Potential of the KOBO extrusion process for nonferrous metals in the form of solids and chips

The research undertaken for this paper was inspired by the results of theoretical analyzes and strong experimental evidence confirming the possibility to induce the phenomenon of viscous flow (typical for liquids) in the process of low-temperature KOBO extrusion of metals. Thus, despite the constant solid state of the metal, the KOBO plastic deformation process requires much lower stress (low flow resistance) in comparison with conventional extrusion. On the other hand, the KOBO method is particularly attractive due to the generation of high strength properties in the product/extrudate favorable for low (room) temperature deformation as well as superplastic features at higher temperature ranges.This paper presents the results of the studies on the efficiency of low-temperature KOBO extrusion of hardly-deformable materials in massive form (Mg4Li, AK11, Cu6.5P) and fragmented fractions (2014, 7075, AZ91, titanium grade 2). Particular attention was paid to the structure and mechanical properties of the obtained extrudates, which were rated as exceedingly favorable. As such, the paper provides new technological arguments for the application of the KOBO method in plastic deformation of materials as it guarantees their functional properties.

Automated summary

The research in this paper was inspired by theoretical analysis and strong experimental evidence that proved the possibility of inducing viscous flow (typical for liquids) in low-temperature KOBO extrusion of metals. The KOBO plastic deformation process requires lower stress compared to conventional extrusion, while also generating high strength properties and superplastic features at different temperature ranges. The paper presents the results of studying the efficiency of low-temperature KOBO extrusion on hardly-deformable materials, both in massive form and fragmented fractions. The structure and mechanical properties of the obtained extrudates were found to be exceedingly favorable, providing new technological arguments for the application of the KOBO method in plastic deformation of materials.