چكيده به لاتين
Multi-crystalline materials with nano-metallic and ultrafine grained structure has excellent mechanical properties in comparison to conventional multi-crystalline metals. Therefore, many efforts, in the last 20 years, to metal production of ultrafine grained microstructure and nano have been done which they are known as Severe Plastic Deformation (SPD) methods. In these methods, plastic severe strain is applied on the material and finally reduces the size of segments. Despite the need to use high-strength tubes in different industries, a limited number of severe plastic deformation processes have been introduced for the tubes. In this regard, methods for producing ultra-fine and nano tubes and microstructure with proportion of strength to the weight are presented. The Parallel tubular channel angular pressing (PTCAP) is one of the suitable processes for the production of ultrafine tubes. Severe plastic deformation methods are limited to producing ultrafine grained thin-walled tubes and no process has been introduced for producing them. It is restricted since with reduced thickness, deformation force increases the frictional force and a lot of Momentum is spent on overcoming the friction. In this study, ultrafine grained and nanostructured aluminum alloy tubes 5083 has been produced with parallel tubular channel angular pressing process and also the effect of the number of cycles on microstructure, mechanical properties, fracture behavior, and mechanical anisotropy of these tubs has been studied and finally PTCAP process has been simulated through finite element method.
Keywords: Ultrafine Tubes, Severe Pastic Deformation, Parallel Tubular Channel Angular Pressing, Finite Element Method
