Crystal Analysis of Nonequilibrium δnon-Phase in Al-Li-Mg Alloys

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The nonequilibrium δnon-phase was originally investigated in the work[1] when studying the ageing processes of the 1424 alloy ( Al-Li-Mg-system). As shown in the work[2] this phase may also be formed during the cooling from the temperature of SSHT. The δnon-phase precipitates are also present in 1420 alloy of the same system[3]. The basic structure investigations were carried out on the 1424 alloy sheets aged in accordance with the regime: 125°C, 32 hrs. The investigations were performed by TEM using the JEOL JEM 200CX microscope. The diffraction patterns from the δnon-phase on the crystallographic axes of zones close to <110>, <111>, <112> were obtained. It can be seen that the regular reflex networks appeared after the deviation from axes of zones by 3-4˚. It was established that the lattice parameters of δnon-phase and its orientation relation with the matrix can be approximately described by the following way: aδnon≈ aα/2[112] b δnon ≈a α/2[110] cδnon≈ a α [111] where aα- the period of the FCC- lattice of solid solution. The model of the crystallographic structure of the δnon-phase precipitates is proposed. On the basis of this model the mechanism of the δnon-phase formation is discussed. The late ageing stages are analyzed and it was shown that the δnon-phase particles are the nuclei for S1(Al2LiMg)- phase.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

259-264

DOI:

10.4028/www.scientific.net/MSF.519-521.259

Citation:

A.A. Alekseev et al., "Crystal Analysis of Nonequilibrium δnon-Phase in Al-Li-Mg Alloys", Materials Science Forum, Vols. 519-521, pp. 259-264, 2006

Online since:

July 2006

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$35.00

[1] Alekseev A.A., Lukina E.A., Ermolova M.I., Khokhlatova Mechanism of δ'-phase formation in Al-Li and Al-Li-Mg systems alloys; Materials Science Forum Vols. 396-402 (2002) pp.989-994.

DOI: 10.4028/www.scientific.net/msf.396-402.989

[2] Khokhlatova L.B., Alekseev A.A., Lukina E. A, Heterogeneous Precipitation in 1424 Al-Mg-Li Alloy Proc. Conf. ICAA9, 2004, Brisbane, Australia.

[3] Alekseev A.A., Setjukov O.A., Lukina E.A., Fridlyander I.N. Nature of formation the areas having an ultrafine grain structure in Al-Li-Mg system alloys, Alloy Proc. Conf. ICAA10, 2006, Vancouver, Canada, to be published.

DOI: 10.4028/0-87849-408-1.265

[4] L.F. Mondolfo: M. Metallurgy. 1979, p.639.

[5] J.N. Fridlyander, K.V. Chuistov, A. L. Beresina, N. I. Kolobnev, Alluminium - Lithium Alloys (Structure and Properties), Kiev, Ukraina, Naukova Dumka, 1992, p. p.192.

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