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.
[1]赵新, 高聿为, 南云等.制备块体纳米超细晶材料的大塑性变形技术[J].材料导报, 2003, 17(12):5-8
[2]IWAHASHI Y, WANG J T, HORITA Z J, et al.Principle of equal-channel angular pressing for the processing of ultra-fine grained materials[J].Scripta Materialia, 1996, 35(2):143-146
[3]胥广亮, 陈国清, 周文龙等.等径角挤压对AZ31镁合金组织及力学性能的影响[J].材料工程, 2011, (2):69-72
[4]XIA K, WU X, HONMA T, et al.Ultrafine pure aluminum through back pressure equal channel angular consolidation (BP-ECAC) of particles[J].Journal of Materials Science, 2007, 42(5):1551-1560
[5]李萍, 王晓溪, 薛克敏等.纯铝粉末材料单道次等径角挤扭变形的微观组织[J].中国有色金属学报, 2013, 23(10):2779-2784
[6]REIHANIAN M, EBRAHIMI R, TSUJI N, et al.Analysis of the mechanical properties and deformation behavior of nanostructured commercially pure Al processed by equal channel angular pressing (ECAP)[J].Materials Science and Engineering A, 2008, 473:189-194
[7]KAWASAKI M, HORITA Z, LANGDON T G.Microstructural evolution in high purity aluminum processed by ECAP [J].Materials Science and Engineering A, 2009, 524:143-150
[8]STOLYAROV V V, ZHU Y T, ALEXANDROV I V, et al.Influence of ECAP routes on the microstructure and properties of pure Ti[J].Materials Science and Engineering A, 2001, 299:59-67
[9]PAN Z, GUO Y Z, MATHAUDHU S N, et al.Quasi-Static and dynamic mechanical properties of commercial-purity tungsten processed by ECAE at low temperatures [J].J Mater Sci, 2008, 43:7379-7384
[10]ZHU Y T, LOWE T C.Observations and issues on mechanisms of grain refinement during ECAP process [J].Materials Science and Engineering A, 2000, 291:46-53
[11]吴世丁, 安祥海, 韩卫忠等.等通道转角挤压过程中金属的微观结构演化与力学性能[J].金属学报, 2010, 46(3):257-276
[12]EIVANI A R, TAHERI A K.Effective strain based on shear and principal strains in equal channel angular extrusion with outer curved corner [J].Computational Materials Science, 2008, 41:409-419
[13]王晓溪.纯铝粉末等径角挤扭工艺数值模拟及实验研究[D]. 合肥: 合肥工业大学, 2012.
[14]FURUKAWA M, HORITA Z, NEMOTO M, et al.Processing of metals by equal- channel angular pressing[J].Journal of Materials Science, 2001, 36: 2835-2843., 2001, 36:2835-2843
[15]崔忠圻, 覃耀春.金属学与热处理[M]. 北京：机械工业出版社, 2007.5.
2015, Vol. 25 
