Manufacturing Technology 2015, 15(1):31-35 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/1/31

The Influence of High Temperature Loading on the Structure of Fine Al Powder Compacts

Ernest Gondár, Pavol Sejč, Alexander Schrek
Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava. Pionierska 15, 83102 Bratislava. Slovak Republic

Aluminum specimens for pilot resistance testing at higher temperature and mechanical loading were prepared by means of powder metallurgy. The aluminum powders with nanooxide surface layers were prepared. The tests were performed at 300°C and applied stress of 100, 125, 150, 175 MPa and at temperatures 350°C and 400°C and stress of 100 MPa. Aluminum specimens tested at 300°C and stresses of 100 and 125 MPa were characterized by very high resistance. Similar resistance was exhibited by specimens tested at 350°C and 100 MPa. The rupture of specimens tested at 350°C at 150 and 175 MPa was initiated mainly from surface defects. By aluminum tests at temperatures below 400°C, compact oxide layer was not disturbed. Oxide layer fragmentation at 400°C resulted in lower resistance of aluminum specimens. The resistance increase was accompanied by higher portion of ductile fracture with dimpled morphology. Large angle grains size was not changed. Higher temperatures and stresses cause dislocation netting on grain boundaries and initiate subgrains formation.

Keywords: aluminum powder, nanooxide layer, thermal resistance, dislocation netting

Published: February 1, 2015  Show citation

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Gondár E, Sejč P, Schrek A. The Influence of High Temperature Loading on the Structure of Fine Al Powder Compacts. Manufacturing Technology. 2015;15(1):31-35. doi: 10.21062/ujep/x.2015/a/1213-2489/MT/15/1/31.
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    References

    1. MICHNA, Š. et al. (2005). Encyklopedie hliníku, Adin - Prešov.
    2. VODĚROVÁ, M., NOVÁK, P., VOJTĚCH, D. (2013). Compacting of Aluminium Alloys Prepared by Melt Spinning Method. In: Manufactoring Technology, Vol. 13, No. 4, p. 575-580. Go to original source...
    3. PANDEY, A. B., MISHRA, R. S., PARADKAR, A. G., MAHAJAN, Y. R. (1997). Steady state creep behaviour of an Al-Al2O3 Alloy, In: Acta mater. Vol. 45, No. 3, p. 1297. Go to original source...
    4. BALOG, M. (2006). Ultra-fine grained Al profiles with high temperature stability, Dissertation theses, Bratislava, 2006.
    5. NAGY, J., SIMANČÍK, F., JERZ, J., BALOG, M., IŽDINSKÝ, K. (2005). Profiles Made by Powder Metallurgy Technology, Institute of materials and machine mechanics of the Slovak academy of sciences, Bratislava.
    6. POLETTI, P., BALOG, M., SIMANČÍK, F., DEGISHER, H. P. (2010). High temperature strength of compacted sub-micrometer aluminium powder, Acta materialia, Vol. 58, p. 3781. Go to original source...
    7. ASTM E 112 - 96, Standard Test Methods for Determining Avarage Grain Size, p. 227, 1996.
    8. VERLINDEN, B., FROYEN, L. (1994). Aluminium Powder Metallurgy, European Aluminium Association, p. 26.
    9. BALOG, M., SIMANČÍK, F., BAJANA, O., GUILLERMO, R. (2009). ECAP vs. direct extrusion - Techniques for consolidation of ultrafine Al particles, In: Materials science and engineering, A 504, 1-7. Go to original source...
    10. BALOG, M., SIMANČÍK, F., WALCHER, M., WALCHER, R., POLETTI, P. (2011). Extruded Al-Al2O3 composites formrmed in situ during consolidation of ultrafine Al powders: Effect on the powder surface area, In: Materials science and engineering, A 529, 131-137 Go to original source...
    11. SKLENIČKA, V., DVOŘÁK, SVOBODA, M. (2004). Creep in ultrafine grained aluminium, In: Materials science engineering, 2004, p. 387. Go to original source...
    12. CAVOJSKY, M., BALOG, M., DVORAK, J., ILLEKOVA, E., SVEC, P., KRIZIK, P., JANICKOVIC, D., SIMANCIK, F. (2012). Microstructure and properties of extruded rapidly sodified AlCr4,7Fe1,1Si0,3 (at) alloys, In: Materials science engineering, A 549, 223-241. Go to original source...

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