Bulk Forming , Volume 14A of ASM Handbook , 2005...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
... 955 °C, but the prediction for 900 °C (32 h) is approximately twice that observed. The difference between measured and predicted times for heat treatment at 900 °C may be partially due to dislocation substructure in the beta matrix retained from prior hot working and a concomitant enhancement in...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004029
EISBN: 978-1-62708-185-6
... recrystallization textures have been reviewed, pertaining both to oriented nucleation and selective growth. With regard to oriented nucleation, the role of strain heterogeneities in the deformation substructure was analyzed in terms of their tendencies to produce nuclei of specific orientations. More particularly...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006285
EISBN: 978-1-62708-169-6
... structures. During plastic forming of metals, most of the energy input is converted to heat, but some of it (5%) is stored in the cold-worked microstructure in the form of dislocations entangled in complex substructures (most aluminum alloys) or ordered cleanly in cells, called subgrains (pure aluminum...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006284
EISBN: 978-1-62708-169-6
.... Original magnification: 750× In general, preferred nucleation sites are regions of relatively small volume where the lattice is highly distorted (having high lattice curvature). In such regions, the dimension of the substructure is fine, and the orientation gradient is high. Therefore, the critical...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009011
EISBN: 978-1-62708-185-6
..., the dislocation substructure does not change instantaneously. During the heating experiments, a lower-temperature, less highly recovered substructure is retained, giving rise to higher flow stresses than the isothermal tests. Similarly, during cooling, a softer, more highly recovered substructure...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006258
EISBN: 978-1-62708-169-6
... a cast AM60B shock tower, an extruded AM30 rail, and a warm formed AZ31 sheet component for the front end. Over 200 magnesium front-end substructures were fabricated employing friction-stir linear lap welding and laser-assisted self-pierce rivets, both with and without adhesive bonding, as shown in...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004007
EISBN: 978-1-62708-185-6
... the retention of a beneficial dislocation substructure and a change in texture of the starting material ( Ref 54 , 55 , 93 ). Both strength (hardness) and toughness were increased in the extrudate ( Ref 54 ). The strength was increased from 200 to 400 MPa (30 to 60 ksi) while toughness increased...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005431
EISBN: 978-1-62708-196-2
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005433
EISBN: 978-1-62708-196-2
... the mismatch angle between adjacent grains) and the structure of the narrow zone near the grain boundary or interface (through ω and Z , which are substructure-related terms). Perevezentsev et al. ( Ref 40 ) came up with an interesting physics-based constitutive model. They analyzed the mechanism...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003036
EISBN: 978-1-62708-200-6
... attaching a support structure ( Fig. 7 ), which is then cast, machined, or nickel-electroformed. Fig. 7 Formed sheet metal mold and attached substructure A major goal in tool design is to prevent deflection of the controlled surface. Solid molds are size limited because of handling...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009006
EISBN: 978-1-62708-185-6
...-in particles, etc.). Crystal structure, substructure, and microstructure are factors related to the ability of a metal to deform readily without the need for large stresses. Hot working, of course, allows deformation to be undertaken at relatively low stress levels. On the other hand, in some hot...
Book Chapter

By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
... established over the years to model creep deformation based on the evolution of dislocation substructures using the rates of hardening and recovery, with limited degrees of success ( Ref 6 , 7 ). The major difficultly associated with this approach is the ability to quantitatively model inhomogeneous...