大应变切削加工制备纳米材料方法的探究

Research on preparing nanostructured materials by plain machining in severe plastic deformation

控制切削参数使变形区域的金属发生较大变形,拉长晶粒,从而获得亚微米及纳米级结构的切屑材料。该方法突破了现有方法的限制,不仅可以在一道工序中获得硬度从低到中高的纳米金属和合金材料,而且可以通过改变工艺参数方便地对纳米材料微观结构成形机理进行系统的研究,是一种可以低成本大批量制备各种纳米材料的有效方法。

A new method of preparing nanostructured metals and alloys is introduced based on characteristic analysis of several SPD methods. With the method of plain machining, nano- and ultra-fine grained structure and dynamic recrystallization have been demonstrated in a variety of materials by varying the controllable machining parameters. This demonstration not only suggests a low-cost and large-batch method for making nanocrystalline materials ,but also a novel experimental technique for studying microstructure mechanics at the microand nanoscale.