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| Effect of equal channel angular pressing routes on microstructure of sintered aluminum powder |
| HUA Rui, LI Ping, XUE Ke-min, SONG Qun-chao |
| （School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China） |
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Abstract Effect of equal channel angular pressing (ECAP) routes (A, BC and C route) on the microstructure and grain refinement of sintered aluminum powder was studied through optical microscope, transmission electron microscope and finite element simulation. The results show that BC route is the best one to optimize sintered aluminum powder, which refines grain size effectively, and the microstructure distribution uniformity of aluminum powder is improved. The forming of dislocation slipping can be attributed to the characteristics of crystalline structure and the relationship between the shear force during the accumulated deformation and the grains orientation. After the severe shearing of ECAP, the disorderly distribution of the initial grains shows a single orientation. When the value of adjacent shear planes angle closes to the soft orientation of metal slip system moved easily, the occurrence of dislocation slip is increased.
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Received: 18 September 2014
Published: 29 July 2015
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2015, Vol. 25 
