Metallurgical and material properties correlations between machined and severely plastic deformed aluminium alloy
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IJMF 10TH ANNIVERSARY - ADVANCES IN MATERIAL FORMING
Metallurgical and material properties correlations between machined and severely plastic deformed aluminium alloy Stano Imbrogno 1 & Domenico Umbrello 1
&
Volker Schulze 2 & Frederik Zanger 2 & Eric Segebade 2
Received: 16 February 2019 / Accepted: 9 October 2019 # Springer-Verlag France SAS, part of Springer Nature 2019
Abstract The possibility to study and clearly define the physics phenomena that occur during the machining process of various metal materials is becoming one of the interpretative keys to quantify a product’s quality and life cycle performance. An accurate understanding of the surface integrity can be achieved through the knowledge of the fundamental details about the mechanical response and the behaviour of the affected material layers caused by thermo-mechanical loads induced by machining operations. Therefore, this set of information can help the designer to produce parts with superior quality. The aim of this work is to study the surface layer states in terms of metallurgical and mechanical properties of aluminium alloy 7075 in a machined and a sereverely plastic deformed by the Equal Channel Angular Pressing (ECAP) process. The outcomes provided by the experimental measurements permitted to find possible links regarding the microstructural and hardness changes observed between the machined surface layer and the region of material deformed by ECAP. Finally, this scientific investigation aims to establish the basis for an innovative method to study and quantify the metallurgical phenomena that occur beneath the machined surface of bulk metal materials. Keywords Aluminium alloy . Severe plastic deformation . Machining . Microstructure . Hardness . X-ray diffraction
Introduction During manufacturing processes, metal materials undergo significant thermo-mechanical loads that generally induce important metallurgical changes. The latter are usually responsible for the final mechanical properties shown by the components manufactured. Taking into account the machining as well as the severe plastic deformation processes the scientific and industrial fields are making efforts to investigate the nature of the induced surface and subsurface modifications (such as dynamic recrystallization, phase transformations, dislocation density variations) and their evolutions during the manufacturing processes. Moreover, the possibility to understand the reason of the mechanical properties variations due to the metallurgical changes and to define a correlation between the * Domenico Umbrello [email protected] 1
Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, CS, Italy
2
wbk Institute of Production Science, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
surface integrity and the product’s functional performance is becoming significantly important [1]. Among the manufacturing processes, the material removal operation still represents the main process in the production of
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