Controlled grain size distribution and refinement of an EN AW-6082 aluminium alloy

Abstract

An EN AW-6082 aluminium alloy was subjected to an incremental deformation by a new process named gradation rolling. The process is used to generate a grain size distribution in a rod shaped billet. A gradient of the grain size from coarse grained to ultrafine grained size is obtained by gradation rolling. The microstructure shows an increasing grain refinement related to the true strain. This results in strain-hardening and grain-boundary strengthening in the surface region (130 HV0.5). as compared to the unchanged core (110 HV0.5)

Microstructural Evolution during Severe Plastic Deformation by Gradation Extrusion

“…There are, furthermore, many techniques of surface coating which are applicable for almost every material, but are often accompanied by the formation of substrate-coating interfaces that can be disadvantageous for certain applications. For tailoring specific gradient microstructures and mechanical properties, SPD methods have rarely been used [23][24][25][26]. In the present work, a distinct microstructural gradient is created by a heterogeneous introduction of severe plastic deformation.…”