Strengthening mechanisms of T1 precipitates and their influence on the plasticity of an Al–Cu–Li alloy

Dorin, Thomas; Geuser, F. de; Lefebvre, W.; Sigli, Christophe; Deschamps, A.

doi:10.1016/j.msea.2014.03.024

Cited by 153 publications

(44 citation statements)

References 33 publications

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“…Confocal laser scanning microscopy (CLSM): (272). (217, 227, 229 -231, 233, 238, 239, 241, 243, 245, 247, 250, 252 -254, 256, 265, 269, 273, 283, 287, 290 -292, 300, 301, 303, 305, 311 -321, 324, 326, 327, 329, 331 -336, 339, 340, 342, 344, 345, 354, 363 -365, 371, 380, 385, 391, 393, 394, 396, 399 -401).…”

Section: Positron Annihilation Lifetime Spectroscopy (Pals) / Coincidmentioning

confidence: 99%

The Crystallography of Aluminum and Its Alloys

Nakashima

2019

Encyclopedia of Aluminum and Its Alloys

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This article begins with pure aluminum and a discussion of the form of the crystal structure and different unit cells that can be used to describe it. Measurements of the face-centered cubic lattice parameter and thermal expansion coefficient in pure aluminum are reviewed and parametrizations are given which allow the reader to evaluate them across the full range of temperatures where aluminum is a solid. A new concept called the “vacancy triangle” is introduced and demonstrated as an effective means for determining vacancy concentrations near the melting point of aluminum. The Debye–Waller factor, quantifying the thermal vibration of aluminum atoms in pure aluminum, is reviewed and parametrized over the full range of temperatures where aluminum is a solid. The nature of interatomic bonding and the history of its characterization in pure aluminum are reviewed with the unequivocal conclusion that it is purely tetrahedral in nature. The crystallography of aluminum alloys is then discussed in terms of all of the concepts covered for pure aluminum, using prominent alloy examples. The electron density domain theory of solid-state nucleation and precipitate growth is introduced and discussed as a new means of rationalizing phase transformations in alloys from a crystallographic point of view.

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Section: Positron Annihilation Lifetime Spectroscopy (Pals) / Coincidmentioning

confidence: 99%

The Crystallography of Aluminum and Its Alloys

Nakashima

2019

Encyclopedia of Aluminum and Its Alloys

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“…T 1 phase is an equilibrium phase, which shows hexagonal Àake or needle shape, about 100 nm in length, 1 nm in thickness, belonging to hexagonal (a=0.497 nm, c=0.934 nm). The T 1 is a hexagonal crystal structure with (0001) T 1 //{111} Al and (0101) T 1 //<110>Al [20].…”

Section: Methodsmentioning

confidence: 99%

In-situ Investigation of the Fracture Behaviors of 2195-T8 Aluminum-Lithium alloy

Wang

Hao

et al. 2016

MATEC Web Conf.

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Abstract. In this paper, the tensile crack initiation and propagation behavior of 2195-T8 Aluminum-Lithium alloy was studied by in situ scanning electron microscope observation at room temperature. It was found that cracks initiated at second phases which propagated along the grain boundaries only as T 1 phases could retard crack growth inside grains. With further increase of strain, within the grain a large number of slip bands were produced, resulting in the deflection of the grains, which leaded to transgranular fracture at last. SEM examination show both intergranular and transgranular fracture surface morphology indicating that the 2195-T8 alloy revealed a mix mechanism for the fracture.

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“…It is reported that geometrically necessary dislocations which are stored to accommodate the strain gradient between the deforming matrix and the non-deforming particle, drive the plastic relaxation [26]. On the other hand, the initial work hardening rates such as those found in the NA temper, have been attributed to increased strength of the dislocation junctions owing to high solute contents [10].…”

Section: Methodsmentioning

confidence: 99%

“…Recent studies of Al-Cu-Li-Mg-based alloy systems have focussed on AA2198 [9][10][11][12] which has shown an outstanding combination of static strength and damage tolerance along with good weldability and is therefore envisaged as a replacement for the AA2024/AA7475 alloys presently used in fuselage skin applications in commercial aircrafts [13,14]. Although the peak aged (PA) temper of this alloy is of application interest, detailed investigation of the structure-property relationships of other temper states is required since it provides the basis for understanding the influence of process-induced microstructural changes on the post-processing properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructural influences on strengthening in a naturally aged and overaged Al–Cu–Li–Mg based alloy

Ovri

Jägle

Stark

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tA combination of transmission electron microscopy, atom probe tomography and high-energy X-ray diffraction was employed to investigate the influence of local microstructural changes on strengthening in a commercial Al-Cu-Li-Mg based alloy, AA2198, in the stretched and naturally aged, and overaged states. Strengthening in the stretched and naturally aged temper was shown to be governed by a combination of Cu-Cu clusters, δ′/β′ phase and solution strengthening. This is in contrast to another report which suggests that strength in this temper is only due to Cu-rich clusters [B. Decreus, et al., Acta Mater., 61 (2013) 2207]. On the other hand, although large volume fractions of equilibrium phases such as T B , and θ were present in the overaged temper, its strengthening was largely governed by order hardening, which is the strengthening mechanism associated with the δ′/β′ phase. The δ′/β′ phase remained in the matrix even after extensive overaging.

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Strengthening mechanisms of T1 precipitates and their influence on the plasticity of an Al–Cu–Li alloy

Cited by 153 publications

References 33 publications

The Crystallography of Aluminum and Its Alloys

The Crystallography of Aluminum and Its Alloys

In-situ Investigation of the Fracture Behaviors of 2195-T8 Aluminum-Lithium alloy

Microstructural influences on strengthening in a naturally aged and overaged Al–Cu–Li–Mg based alloy

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