The formation of dislocation networks

Miekk-oja, H. M.; Lindroos, V.K.

doi:10.1016/0039-6028(72)90270-1

Cited by 21 publications

(5 citation statements)

References 13 publications

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“…With an increase in strain rate, the yield point disappeared and the degree of strain softening after the peak stress increased. The presence of the yield drop at high temperatures and low strain rates and the disappearance of the yield drop with decreasing temperature and increasing strain rate agrees with previous work performed on alloy 718 [19,20]. These studies attributed the development of the yield point to precipitates or carbides on dislocations or stacking faults as well as to short range ordering.…”

supporting

confidence: 90%

The Hot Deformation Behavior of an As-Cast Alloy 718 Ingot

Weis¹,

Mataya²,

Thompson³

et al. 1989

Superalloys 718 Metallurgy and Applications (1989)

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supporting

confidence: 90%

The Hot Deformation Behavior of an As-Cast Alloy 718 Ingot

Weis¹,

Mataya²,

Thompson³

et al. 1989

Superalloys 718 Metallurgy and Applications (1989)

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“…In addition, the recrystallization texture of cold rolled high purity Al sheet is predominantly cube orientation ({100}<001>). In commercial pure Al, in addition to cube orientation, R-fiber ({123}<634>) has been observed [25,26]. For Al alloys, in addition to cube orientation, other components, such as gross ({101}<010>), brass ({101}<121>), copper ({112}<111>) and P ({011}<122>) have also been reported upon annealing [28,29].…”

Section: Resultsmentioning

confidence: 99%

“…In fact, it has been reported that the recovery in Al takes place at a relatively higher rate. A model on dislocation knitting has been put forward by Lindroos and Miekk-oja [26,27] shown schematically in Fig. 9(a).…”

Section: Resultsmentioning

confidence: 99%

Fatigue mediated lattice rotation in Al alloys

2017

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A significant lattice rotation in the plastic zone of a fatigue crack at room temperature in highly oriented Al 1100 and Al 7075 alloys has been observed by employing X-ray diffraction (XRD) and transmission electron microscopy (TEM). The intensity of 111 peak gradually increases as compared to the intensity of 200 peak as we approach the crack, suggesting lattice rotation. The texture was seen to change gradually from the cubic, away from the crack, to a more random orientation close to the crack. We ascribe the lattice rotation to the increase in dislocation density in the plastic zone. The estimated average angle of rotation is approximately 11°, which is sufficient to disturb the cube texture close to the crack. In addition, the observed plastic zone, as estimated by the lattice rotation, is order of magnitude higher as compared to the theoretically predicted plastic zone. This is of great importance, as it leads to a new insight of the underlying physics of the deformation process in the plastic zone under cyclic loading.

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“…Dislocation networks were observed within the grains (Figure 12(a)) as a result of interaction of the dislocation forests, glide dislocations, and dislocation climb. [15] Glide dislocations are pushed by the applied shear stress against the dislocation forests. In addition, dislocation pileups were observed at grain boundaries (Figure 12(b)) as a result of deformation, that produce high stress regions on the grain boundary b phase.…”

Section: Methodsmentioning

confidence: 99%

Microstructural Evolution and Stress Corrosion Cracking Behavior of Al-5083

Goswami

Σπανός

Pao

et al. 2010

Metall Mater Trans A

112

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The fine scale microstructure of Al-5083 (H-131) sensitized at 448 K (175°C) for 1, 10, 25, 50, 100, 240, 500, and 1000 hours has been investigated using transmission electron microscopy (TEM) to study the evolution of the b phase (Al 3 Mg 2 ) at grain boundaries and on pre-existing intragranular particles. In fully sensitized Al-5083, the b phase (Al 3 Mg 2 ) forms heterogeneously both at grain boundaries and on pre-existing particles, which are enriched in manganese. TEM observations showed that the grain boundary precipitation of the b phase initially occurs between 0 to 1 hour of aging at 448 K (175°C), and that the b phase grows with a ribbonlike morphology. The grain boundary planes are covered by the b phase after 240 hours of aging. The contribution of microstructure, defects, and environment on the stress corrosion cracking (SCC) behavior is discussed.

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The formation of dislocation networks

Cited by 21 publications

References 13 publications

The Hot Deformation Behavior of an As-Cast Alloy 718 Ingot

The Hot Deformation Behavior of an As-Cast Alloy 718 Ingot

Fatigue mediated lattice rotation in Al alloys

Microstructural Evolution and Stress Corrosion Cracking Behavior of Al-5083

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