期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 726, 期 -, 页码 367-377出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.08.018
关键词
Aluminum alloy; High speed machining; Grain refinement; Precipitation; Texture
资金
- Aviation Scientific Fund of China [2016ZE53046]
- Natural Science Foundation of China [51501022]
- fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201402]
- 111 Project of China [B08040]
- 973 Program of China [6138502]
The high speed machining induced surface deformation layer in a 7055 aluminum alloy was investigated by means of transmission electron microscopy (TEM) and precession electron diffraction (PED) assisted nanoscale orientation mapping. The gradient nanostructures were composed of equiaxed and lamellar nanograins and ultrafine grains decorated by coarse grain boundary precipitates (GBPs). The presence of low angle dislocation boundaries, the recrystallized nanograins and ultrafine grains showed direct evidence that dislocation activities and dynamic recrystallization are two dominant grain refinement approaches, while the large size and density differences between GBPs and grain interior precipitates (GIPs) unraveled a prominent precipitate redistribution, which can be accomplished via the thermally and mechanically induced precipitate dissolution, solute diffusion and reprecipitation. The quantitative prediction of solute diffusion in the current machining condition agreed well with the TEM observation results. The crystallographic texture of the surface nanostructured layer was proved to be a mixture of brass, cube and weak rotated cube, the severe but diversified thermomechanical effect of high strain, high strain rate and high temperature shear deformation during high speed machining is responsible for texture development. (C) 2017 Elsevier B.V. All rights reserved.
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