An investigation on the transformation of the decagonal phase to a B2 phase in Al–Cu–Co alloy during mechanical milling

Mukhopadhyay, N K and Murthy, G V S (2002) An investigation on the transformation of the decagonal phase to a B2 phase in Al–Cu–Co alloy during mechanical milling. Journal of Alloys and Compounds, 342 (1-2). pp. 38-41.

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Abstract

Al65Cu20Co15 decagonal phase, synthesized by a slow cooling technique, were mechanically milled in a high energy planetary ball mill for 10, 20 and 30 h. X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques were used for characterization of phases. The phase transformation from the decagonal phase to a B2-crystalline phase (ordered CsCl type phase) during mechanical milling is reported here for the first time. Powders milled for more than 10 h contained predominantly the B2 type crystalline phase with a lattice parameter of 0.29 nm. This crystalline phase was found to be quite stable after 30 h of milling and also on subsequent annealing at 600 °C. These experimental results lend support to an earlier suggestion that the decagonal phase in Al–Cu–Co is actually less stable than the B2 phase at low temperatures.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/S0925-8388(02)00129-9
Uncontrolled Keywords:Decagonal quasicrystals; B2 phase; Nanocrystals; Al–Cu–Co alloy; Mechanical milling; Ballistic diffusion
Divisions:Material Science and Technology
ID Code:541
Deposited By:Sahu A K
Deposited On:18 May 2010 11:49
Last Modified:25 Jan 2012 11:29
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