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Investigation of warm compaction and sintering behaviour of aluminium alloys

Simchi, A ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1179/003258903225005321
  3. Publisher: IOM Communications Ltd , 2003
  4. Abstract:
  5. The effects of warm compaction on the green density and sintering behaviour of aluminium alloys were investigated. Particular attention is paid to prealloyed powders, i.e. eutectic and hypereutectic Al-Si alloys, regarding their potential applications in the automotive industry. The effects of chemical composition, alloying method, compacting temperature and the amount of powder lubricant were studied. The compaction behaviour was examined by an instrumented die enabling simultaneous measurement of density, die wall friction coefficient, the triaxial stresses acting on the powder during the course of compaction and ejection pressure. The sintering behaviour was studied via dilatometeric analysis as well as normal batch sintering. The results show that warm compaction could be a promising way to increase the green density of aluminium alloys, especially prealloyed powders, and to decrease dimensional instability during sintering. Moreover, it reduces the sliding friction coefficient and the ejection force during the powder shaping process. This paper presents the significant advantages and drawbacks of using the warm compaction process for commercial PM aluminium alloys. © 2003 IoM Communications Ltd. Published by Maney for the Institute of Materials, Minerals and Mining
  6. Keywords:
  7. Automotive industry ; Sintering ; Silicon alloys ; Powder metals ; Friction ; Compaction
  8. Source: Powder Metallurgy ; Volume 46, Issue 2 , 2003 , Pages 159-164 ; 00325899 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1179/003258903225005321