Bera, Supriya and Ghosh Chowdhury, S and Estrin , Yuri and Manna, I (2013) Mechanical properties of Al7075 alloy with nano-ceramic oxide dispersion synthesized by mechanical milling and consolidated by equal channel angular pressing. Journal of Alloys and Compounds, 548 (IF-2.390). pp. 257-265.
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An Al-alloy matrix composite with a dispersion of nano-TiO2 has been sysnthesized in powder form b mechanical milling of pre-alloyed Al7075 alloy and nano-TiO2 powder blend. XRD and Tem analyses of the milled powder confirm the particle/crystallite size in nanometer range. The composite powder was consolidated by equal channel angular pressing (ECAP) at ambient temperature and 473 K at speed of 5mm/min. Microstructural analysis of consolidated compacts compacts of Al7075 alloy with nano-TiO2 dispers-ion was carried out using both scanning and transmission electron microscopy. The compacts prepared by ECAP possess reasonably good density (90% of theoretical density), excellent hardness (3.72 GPa/344 VHN) and high stiffness (Young’s modulus of 92 GPa). Furthermore, the compacts cons-olidated by 4 ECAP passes at 473 K exhibit, beside the highest density, an extremely high compressive stren-gth (1.7 GPa). Conspicuously the above properties are independent of structural orientation as texture analysis shows almost random texture even after ECAP consolidation.
|Uncontrolled Keywords:||Electron microscopy; mechanical milling; fracture toughness|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||04 Mar 2013 13:21|
|Last Modified:||27 Feb 2014 11:52|
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