多相合金的ECAP挤压路径优化设计

Design and Optimization of ECAP Routes for Multi-phase Alloys

利用BC路径组织细化效率高、BA路径颗粒均匀再分散效果好的特点,设计了4BA+4BC路径组合,考察了其相比于BC、BA路径对Al-Mg2Si双相合金组织与力学性能的影响。结果表明,4BA+4BC组合路径由于前期4道次BA路径挤压良好的颗粒再分散能力,促进了后续4道次BC路径挤压材料的组织细化效率提高和大角度晶界的快速形成,材料的综合力学性能较其它两种路径得到显著改善。

In view of high efficiency of microstructural refinement in route G： and remarkable particle redistri- bution in route Ba, a new combined route 4BA＋4Bc was designed and employed to process a A1 Mg2Si dual phase al- loy to investigate its effect on the microstructure and mechanical property of the alloy by comparation with routes Bc and BA, respectively. The results show that processing by route 4BA ＋4Bc results in higher comprehensive mechanical property compared to those by the other two routes due to significant particle redistribution caused by route BA during the first 4-pass processing and the resultant promoted microstructure refining efficiency and rapid formation of high- angle grain boundary by route G- during the last 4-pass processing.