Hardenability of aluminum-lithium alloys

Shneider, G. L.; Drits, A. M.

doi:10.1007/bf01156813

Cited by 10 publications

(12 citation statements)

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“…At the same time a recent study [6] has shown that if the proportions of Cu/Li and Cu/Mg in the AI-Li-Cu-Mg system are chosen correctly, the stability of the supersaturated solid solution can be increased substantially and the critical quenching rate can be diminished to 0.5 K/sec. The mechanical properties of the alloys remain at a high level [7].…”

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Stability of supersaturated solid solution of aluminum — Lithium alloy 1470

Shneider

1998

Met Sci Heat Treat

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The prospects of the use of aluminum -lithium alloys in the aircraft industry are due to their diminished density and high rigidity as compared to the similar properties of alloys without lithium. This makes it possible to diminish considerably the mass of the structure, which greatly influences the fuel and weight efficiency of the product. The demand for such alloys in aircraft engineering grows steadily. The pioneer alloys of this kind belonged to the AI -Mg -Li system, then came AI -Cu -Li alloys. With the recent creation of alloys in the AI -Li -Cu -Mg system the application range of the alloys has widened substantially. Their main disadvantages include the low adaptability to manufacture and the tendency to embrittlement in the process of long-term operation at a temperature much above room temperature, for example, in solar heating. The present paper is devoted to the special features of the decomposition of the supersaturated solid solution in a new promising alloy 1470 (AI -Li -Mg -Cu) and the nature of the phases formed. The obtained results have been used for developing practical recommendations for the choice of regimes for reinforcing heat treatment of semiproducts from alloy 1470.AI -Cu -Li alloys have been developed in Russia to replace the high-strength alloy V95 (AI-Zn-Mg-Cu), and AI-Li-Cu-Mg alloys have been designed for replacing the DI6 alloy (AI-Cu-Mg) used for the production of some aircraft parts.Though the spectrum of problems solved with the help of aluminum -lithium alloys is quite wide and the data on the results of research in the field both in this country and abroad are quite ample, the level of knowledge of these materials remains insufficient for their correct choice and application.The recent tendency consists in using the alloys in the form of various semiproducts with allowing for the stability of the solid solution and the hardenability. For example, alloys of the AI -Mg -Li system are used successfully for the creation of large-size, predominantly welded, heavy-duty elements of structures produced from forged preforms. Alloys of the AI -Cu -Li system are used successfully in the form of pressed profiles, panels, and rolled plates connected predominantly by bolts. Alloys of the AI -Li -Cu -Mg system arc quite suitable for skinning and reinforcing elements in riveted structures in the form of thin-wall pressed profiles and rolled sheets.This demarcation of the application ranges of aluminum -lithium alloys in accordance with the kinds of semiproduct is understandable in terms of the available data on the stability of the supersaturated solid solution.

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confidence: 96%

Stability of supersaturated solid solution of aluminum — Lithium alloy 1470

Shneider

1998

Met Sci Heat Treat

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“…In alloy 1933 an increase in the cooling rate in quenching causes an increase in CSr, whereas in alloy 1420 ~scr diminishes. The fall of %r with the growth of the cooling rate in quenching is a feature of all aluminum-lithium alloys [8,9]. The volume fraction of corrosion fracture of alloy 1420 with the growth of the cooling rate in quenching increases, and the volume fraction of static fracture diminishes (Fig.…”

Section: Results and Their Discussionmentioning

confidence: 99%

“…The values ofo c , c' subcritical and supercritical ranges of the cooling rates are lower than at Vcool = Vcr, i.e., the growth of the fatigue crack net diminishes. In is decelerated and the residual strength o c order to decrease the capacity of aluminum alloys for delayed fracture and increase the level of the static and cyclic crack resistance, the ranges of the cooling rates in quenching have been specified [8,9,20]. In practice this is provided by optimizing the cooling conditions in quenching.…”

Section: Results and Their Discussionmentioning

confidence: 99%

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Delayed fracture of aluminum alloys

1999

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“…For this reason, the stability of the solid solution in the low-temperature range is higher for alloy 1451 (1.6% Li) than for alloy 1450 (2.3% Li). At the same time, since the Cu/Li proportion increases, the stability of the solid solution in the high-temperature range decreases [21]; therefore vcr of alloy 1451 should be higher than that of alloy 1450. It should be noted that when the lithium content in the alloy is decreased to 1.0-1.7%, the volume fraction 8'/O' of composite particles increases, and they diminish the degree of lithium supersaturation of the solid solution Iike the 8-phase.…”

Section: Phase Transformations In Continuous Cooling Of Commercial Sementioning

confidence: 96%

Hardenability of aluminum-lithium alloys

Cited by 10 publications

References 1 publication

Stability of supersaturated solid solution of aluminum — Lithium alloy 1470

Stability of supersaturated solid solution of aluminum — Lithium alloy 1470

Delayed fracture of aluminum alloys

Decomposition of the solid solution in commercial semiproducts from aluminum alloys

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