Consolidation of Al-2024 Powder by Conventional P/M Route and ECAP – A Comparative Study

Authors: Nishtha Gupta , S.Ramesh Kumar , B.Ravisankar, S.Kumaran

Abstract:

In this study, mechanically alloyed Al 2024 powder is densified by conventional sintering and by equal channel angular pressing (ECAP) with and without back pressure. The powder was encapsulated in an aluminium can for consolidation through ECAP. The properties obtained in the compacts by conventional sintering route and by ECAP are compared. The effect of conventional sintering and ECAP on consolidation behaviour of powder, microstructure, density and hardness is discussed. Room temperature back pressure aided ECAP results in nearly full denser (97% of its theoretical density) compact at room temperature. NanoIndentation technique was used to determine the modulus of the consolidated compacts.

Keywords: Al-2024, Back Pressure, ECAP, Nanoindentation

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055084

References:

[1] Z.V.Ruslan and Terence G. Langdon " Principles of equal-channel angular pressing as a processing tool for grain refinement" Progress in Materials Science, vol.51,2006, pp 881-981
[2] P.Quang, Y.G.Jeong, S.C.Yoon, S.H.Hong and H.S.Kim "Consolidation of 1 vol.% carbon nanotube reinforced metal matrix nanocomposites via equal channel angular pressing" Journal of Materials Processing Technology, 187-188,2007, pp 318-320.
[3] K.Morsi and S.Goyal "Equal channel angular pressing followed by combustion synthesis of titanium aluminides"Journal of Alloys and Compound , Vol. 429, 2006, pp L1-L4.
[4] Pham Quang, Young Gi Jeong, Seung Chae Yoon, Sun lg Hong, Soon Hyung Hong and Hyoung Seop Kim, "Carbon Nanotube Reinforced Metal Matrix Nanocomposites Via Equal channel angular pressing"Materials Science Forum, Vols. 534-536, 2007,pp 245-248
[5] Seung Chae Yoon, Sun Lg Hong , Soon Hyung Hong and Hyoung Seop Kim "Densification and Consolidation of powders by Equal channel angular pressing" Materials Science Forum, Vols. 534-536, 2007, pp.253-256
[6] S.Goussous, W.Xu, X.Wu and K.Xia " Al-C nanocomposites consolidated by back pressure equal channel angular pressing" Composites Science and Technology, Vol. 69, 2009, pp 1997-2001
[7] R.Lopovok "Damage Evolution under Severe Plastic Deformation" International Journal of fracture,vol.115, 2002, pp 159-172
[8] R.Lopovok, D.Tomus and C. Bettles " Shear Deformation with imposed hydrostatic pressure for enhanced compaction of powder" Scripta Materialia , Vol. 58, 2008, pp 898-901
[9] K.Xia and X. Wu " Back pressure equal channel angular consolidation of pure Al particles" Scripta Materialia, vol.53, 2005, pp 1225-1229
[10] W.Xu, X.WuX, T. Honma, S. P. Ringer and K. Xia " Nanostructured Al- Al2O3 composite formed in situ during consolidation of ultra fine Al particles by back pressure equal channel angular pressing" Acta Materialia , vol.57, 2009, pp 4321-4330
[11] Tiancheng Zhang and D.Y.Li "Improvement in the resistance of aluminum with yttria particles to sliding wear in air and in a corrosive medium" Wear, Vol. 251, 2001, pp 1250-1256
[12] V.M.Segal "Materials Processing by simple shear" Materials Science and Engineering A,Vol. 197, 1995, pp 157-164
[13] Balog Martin,SimanickFrantisek, Bajana Otto, Guillermo Requena "ECAP vs direct extrusionTechniques for consolidation of ultra fine Al particles" Materials Science and Engineering A,vol.504,2009,pp 1-7
[14] Ramu Yarra, P.Venkatachalam, S.Ramesh Kumar, B.Ravisankar, K.Jayasankar and P.S. Mukherjee " Densification of Al-Y2O3 composite powder by equal channel angular pressing" Transactions of Indian Institute of Metals,vol.63,2010, pp 813-817.