Al-Zn-Mg-Cu合金銑削表面變形層的微觀組織和織構(gòu)
[Abstract]:The microstructure and texture of the surface deformation layer of milling Al-Zn-Mg-Cu alloy were studied by means of transmission electron microscopy (TEM) technique and a complete set of precession electron diffraction (PED) technique. The results show that the surface deformation layer is composed of the topmost equiaxed nanocrystalline / ultrafine crystal layer and the layered nanocrystalline / ultrafine crystal layer in the subsurface layer. The existence of the nanocrystalline / ultrafine crystal, which is the most superficial recrystallization of (GBPs); precipitated phase at the grain boundary, indicates that in addition to dislocation movement, dynamic recrystallization also plays a role in the grain refinement process, and compared with the original coarse grain, dynamic recrystallization also plays an important role in the grain refinement process. The obvious difference in the size and density of GBPs and precipitated phase (GIPs) in the deformed layer of machined surface is due to the redistribution of precipitated phase induced by thermo-mechanical action. The texture types of the surface deformation layer are mixed texture consisting of near-copper texture {112} 111, rotating cubic texture {001} 110 and F-type texture {111} 112. The main reason for the formation of these textures is the severe shear deformation of the surface introduced during milling.
【作者單位】: 西北工業(yè)大學(xué)材料學(xué)院;
【基金】:973項(xiàng)目資助
【分類(lèi)號(hào)】:TG146.21;TG54
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