Déformation en compression plane et recristallisation de monocristaux d'aluminium‎

Abstract : The phenomenon of the decomposition of certain guidelines in fcc crystals rolling is studied by compression experiments on single crystals flat, in parallel with an original theoretical modeling. The heterogeneous deformation of aluminum crystal orientation (001) Kho) is associated with large crystal rotations of opposite directions around DT. The decomposition kinetics are consistent with a Taylor-type models released, while the spatial distribution of deformation bands is explained by a detailed analysis of their plastic deformation incompatibilities. To study the influence of temperature on the hot deformation of crystals, a new compression device bi-recessed flat has been developed (tmax 450c, max 1.2). Preliminary tests suggest the possibility of a stabilization of the cube orientation has around 400c temperatures. Recrystallization of deformed single crystal of aluminum mechanisms are characterized by SEM micro diffraction (EBSD and ECP). Particular attention is paid to the influence of transition -bt- bands in crystals (001) hko plane after compression. In general, two cases arise: (i) bt germination in a seed with the rotation towards the cube orientation, and (ii) sprouting in the matrix deformation bands with several types of orientation relationships (matrix, to cube or about axes <111>). The orientations of grains after complete recrystallization are also determined and disorientation characterized in terms of the type of grain boundary (method SCL)
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Abdelilah Akef. Déformation en compression plane et recristallisation de monocristaux d'aluminium‎. Sciences de l'ingénieur [physics]. Ecole National Supérieure des Mines de Saint-Etienne, 1993. Français. ⟨tel-01233124⟩

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