Paper 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.

  Info
Periodical
Materials Science Forum (Volumes 534-536)
Edited by
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
Pages
837-840
DOI
10.4028/www.scientific.net/MSF.534-536.837
Citation
C. Zubizarreta, I. Arribas, S. Giménez, I. Iturriza, "Softening-Hardening Mechanism in the Direct Hot-Extrusion of Aluminium Compacts", Materials Science Forum, Vols. 534-536, pp. 837-840, 2007
Online since
January 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Bogdan F. Palosz, Ewa Grzanka, Svetlana Stelmakh, Stanislaw Gierlotka, Roman Pielaszek, Ulrich Bismayer, H.-P. Weber, Th. Proffen, W. Palosz
203
Authors: Ewa Grzanka, Bogdan F. Palosz, Stanislaw Gierlotka, Svetlana Stelmakh, Roman Pielaszek, Ulrich Bismayer, J. Neuefeind, P. Jóvári, W. Palosz
Abstract:A considerable fraction of atoms in nanosize particles is at the grain surface (due to the small size of the crystals). We assume that the...
39
Authors: Chun Xiang Zhang, Shao Kang Guan, Hong Liang Zhao
Abstract:The effects of silicon and AlP on microstructure and properties of Mg-8Zn-4Al-0.3Mn alloy were studied. When 0.96%Si was added in the base...
197
Authors: Shi Chang Cheng, Zheng Dong Liu, Zhao Jie Lin, Han Sheng Bao
Abstract:Effect of niobium content on laminar precipitate and high temperature mechanical properties of 21-2N vavle steel was systematically studied,...
182
Authors: Gu Zhong, Zhi Bin Wu, Chu Qiu, Ya Fang Li, Hiromi Nagaumi
Chapter 2: Casting and Solidification
Abstract:In this paper, the effects of process parameters on the absorption rate of P for hypereutectic Al-Si alloy (A390) which modified with Cu-14%P...
112