通过背散射电子衍射(EBSD)研究Al?8Zn和Al?6Bi?8Zn两种合金经5道次室温等径角挤压(ECAP)过程中的组织演变和晶粒细化行为.经过5道次等径角挤压,两种合金都形成了超细晶粒.然而,Al?6Bi?8Zn合金的晶粒明显小于Al?8Zn合金,这说明在等径角挤压过程中铋粒子对晶粒细化有明显的作用.通过测定等径角挤压后两种合金的硬度发现,经5道次等径角挤压之后,Al?6Bi?8Zn合金的硬度高于Al?8Zn合金.此外,讨论了铋粒子在等径角挤压过程中对变形行为及最终合金强度的影响.
Two aluminum alloys, Al?8Zn and Al?6Bi?8Zn were subjected to equal channel angular pressing (ECAP) up to 5 passes at room temperature. The microstructural evolution and the grain refinement behavior of these alloys were systematically studied by electron backscatter diffraction (EBSD). After 5 passes of ECAP, ultrafine grained microstructures formed in both alloys. However, the grain structure in the Al?6Bi?8Zn alloy is much finer than that of Al?8Zn alloy, showing that the soft Bi particles have a strong influence on enhancing the grain refinement during ECAP. The strengths of the ECAP-processed materials were measured by hardness test and it showed that after 5 passes of ECAP, the hardness of the Al?6Bi?8Zn alloy was higher than that of the Al?8Zn alloy. The effects of soft Bi particles on the deformation behavior during ECAP and the final strength of the Al?6Bi?8Zn alloy were discussed.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%