@inproceedings{279e94e817e647e98c2cd85ccc12aecb,
title = "Softening-hardening mechanism in the direct hot-extrusion of aluminium compacts",
abstract = "Powder compacts from two different commercial aluminium powder grades have been densified by direct hot extrusion. The extrusion runs have been carried out at 425°C, with an extrusion ratio of 1:16 and a ram speed of 1.5 mm/s. Prior to extrusion, some green compacts were presintered (500°C). The evolution of the extrusion load during the process and the hardness of the final products have been investigated. Additionally, microstructural characterization by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Electron Backscattered Diffraction (EBSD) was carried out in order to understand the softening-hardnening mechanisms taking place during the process. The obtained results evidence grain refinement. Additionally, inter-metallic precipitation, dynamic recovery and geometric dynamic recrystallization take place depending on the composition of the powder, the heat treatment before extrusion and the strain involved in the process.",
keywords = "Aluminium powder, EBSD, Hot-extrusion, Recovery, Recrystallization",
author = "C. Zubizarreta and I. Arribas and S. Gim{\'e}nez and I. Iturriza",
year = "2007",
doi = "10.4028/0-87849-419-7.837",
language = "English",
isbn = "0878494197",
series = "Materials Science Forum",
publisher = "Trans Tech Publications Ltd",
number = "PART 1",
pages = "837--840",
booktitle = "Progress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)",
edition = "PART 1",
note = "2006 Powder Metallurgy World Congress and Exhibition, PM 2006 ; Conference date: 24-09-2006 Through 28-09-2006",
}