Déchirure ductile des tôles en alliages d'aluminium-lithium 2198 pour application aéronautique

Doctoral thesis English OPEN
Chen, Jianqiang;
(2011)
  • Publisher: HAL CCSD
  • Subject: damage | rupture ductile | mécanismes de rupture | alliage d'Al-Li | Al-Li alloys | finite element simulation | fracture mechanisms | thickness effect | effet d'épaisseur | [SPI.MAT]Engineering Sciences [physics]/Materials | anisotropie plastique | endommagement | ductile fracture | simulation par éléments finis | X-ray tomography | CZM | tomographie à rayons X | plastic anisotropy

Co-encadrement de la thèse : Yazid Madi; The purpose of this thesis consists in understanding the influence of microstructure on plastic anisotropy and fracture toughness for two grade 2198 Al-Cu-Li alloys. The sheet thicknesses are 2~mm and 6~mm. Two heat treatment con... View more
  • References (83)
    83 references, page 1 of 9

    2.1 Content of Cu and Li in the new generation Al-Cu-Li alloys (2098, 2198 and 2050), compared to second generation Al-Cu-Li alloys 2091 (Al-Li-Cu-Mg-Zr) and 2090 (Al-Cu-Li-Zr). The second generation alloy are presented as dashed boxes, the third generation as solid boxes (after Warner.,[118]). . . . . . . . . . . . . . . . . . . .

    2.2 Schematic illustration of some key property variations as a function of Cu and Li concentration in Al-Cu-Li alloys (after Warner., [118]). . . . . . . . . . . . . . . .

    2.3 Observed precipitates in different Al-Cu-Li systems according Cu and Li contents. (after Silcock., J.M., [102]) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    2.4 Schematic of precipitates and dispersoids that contribute to strength and toughness in 2099 and 2199 Al-Cu-Li alloys (after Giummarra et al., [39]). . . . . . . . . . .

    2.5 TEM micrograph of Zr containing dispersoid particles (a) and Mn containing dispersoid particles (b). The figure (a) refers to an Al-4.8Cu-0.45Mg-0.39Ag-0.14Zr alloy and the figure (b) refers to an Al-4.9Cu-0.46Mg-0.38Ag-0.32Mn alloy (after Cho et Be`s, [26]). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    2.6 TEM micrograph of Al-2.3Li-1.8Mg-0.15Zr-0.1Cu alloy associated with a clear PFZ. (after O¨ zbilen., [79]). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    2.7 Two different heat treatment sequences applied to each grade (recrystallized sheet and fibrous sheet). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    2.8 Definition of L (rolling direction), T (long-transverse direction), S (short-transverse direction) and D (diagonal direction) of the sheet material in this study. . . . . . .

    2.9 Optical micrographs of the AA2198-T3 2 mm-thick recrystallized material in TS, LS, LT planes and pseudo-3D grain structure. (L: rolling direction, T: long transverse direction and S: short transverse direction). . . . . . . . . . . . . . . . . . .

    2.10 Optical micrographs of the AA2198-T3 6 mm-thick fibrous material in TS, LS, LT planes and pseudo-3D grain structure. (L: rolling direction, T: long transverse direction and S: short transverse direction). . . . . . . . . . . . . . . . . . . . . .

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