Microscopic and macroscopic aspects of fracture in lithium-containing aluminum alloys

Suresh, S.; Tosten, M.H.; Howell, P. R.

doi:10.1016/0001-6160(87)90210-0

Cited by 145 publications

(26 citation statements)

References 26 publications

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“…Vasudevan and colleagues [6][7][8][9] have published several studies which conclude that the grain boundary particles are responsible for the relative weakness of the boundaries.…”

Section: Introductionmentioning

confidence: 99%

Microtexture and nanoindentation study of delamination cracking in Al-Cu-Li-X alloys

Crooks

Domack

Wagner

2006

WIT Transactions on the Built Environment, Vol 85

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Commercial Al-Li alloys have strength and weight advantages over non-Al-Li alloys. The fracture behavior of these alloys is unusual and has limited their use. The fracture mode, described as delamination, is intergranular, along the broad grain boundaries parallel to the rolling plane of the plate. Microtexture analyses have shown that delaminations occur along boundaries with greater than 30º misorientation. However, it was observed that relatively few of the high angle boundaries exhibited this behavior. Some grains of the retained deformation texture show high internal misorientation, which is a measure of stored strain energy. Delamination tends to occur between these grains and adjacent, recrystallized grains. Nanoindentation studies indicate a higher hardness for the high internal misorientation grains. These results suggest that the delamination

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“…Vasudevan and colleagues [6][7][8][9] have published several studies which conclude that the grain boundary particles are responsible for the relative weakness of the boundaries.…”

Section: Introductionmentioning

confidence: 99%

Microtexture and nanoindentation study of delamination cracking in Al-Cu-Li-X alloys

Crooks

Domack

Wagner

2006

WIT Transactions on the Built Environment, Vol 85

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“…Once this happens, shear is localized and accumulates at the grain boundaries by trailing dislocations gliding in the same slip plane, resulting in grain boundary fractures. Low fracture toughness has also been associated with the embrittlement of the grain boundaries [8], and the existence of stress raisers, such as coarse constituents in grains [4]. The development of A1-Li alloys with higher toughness, therefore, could involve a prevention of the formation of coarse planar slip in grains and the resulting strain localization at grain boundaries [9].…”

Section: Introductionmentioning

confidence: 99%

Toughness and microstructural parameters in thermomechanically processed 2091 Al-Li alloy

Kobayashi

Kim

1999

Metals and Materials

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The effect of microstructural features on the toughness of 2091 A1-Li alloys processed with various thermomechanical schemes was analyzed. Grain size and the distribution of precipitates were varied by thermomechanical processing. Dynamic fracture toughness tests were done to evaluate the toughness of these materials using a Computer Aided Instrumented testing system. The 6' (A13Li) and S' (AI,CuMg) precipitates, which are primary strengthening precipitates, were confirmed by TEM analysis in the under-aged 2091 AILi alloy. From analysis of the relation between toughness and the microstructural lhctors induced by thermomechanical processing, the toughening of the alloy was found to be associated with the refinement of the subgrains. The strength and toughness parameters were well related to subgrain size.

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“…Crack deflection and/or branching were found to occur in a variety of materials during quasi-static fracture [7,8], fatigue crack growth [8][9][10][11][12][13][14] and stress corrosion cracking [15,16]. The crack branching and its effect on the initiation as well as propagation toughness in A1-Li alloys has been analyzed by Suresh and co-workers [7,17,18]. The crack path morphologies in their studies, restricted to plane strain conditions, were modelled treating them as symmetrically branched cracks.…”

Section: Introductionmentioning

confidence: 99%

“…The crack path morphologies in their studies, restricted to plane strain conditions, were modelled treating them as symmetrically branched cracks. These investigations point to significant improvement in the crack propagation toughness due to crack branching [18]. On the other hand, studies pertaining to crack path deflection or meandering in A1-Li alloy sheet products during R-curve evaluation are limited [19,20].…”

Section: Introductionmentioning

confidence: 99%

Effect of crack deflection and branching on the R-curve behaviour of an Al-Li alloy 2090 sheet

1993

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The methodology to predict the increase in crack growth resistance due to crack deflection and branching is described. These procedures are discussed with respect to an AI-Li alloy 2090 sheet in T6 condition, the R-curve tests on which revealed that the crack path in L T orientation was deflected and branched while it remained nominally straight in TL orientation. The resistance to slow stable crack extension in L-T orientation was found to be significantly higher as compared to that in T-L orientation. Such behaviour is rationalized in terms of crack deflection and branching. The observed variation in the crack path morphology and the resulting R-curves in L-T and T-L orientations can be understood in terms of the microstructural features of the alloy.

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Microscopic and macroscopic aspects of fracture in lithium-containing aluminum alloys

Cited by 145 publications

References 26 publications

Microtexture and nanoindentation study of delamination cracking in Al-Cu-Li-X alloys

Microtexture and nanoindentation study of delamination cracking in Al-Cu-Li-X alloys

Toughness and microstructural parameters in thermomechanically processed 2091 Al-Li alloy

Effect of crack deflection and branching on the R-curve behaviour of an Al-Li alloy 2090 sheet

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