Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Softening-hardening Mechanisms in the Direct Hot-extrusion of Aluminium Compacts

  • Zubizarreta, C. (CEIT and TECNUN P Manuel de Lardizabal 15) ;
  • Arribas, I. (CEIT and TECNUN P Manuel de Lardizabal 15) ;
  • Gimenez, S. (CEIT and TECNUN P Manuel de Lardizabal 15) ;
  • Iturriza, I. (CEIT and TECNUN P Manuel de Lardizabal 15)
  • Published : 2006.09.24
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Abstract

Two different commercial aluminium powder grades have been densified by direct hot extrusion. The extrusion temperature was $425^{\circ}C$, with an extrusion ratio of 1:16. Prior to extrusion, some green compacts were pre-sintered ($500^{\circ}C$). 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. The obtained results evidence grain refinement. Additionally, inter-metallic precipitation, dynamic recovery and geometric dynamic recrystallization take place depending on some process variables, powder composition, heat treatment, strain $\ldots$

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