Effect of ECAP on the Dimensional and Morphological Characteristics of High Performance Aluminium PM Alloy
The main aim of this paper is to show how ECAP influences the porosity distribution of PM aluminium alloys. The dimensional and morphological characteristics of investigated materials were measured individually for each pore. A commercial ready-to-press aluminium based powder (ECKA Alumix) was used as material to be investigated. After applying different compacting pressures (400 -700 MPa), specimens were debinded in a ventilated furnace (Nabertherm) at 400 ℃ for 60 min. Sintering was carried out in a vacuum furnace at 610 ℃ for 30 min. The specimens were ECAPed for 1 pass. When severe plastic deformation is applied, the stress distribution in deformed specimens causes the powder particles to squeeze together to such an extent that the initially interconnected pores transform to small isolated pores, determining a given value of the dimensional characteristics. Consequently, ECAP influences the porosity distribution in terms of the involved severe shear deformation and therefore influences the pore morphology.
Jana Bidulska Tibor Kvackaj Robert Kocisko Robert Bidulsky Marco Actis Grande
Department of Metals Forming,Faculty of Metallurgy,Technical University of Kosice,Letna 9,04200 Kosi Politecnico di Torino -Alessandria Campus,Viale T.Michel,5,15 100,Alessandria,Italy
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
535-540
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）