Formation of ultrafine grained in solution treated Al-6061 by twodimensionalmachining

Imposition of large plastic strain in bulk materials is a well-known method for promoting formation of ultra-fine grained and nanocrystalline microstructures. Generation of large plastic strain by machining is a method of severe plastic deformation. In this study, Characteristics of chips produced by large strain deformation of solution treated Al-6061 has been analysed. By varying the geometry of the tool, different levels of strain were imposed in the chip in a single pass of machining. The microstructure generated in produced chips was characterized by transmission electron microscopy as equiaxed and nano-sized grains. In addition micro hardness tests showed significant increase of chip hardness in comparison to the bulk of solution treated Al-6061.

Keywords:

ultrafine grains , Two-dimensional machining , solution treated Al-6061